Numerical investigation of arching mechanism to underground excavation in jointed rock mass

被引：53
|
作者：
He, L. [1 ,2 ]
Zhang, Q. B. [1 ]
机构：
[1] Monash Univ, Dept Civil Engn, Clayton, Vic 3800, Australia
[2] Nanyang Technol Univ, Sch Civil & Environm Engn, Singapore 639798, Singapore
来源：
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY | 2015年 / 50卷
基金：
美国国家科学基金会;
关键词：
Pressure arch; Voussoir beam theory; Rock bolts; Discontinuous deformation analysis; DISCONTINUOUS DEFORMATION ANALYSIS; STABILITY; DDA;
D O I：
10.1016/j.tust.2015.06.007
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
In this paper, the discontinuous deformation analysis (DDA) is applied to numerically investigate the formation of pressure arch and the stabilization mechanism of rock bolts for underground excavation in laminated rock mass. A global pressure arch with elevated stress is observed sustaining the weight of the overburden and providing the natural shield over the opening. Below the pressure arch is a loosened zone, where a group of local voussoir beam arches are formed to transfer the weight of each layer to the abutments. Detailed parametric studies regarding the in-situ stress ratio, joint friction angle, overburden depth and dip angle of strata are conducted and their influences on the formation of global pressure arch and local voussoir beam arches are identified and discussed. Based on the observed phenomena, the corresponding reinforcement scheme is proposed and the effectiveness and stabilization mechanism are examined. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：54 / 67
页数：14
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