Experimental study on similarity materials for soft rock of deep-buried tunnels

Abstract

When every parameter is properly scaled down in accordance with some similarity coefficients, it is possible to study the physical-mechanical properties of rock mass with a scale model. To identify the key mechanisms of soft rock in deep buried tunnels, the proper sand, binder and ratio were selected. During the process, the model manufacture technology was introduced and typical tests were done and the results were presented. The physical and mechanical properties effects caused by each composition were discussed. It is shown that the physical and mechanical properties of chosen ratio material such as uniaxial compressive strength tests, elasticity modulus, tensile strength, internal frictional angle, and Poisson's ratio meet with similarity relationship well. The physical and mechanical properties of deep soft rock are simulated successfully.

Nonlinear Progressive Failure Analysis of Surrounding Rock System Based on Similarity Theory

“…Under the deep buried conditions, rock deformation may not belong to elasticity range, the interaction mechanisms of physical nonlinear and geometric nonlinear will make the evolution of rock system extremely complicated [1][2][3]. Similarity theory has been proved to be very useful to solve the problem [4][5]. As a significant method of science research, physical model test is the first introduced model which similar to the prototype in laboratory based on the similarity principles, by observing mechanical parameters and distribution of model with instrument, then deduce possible mechanics phenomenon and pressure distribution of the prototype with results of model, finally solve practical problems of rock engineering.…”

“…Li Zhongkui et al did a lot of meaningful researches on 3-D model simulation technology [9]. However, some strength indexes (like cohesive force, internal friction angle, tensile strength), the physical and mechanical properties of post-peak rock (like residual cohesive force, residual internal friction angle) are considered rarely, which makes it difficult to identify the failure mechanisms of rock mass [5].…”