Research on Shear Failure Criterion for Layered Rock Mass

Abstract

In order to study the stability of layered rock mass, a shear failure criterion for layered rock mass is presented and its program is compiled in C language. The shear failure criterion consists of two parts: firstly, four empirical expressions are suggested in which shear strength parameters vary with the direction; secondly, a pilot calculation method is developed to judge whether a shear failure plane in layered rock mass occurs or not and give its occurrence under three dimensional stress condition. A triaxial numerical experiment on layered rock mass is designed to test the shear failure criterion, and its results reflect the characters including obliquity effect, confining pressure effect and failure mode which conform to the previous triaxial tests.

Implementation of a constitutive model for anisotropic rocks based on modified Lade failure criterion

“…To calibrate the remaining two parameters ( m and n ), the trial-and-error method can be employed to obtain the optimal solutions based on the least sum of square error (LSSE). Take the UCS of layered rock as an example provided by Zhang et al 28 . To cohesive, the γ 0 , γ 90 , γ min and θ are 24.84 MPa, 28.97 MPa, 19.95 MPa and 35°, respectively, based on the test data.…”

“…Uniaxial and triaxial test database for model validation.In order to reflect the advantages of proposed model in describing the rock anisotropy, a group of comparison including Donath's model, McLamore and Gray's model, and proposed model, is carried out based on the experimental data of UCS28 , which is shown in…”