岩土工程学报2017，Vol.39Issue(12)：2312-2319,8.DOI:10.11779/CJGE201712021
不同接触状态岩石节理的剪切力学性质试验研究
Experimental studies on mechanical behaviour of rock joints with varying matching degrees
摘要
Abstract
Besides surface roughness, the matching degree between the joint upper and lower blocks is another important factor affecting the shear behavior of a rough rock joint. A simplified way, by imposing varying magnitudes of horizontal dislocation along the shear direction between the joint upper and lower blocks, is used to model the different matching degrees of a joint that is made by cement. A large number of direct shear tests are then performed under constant normal stress condition to investigate the shear behavior of rock joints under the varying matching degrees. The experimental observations indicate that with the increase of dislocation, the peak shear strength decreases and has a larger reduction rate under the lower normal stress level. With the increasing dislocation, the peak shear displacement increases, and the shear stiffness decreases and gradually approaches a constant. The influence of dislocation on the shear stiffness is more prominent under a higher applied normal stress. Several simple combinations of roughness parameters and normalized dislocation are used to perform regression analysis, and a new empirical peak shear strength criterion is put forward to capture the peak shear strength degradation of rock joints under different matching degrees. A preliminary comparison between the proposed criterion and the existing criteria is also provided. The new parameters for the proposed criterion can be easily determined in the laboratory.关键词
岩石力学/节理/直剪试验/剪切力学性质/峰值剪切强度准则Key words
rock mechanics/joint/direct shear test/shear behavior/peak shear strength criterion分类
建筑与水利引用本文复制引用
唐志成,王晓川..不同接触状态岩石节理的剪切力学性质试验研究[J].岩土工程学报,2017,39(12):2312-2319,8.基金项目
国家自然科学基金面上项目(41672302,41731284,11672360,41402247,51504166) （41672302,41731284,11672360,41402247,51504166）
高等学校博士学科点专项科研基金项目(20130141120051) （20130141120051）
