Discrete element modeling and numerical simulation method for rock and earth mass triaxial test taking film effect

Abstract

The invention discloses a discrete element modeling method for a rock and earth mass triaxial test taking film effect. The method includes following steps: S1, modeling a sample preparing container; S2, modeling a rock-earth mass sample; S3, endowing the generated rock-earth mass sample with material attribute of given sample units, balancing stress among the sample units to complete making of the rock-earth mass sample; S4, building an elastic film, replacing a rigid barrel of a sample preparing container model with the elastic film, setting corresponding material attribute for the elastic film to complete building of a triaxial test discrete element model. Further, the invention further discloses a numerical simulation method based on the discrete element model. According to given pressurizing conditions, stress loading is adopted to axially pressurize the rock-earth mass sample, and lateral confining pressure is applied on the rock-earth mass sample through water pressure. A film unit is adopted to simulate a latex film in the triaxial test, and flexible boundary of the latex film better conforms to actual circumstance of indoor triaxial test numerical simulation.

Description

technical field [0001] The invention relates to a simulation method for indoor conventional triaxial tests of rock and soil bodies, in particular to three-dimensional discrete element modeling and simulation. Background technique [0002] Conventional triaxial test is a very basic and important experiment in geotechnical testing. Its equipment is simple and easy to operate. It can well study the stress and deformation characteristics of rock and soil, and obtain some reliable strength parameters such as shear strength. However, indoor experiments take a long time, and the data are often highly discrete. It is difficult to reveal the microscopic mechanism of complex macroscopic phenomena. Numerical simulation is a good means to reveal the microscopic mechanism of triaxial test. Since its introduction, the discrete element method has been quickly introduced due to its good simulation ability for discontinuous media and the ability to clearly reflect the microscopic deformation...

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Problems solved by technology

[0003] During the triaxial test simulation, when simulating components such as the base of the device and impermeable stones, the edges of the conventional discrete element model are relatively rough, which makes the overall friction of the surface relatively large, making it difficult to simulate effectively

[0004] In the discrete element simulation of the triaxial test, when simulating the lateral constant confining pressure, the usual practice is to use the rigid plate controlled by the servo control system. This method is complicated to operate. Although the lateral confining pressure can be controlled constant, it will inhibit the lateral The large deformation makes the simulation results have a certain error, and when setting the loading plate, in order to avoid the interaction between the boundaries, always leave a little gap

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