Analytical and numerical solutions for shear mechanical behaviors of structural plane

HE Zhong-ming(何忠明)^{1, 2}, XIONG Zhe-yi(熊喆怡)³, HU Qing-guo(胡庆国)², YANG Ming(杨明)⁴

(1. Key Laboratory of Special Environment Road Engineering of Hunan Province,
Changsha University of Science & Technology, Changsha 410004, China;
2. School of Traffic and Transportation Engineering, Changsha University of Science & Technology,
Changsha 410004, China;
3. School of Resources & Safety Engineering, Central South University, Changsha 410083, China;
4. School of Earth Science and Information Physics, Central South University, Changsha 410083, China)

Abstract:The original descriptive model of shear stress and shear displacement only reflects the stress deformation characteristics of plastic structural plane. The index model was revised and piecewise index model was built to describe the stress deformation characteristics of plastic structural plane and brittle structural plane. The relation of stress and strain to the failure mode of structural plane considering the effect of its shape was investigated, and a model which could reflect the relation between undulate angle and shear strength was built. The result indicates that structural plane presents nonlinear characteristics, specifically, the value of undulate angle, as well as corresponding shear strength, becomes larger as the normal stress decreases.

Key words:structural plane; shear mechanical behavior model; failure mode; nonlinear characteristics; numerical analysis