RFPA

制造商：Mechsoft Technology (USA) Co., LLC
Realistic Failure Process Analysis (RFPA) software is a numerical test tool developed based on RFPA method (real fracture process analysis method) that can simulate the progressive failure of materials.

The simulation is based on the finite element theory and statistical damage theory, which takes into account the heterogeneity of material properties and the randomness of defect distribution, and combines this statistical distribution assumption of material properties into a numerical calculation method (finite element method). The failure processing is performed on the unit that meets the given strength criterion, so that the numerical simulation of the failure process of non-uniform materials can be realized, which can solve the problems that most simulation software cannot solve in geotechnical engineering.

Percolation analysis version–RFPA3D-Flow

3D real rupture process analysis software [seepage analysis version]-RFPA-Flow is a new version following the RFPA3D-Basic version. RFPA3D-Flow can establish a physical model describing the seepage-stress-damage coupling of heterogeneous rock masses, and can study the effects of changes in the stress state of the rock mass and the evolution of permeability during the damage process on the seepage process, including stress-strain -Analysis of the whole process of permeability coefficient, the law of permeability change during crack initiation and propagation; the influence of seepage process on rock stress distribution and damage evolution under water pressure, including the effect of pore water pressure on rock failure mode; The influence of the seepage-stress-damage coupling mechanism of rocks, etc .; this version can be used to simulate the basic seepage characteristics of rocks (body), and also to carry out numerical calculation and analysis of rock (body) fluid-solid coupling problems in hydraulic engineering. For example, calculation and analysis of various dam body seepage fields, pore pressure fields, and micro-temporal spatiotemporal distribution in hydraulic and hydropower projects can be carried out, and prediction and analysis of sudden geological hazards such as water inrush in confined water and coal seam mining projects.

Parallel analysis version– RFPA3D -Parallel

Three-dimensional realistic failure process analysis software [Parallel analysis version]-RFPA3D-Parallel was launched after the successful development of RFPA stand-alone series software. Major scientific discoveries made through large-scale scientific calculations have been generally agreed upon. From traditional science and engineering fields such as aerospace, earthquake forecasting, weather and climate forecasting, large-scale water conservancy construction and petroleum geological exploration, to emerging scientific research fields such as large-scale genome testing, new drug design, and new material synthesis, no large-scale numerical values are needed everywhere. Experiments and scientific calculations. In today’s society, scientific numerical experiments have gradually become a key link that affects and affects a country’s economic development, scientific and technological progress, and national security. To achieve large-scale numerical experiments and scientific calculations, we must first seek better algorithms and technologies to solve large-scale calculation problems from science and various engineering technologies, and increase the speed of calculation. Parallel computing methods are currently solving this problem. One of the most proven methods. The same is true for engineering geological hazards. Due to the many factors involved and the complexity and scale of the problem, it is difficult to carry out high-level analysis and forecasting based on existing numerical calculation methods and analysis tools. The use of large-scale scientific computing techniques to analyze the distribution of complex stress fields and the analysis and forecast of disasters will undoubtedly be an effective way. The RFPA3D-Parallel version was launched in response to this demand. The RFPA3D-Parallel version combines modern parallel computing technology and RFPA series software-specific failure process analysis methods, which can establish large-scale three-dimensional geological models of actual engineering, achieving more than 3 million Unit, the numerical calculation and analysis of stress over 300 billion times per second, to analyze the evolution of stress field, displacement field and microseismic activity, to provide a research platform for engineering safety and stability evaluation, geological hazard prediction and prediction.

Engineering Modeling Edition–RFPA3D-Engineering

3D realistic failure process analysis software [Engineering Modeling Edition]-RFPA3D-Engineering was launched after the successful development of RFPA3D-Basic Edition. It is mainly for the analysis of practical geotechnical engineering applications. It can perform stress analysis, displacement monitoring and acoustic analysis of engineering entities. Emission (microseismic) monitoring, etc. For the actual engineering model, RFPA3D-Engineering itself can be used for modeling and calculation analysis, or large-scale general commercial software such as MSC.PATRAN, ANSYS can be used for modeling, and then imported into RFPA3D-Engineering for calculation and analysis. Finally, the visual results and specific quantitative analyze data.

Strength reduction version–RFPA3D-SRM

Three-dimensional realistic failure process analysis software [strength reduction version]-RFPA3D-SRM is a new version of the RFPA2D series software that introduces the basic principles of strength reduction into the real fracture process analysis [RFPA] method. This version can be used to analyze the stability of slopes and geotechnical engineering. The numerical calculation methods of this version fully meet the requirements of static permission, strain compatibility, and nonlinear stress-strain relationship of geotechnical soils. Assuming the specific position and shape of the sliding surface, there is no need to divide it, and the program can automatically find the sliding surface. During the simulation process, it is possible to track the slope initiation, crack development and the formation of the sliding surface. The maximum number of element failures is used as a criterion for slope instability. The method is simple and effective; it can perform stability analysis on rock and soil slopes with complex geology, geomorphology, and is not limited by the slope geometry and structure. The structural planes with different structures, occurrences and characteristics in the slope can be reproduced in the numerical model, which can provide theoretical support for further study of slope stability and provide guidance for slope design.

