Soft-hard interbedded wall rock tunnel construction simulation method considering bedding action

Abstract

The invention provides a soft-hard interbedded wall rock tunnel construction simulation method considering bedding action, comprising the steps of S1, acquiring related physical parameters of wall rock: processing tunnel wall rock to be simulated into a standard test piece according to Regulation for Testing of Physical and Mechanical Properties of Rock by using rock conventional mechanical property test, and acquiring related physical parameters of wall rock through uniaxial / triaxial compression test and shear test; S2, imparting a wall rock simulation unit to the mechanical parameters acquired by the tests of step S1, and carrying out simulation analysis by using self-contained elastic-plastic constructive model of ANSYS software, dp rules and contact pair effect. The simulation method provided herein enables the simulation for changes and influences generated by bedding stress field, displacement field and the like in the whole process of soft-hard interbedded wall rock tunnel excavation, the problem that nonlinear analytical results fail to converge in the simulation process is solved, simulation results may indicate that whether bed separation and the like occur after tunnel excavation, the simulation better meets the engineering actuality, and the simulation results may guide actual tunnel construction.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a method for simulating the construction of a tunnel with soft and hard interbedded surrounding rock considering bedding. Background technique [0002] ANSYS software has shown powerful functions in the numerical simulation of geotechnical engineering. In the current tunnel construction simulation methods, one is to use spring elements to simulate the force transfer relationship between the surrounding rock and the lining. The force is usually determined empirically and the third principal stress cannot be considered. The other is to regard the entire rock mass as a transversely isotropic body. This method assumes that the soil layers are firmly bonded and do not slip. However, the inventors of the present invention have found that this method cannot simulate excavation. The effects and changes of front and rear bedding in the tunnel construction process are different...

AI Technical Summary

Problems solved by technology

[0004] In view of the fact that the existing simulation method cannot simulate the effect and change of bedding in the process of tunnel construction before and after excavation, there is a certain discrepancy with the actual situation, and this method is not suitable for soft and hard interbedded surrounding rock with obvious bedding. The current method for simulating bedding action also has the technical problem of non-convergence of nonlinear analysis results. The present invention provides a tunnel construction simulation method for soft and hard interbedded surrounding rocks that considers bedding action