Numerical Built-In Method for the Nonlinear JRC/JCS Model in Rock Joint

Qunyi Liu,Ying Li,Wanli Xing

doi:10.1155/2014/735497

Qunyi Liu, Ying Li + Show 1 more

Open Access

https://doi.org/10.1155/2014/735497

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Abstract

The joint surface is widely distributed in the rock, thus leading to the nonlinear characteristics of rock mass strength and limiting the effectiveness of the linear model in reflecting characteristics. The JRC/JCS model is the nonlinear failure criterion and generally believed to describe the characteristics of joints better than other models. In order to develop the numerical program for JRC/JCS model, this paper established the relationship between the parameters of the JRC/JCS and Mohr-Coulomb models. Thereafter, the numerical implement method and implementation process of the JRC/JCS model were discussed and the reliability of the numerical method was verified by the shear tests of jointed rock mass. Finally, the effect of the JRC/JCS model parameters on the shear strength of the joint was analyzed.

Highlights

The Mohr-Coulomb linear model is generally used to study the characteristics of rock mass strength [1,2,3]
The joint surface is widely distributed in the rock, leading to the nonlinear characteristics of rock mass strength and limiting the effectiveness of the linear model in reflecting characteristics [8]
Park and Song [15] produced a rough joint with a joint roughness coefficient (JRC) value ranging from 10 to 20 in an intact sample by defining the jointcontacts along a predefined joint surface

Summary

Introduction

The Mohr-Coulomb linear model is generally used to study the characteristics of rock mass strength [1,2,3]. Lin et al [1] used numerical algorithm to simulate the mechanical behavior of a layered rock mass under true triaxial compression by Mohr-Coulomb linear model. The joint surface is widely distributed in the rock, leading to the nonlinear characteristics of rock mass strength and limiting the effectiveness of the linear model in reflecting characteristics [8]. Thereafter, the numerical implement method and implementation process of the JRC/JCS model were discussed and the reliability of the numerical method was verified by the shear tests of jointed rock mass. The effect of the JRC/JCS model parameters on the shear strength of the joint was analyzed

Theoretical Derivation

Numerical Implementation

18 Test data

Conclusions