3D Basic version RFPA3D-Basic

3D realistic failure process analysis Software [Basic Version]-RFPA3D-Basic is a new version developed on the basis of the ideas of RFPA2D series software. The complexity of mathematical theory, laboratory test and field observation test conditions and technical limitations have brought great difficulties to the study of three-dimensional rock fracture process. The RFPA3D series software is launched in response to this demand. RFPA3D The series of software inherits the characteristics of the RFPA2D series of software in the analysis of rock and soil fracture processes. It can realize the loading and fracture of rock specimens, acoustic emission of rock fractures, three-dimensional crack propagation and interaction, numerical simulation of composite fractures, and can analyze The application of structural engineering damage, concrete structure damage and other practical projects. The calculation result is a rich three-dimensional graphic display. SGL’s cross-platform powerful graphics library module OpenGL is used to display the graphic images of the software simulation results. The model can be rotated at multiple angles and cut in different directions to observe the emergence of the calculated and analyzed entities Spatiotemporal distribution of cracks, stress fields, displacement fields, and acoustic emission fields.

Engineering Modeling Edition–RFPA2D-Engineering

2D realistic failure process analysis software [Engineering Modeling Edition]-RFPA2D-Engineering is a new version based on RFPA2D-Basic. Adhering to the characteristics of RFPA series software in the analysis of rock and soil rupture process, it is mainly oriented to the actual analysis of geotechnical engineering applications. It can perform stress analysis, displacement monitoring and acoustic emission (microseismic) monitoring of engineering entities. For the actual engineering model, you can use RFPA2D-Engineering itself for modeling and calculation analysis. You can also use MSC.PATRAN, ANSYS and other large general commercial software for modeling. Then import it into RFPA2D-Engineering for calculation and analysis. Finally, you can get visual results and specific quantitative analyze data.

Meso-analysis version–RFPA2D-DIP

Two-dimensional realistic failure process analysis software [Meso-analysis version]-RFPA2D-DIP (2D realistic failure process analysis based Digital Image Processing)

It is a new version introduced on the basis of RFPA2D-Basic to introduce digital image processing technology to characterize the microstructure of heterogeneous materials such as rocks and concrete. Digital images of rock or concrete sample sections are imported, and digital image processing technology is used to analyze the color characteristics of the images, identify various types of mesoscopic media, and assign corresponding material numbers to determine the material area of each mesoscopic media. The software automatically converts the processed non-uniform characterization image into a finite element mesh, so as to establish a numerical model that reflects the meso-structure of the material. Use the software’s fast and convenient material assignment function to assign values to the meso-media materials and input the meso-media materials The construction equation controls parameter values. Set the boundary conditions, that is, to analyze the mechanical behavior and failure process under the external load. This version is mainly aimed at the rock formed by a variety of different colors of rock-forming minerals and concrete materials with obvious gray scale differentiation. It can also be used to analyze composite materials. (The current image processing algorithm is only for the 24-bit BMP image common to Windows. It can be used to analyze the effect of the mesostructure of the material on the mechanical behavior and its damage and destruction process, as a useful auxiliary research means for the corresponding experimental results. Because this version is based on The digital image is modeled, so the accuracy of the numerical model mainly depends on the resolution of the imported digital image and the color characteristics of the image, that is, the meso-structure information of the material that the digital image can reflect.)

Centrifuge loaded version–RFPA2D-Centrifugal

Two-dimensional realistic failure process analysis software [centrifugal loading version]-RFPA2D-Centrifugal is a new version based on RFPA2D-Basic, which introduces the basic principles of centrifugal loading test into the real rupture process analysis [RFPA] method. RFPA2D-Centrifugal is based on the understanding of the meso-level structure of the rock, assuming that the meso-mechanical properties of the rock are statistical, discretizing the rock into meso-scale primitives of an appropriate scale, considering its non-uniformity characteristics, and according to the given Weibull statistical distribution Function to assign the mechanical properties of these elements. These mesoscopic primitives can use the finite element method as a stress analysis tool to calculate the displacements and stresses under load. On this basis, through the analysis of elementary damage, it is investigated whether the elementary material is destroyed, and a new state of the material properties of the elementary material is obtained. RFPA2D-Centrifugal gradually increases the self-weight of the mesoscopic primitives in a linear relationship with a certain step size. With each increase, the finite element calculation program will perform iterative calculations to find the balance between external and internal forces, and perform damage analysis until the slope is macro. Instability failure, the sliding failure surface of the numerical model is obtained to obtain the calculation step of the maximum number of failure elements as the critical point of slope instability, and the corresponding safety factor is calculated.

