New peak shear strength model for cement filled rock joints

被引：78

作者：

Tian, Yongchao ^{[1
]}

Liu, Quansheng ^{[1
]}

Ma, Hao ^{[1
]}

Liu, Qi ^{[1
]}

Deng, Penghai ^{[1
]}

机构：

[1] Wuhan Univ, Sch Civil Engn, Key Lab Safety Geotech & Struct Engn Hubei Prov, Wuhan 430072, Hubei, Peoples R China

来源：

ENGINEERING GEOLOGY | 2018年 / 233卷

基金：

中国国家自然科学基金;

关键词：

Grouted joint; Unfilled joint; Cement stone; 3D surface morphology; Peak shear strength; CRITERION; BEHAVIOR; FOUNDATIONS; PREDICTION; JRC;

D O I：

10.1016/j.enggeo.2017.12.021

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Grouting can significantly improve the mechanical properties of a fractured rock mass. A set of indoor grouting test systems is designed, and 3D scanning and direct shear tests are carried out for 10 groups of grouted joint specimens. In this study, grouted joints are simplified to unfilled joints and cement stone (including the bulk paste and transition zone). The impact of cement stone on unfilled joints is defined as the filling effect and bonding effect. First, 3D morphological characteristics of unfilled joints are analyzed. Then, a weak-filling joint shear model is derived based on the existing shear strength model for unfilled joints. Finally, the shear model for grouted joints is derived from the shear model for filled joints. Reinforcement mechanisms, failure modes and causes of error in grouted joints are discussed. The effects of roughness, filling degree, rock to filling material strength ratio, normal stress and cohesion on peak shear strength are considered comprehensively in the new model for grouted joints. The new model is consistent with the basic form of the Mohr-Coulomb criterion. The good agreement between test data and calculated results from the new model indicates the new model is suitable for predicting the shear strength of grouted joints.

引用

页码：269 / 280

页数：12

共 31 条

[1]

[Anonymous], 2009, THESIS

[2] REVIEW OF A NEW SHEAR-STRENGTH CRITERION FOR ROCK JOINTS [J].