Numerical investigation of arching mechanism to underground excavation in jointed rock mass
Numerical investigation of arching mechanism to underground excavation in jointed rock mass
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节理岩体地下开挖拱拱机理数值研究
DOI：
10.1016/j.tust.2015.06.007
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发表时间：
2015-08-01
影响因子：
6.9
通讯作者：
Zhang, Q. B.
中科院分区：
文献类型：
--
作者：
He, L.;Zhang, Q. B.
本文采用非连续变形分析（DDA）方法，对层状岩体中压力拱的形成和锚杆的稳定机理进行了数值研究。观察到一个具有升高应力的全球压力拱，该压力拱维持覆盖层的重量并在开口上方提供天然屏蔽。压力拱下方为松动区，在此形成一组局部楔土梁拱，将各层的重量传递给桥台。详细研究了地应力比、节理内摩擦角、上覆岩层深度和岩层倾角等参数对整体压力拱和局部楔土梁拱形成的影响。根据观测到的现象，提出了相应的加固方案，并对加固效果和加固机理进行了分析。(C)2015爱思唯尔有限公司版权所有。
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.