Strength reduction version–RFPA2D-SRM

Two-dimensional realistic failure process analysis software [strength reduction version]-RFPA2D-SRM is a new version of RFPA2D-Basic, which introduces the basic principle of strength reduction into the real fracture process analysis [RFPA] method. This version can be used to analyze the stability of slopes and geotechnical engineering. The numerical calculation methods of this version fully meet the requirements of static permission, strain compatibility, and nonlinear stress-strain relationship of geotechnical soils. Assuming the specific position and shape of the sliding surface, there is no need to divide it, and the program can automatically find the sliding surface. During the simulation process, it is possible to track the slope initiation, crack development and the formation of the sliding surface. The maximum number of element failures is used as a criterion for slope instability. The method is simple and effective; it can perform stability analysis on rock and soil slopes with complex geology, geomorphology, and is not limited by the slope geometry and structure. The structural planes with different structures, occurrences and characteristics in the slope can be reproduced in the numerical model, which can provide theoretical support for further study of slope stability and provide guidance for slope design.

Strength reduction is to gradually reduce the strength parameters (including shear and tensile strength) of rock or soil in the finite element calculation until it reaches the failure state. The program can automatically obtain the failure surface (zone of sudden change in strain) according to the calculation results, and also obtain the safety factor of the strength reserve.

RFPA2D-SRM is based on the understanding of the meso-level structure of rocks. It is assumed that the meso-mechanical properties of rocks are statistical. First, the rocks are discretized into meso-scale primitives of appropriate scale. The uniformity characteristics are assigned to the mechanical properties of these elements according to the given Weibull statistical distribution function, so that a numerical model of non-uniform geotechnical structure is generated. These mesoscopic primitives can use the finite element method as a stress analysis tool to calculate the displacements and stresses under load. On this basis, through the analysis of elementary damage, it is investigated whether the elementary material is destroyed, and a new state of the material properties of the elementary material is obtained. RFPA2D-SRM gradually reduces the strength of the mesoscopic primitives in a linear relationship with a certain step size. With each reduction, the stress analysis program will perform iterative calculations to find the balance between external and internal forces, and perform a damage analysis based on this. , Until the macroscopic instability of the slope is destroyed, and the sliding failure surface of the slope is obtained.

In addition, in the past, the strength reduction method mainly considered the shear failure criterion in the model, but rarely considered the influence of tensile failure. However, in practical problems, tensile failure is also an important factor inducing slope instability and must be considered in the model. Therefore, RFPA2D-SRM’s meso-constitutive model introduces the shear strength criterion while introducing the tensile failure criterion. It tries to use both shear and tensile criteria to judge the meso-rock failure, and then obtains Results of rock and soil structure stability analysis.

Creep Analysis Edition–RFPA2D-Creep

2D realistic failure process analysis [Creep Analysis Version]-RFPA2D-Creep is a new version following RFPA2D-Basic. The numerical test is mainly applied to the fracture process of materials and engineering structures under the action of creep. RFPA2D-Creep is based on the deterioration of the physical and mechanical properties of rock materials over time and the accumulation of meso-damage in the rock. Based on the meso-elastic damage model, a degradation equation of meso-element mechanical properties is introduced to reveal the cumulative damage and The relationship between deformation localization and overall accelerated creep provides a new method for the study of macroscopic creep failure of rocks from the meso-damage evolution process.

RFPA2D-Creep’s meso-damage creep model is based on the elastic damage constitutive relationship, and considers that the meso-non-uniformity is the root cause of the macroscopic non-linearity of the rock. The non-uniformity of the rock material is considered using the constitutive relationship of statistical damage. The randomness of the properties and defect distribution, and the statistical distribution assumption of this material property is incorporated into numerical calculation methods (such as the finite element method). On the meso-structure, the rock material is regarded as consisting of quadrilateral elements of the same size, and the elements constituting the material are also used as the elements of the finite element analysis. The elements that meet the given strength criteria are destroyed to make the non-uniform rock materials. Numerical simulation of the failure process was realized. Considering the non-uniformity of the mechanical properties of materials, a simple meso-structure model is used to study the complex material failure process.

Calculation examples

Acoustic emission characteristics during creep failure
Creep failure process of rock samples under uniaxial constant load (RFPA2D-Creep simulation)
Creep failure process and stress field distribution of underground roadway (RFPA2D-Creep simulation)

Dynamic Analysis Edition–RFPA2D-Dynamic

Two-dimensional realistic failure process analysis software [Dynamic Analysis Edition]-RFPA2D-Dynamics is a dynamic analysis program developed by the author based on the RFPA static version to analyze the rock fracture process. The program can take a stress wave or initial velocity as input and perform stepwise analysis in time steps. At each time step, the influence of mass and acceleration on the mechanical balance must be considered. Stress analysis is performed using an elastic dynamic finite element program, and the maximum tensile stress criterion and Mohr’s Coulomb criterion are used to determine whether the element is damaged or not. Impact).

Gas analysis version–RFPA2D-Gasflow

Two-dimensional realistic failure process analysis software [gas analysis version]-RFPA2D-Gasflow is a new version following the RFPA2D-Basic version, also known as “gas coal rock fracture process analysis system”. It is mainly used for numerical simulation test research in the fracture process of gas-bearing coal and rock, including the basic mechanical properties of coal and rock samples (uniaxial compression, bidirectional compression, uniaxial tensile, biaxial tensile, shear test, creep test). , Loading and unloading tests, etc.) and basic seepage properties tests; numerical simulation tests of gas-bearing coal and rock outburst processes (Shimen outburst, uphill overhang, and delayed lag out, etc.); and permeability evolution during gas-bearing coal-rock failure Numerical simulation test and gas drainage prevention and control coal and gas outburst numerical simulation test. The numerical calculation results can visually and visually show the evolution of the stress field, gas flow field, and the spatiotemporal distribution of acoustic emission during the fracture process of gas-bearing coal and rock.

Calculation examples

Stress field evolution of coal and gas outburst induced by Shimen Tunneling (RFPA2D-Gasflow simulation)
Mining-induced breakage migration process and gas pressure distribution around gas drainage holes in coal seams (RFPA2D-Gasflow simulation)

Gas pressure variation process of gas seepage under drainage (RFPA2D-Gasflow simulation)

Temperature Analysis Edition–RFPA2D-Thermal
[Two-dimensional realistic failure process analysis software] [Temperature Analysis Version]-RFPA2D-Thermal is a new version following the RFPA2D-Basic version. With this version, the deformation and failure tests of rocks, concrete, and composite materials under hot loads can be widely carried out. The thermal load in actual engineering can also be numerically analyzed. The calculation and analysis can intuitively obtain the temperature field in experiments and engineering entities, Spatiotemporal evolution of stress field, displacement field and acoustic emission (microseismic) field.

Percolation analysis version–RFPA2D-Flow

Two-dimensional realistic failure process analysis software [seepage analysis version]-RFPA2D-Flow is a new version following the RFPA2D-Basic version. RFPA2D-Flow can establish a physical model describing the seepage-stress-damage coupling of heterogeneous rock masses, and can study the effects of changes in the stress state of the rock mass and the evolution of permeability during the damage process, including stress-strain -Analysis of the whole process of permeability coefficient, the law of permeability change during the process of crack initiation and propagation; the effect of seepage process on the stress distribution and damage evolution of rocks under water pressure, including the effect of pore water pressure on rock failure modes; The influence of the seepage-stress-damage coupling mechanism of rocks, etc .; this version can be used to simulate the basic seepage characteristics of rocks (body), and also to perform numerical calculation and analysis of rock (body) fluid-solid coupling problems in hydraulics. For example, calculation and analysis of various dam body seepage fields, pore pressure fields, and micro-seismic spatiotemporal distribution in hydraulic and hydropower projects can be performed to predict and predict sudden geological hazards such as water inrush in confined water and coal seam mining projects.

Strata Analysis Edition–RFPA2D-Strata

Analysis software for 2D realistic failure process analysis [Rock formation analysis version]-RFPA2D-Strata was introduced after RFPA2D-Basic version, and is mainly for application analysis of geotechnical engineering. The new version of RFPA2D-Basic introduces the loose coefficient, which realizes the simulation and reproduction of the collapse of the falling rock mass, making the simulation of rock movement (collapse) more realistic. Using this version, real-time monitoring of stress fields, displacement fields, and acoustic emission patterns (microseisms) can be carried out for engineering disasters such as ground subsidence, rock movement, roadway damage, and roof fall induced by underground engineering. Such as: (1) simulation analysis of rock movement laws induced by mining; (2) calculation simulation analysis of ground subsidence induced by underground engineering construction; (3) calculation simulation analysis of deformation and failure process of tunnel groups.

2D Basic version–RFPA2D-Basic

2D realistic failure process analysis [Basic Version]-RFPA2D-Basic is the most basic version of RFPA2D series software, which concentrates the basic functions of RFPA2D series software, including pre-processing modeling module, finite element calculation, post-processing analysis Independent module. It can meet the basic experimental teaching of basic rock mechanics. It can analyze the deformation and failure of brittle materials such as rock and concrete under load, detect its acoustic emission mode, and perform simple engineering application analysis, such as underground engineering excavation and support processes. Monitoring of stress field, displacement field and acoustic emission (microseismic) monitoring.