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开挖扰动作用下节理化岩体弹性模量研究

发表时间:2010-08-31  浏览量:1209  下载量:579
全部作者: 姚高辉,王贻明,夏红春
作者单位: 北京科技大学土木与环境工程学院;蒙自矿冶有限责任公司
摘 要: 原地直接测定节理化岩体的弹性模量在工程实践中有一定困难,作为一种替代方法,通常根据实验室测得岩石弹性模量间接换算确定。在考虑地下开挖对巷道围岩扰动作用的基础上,分别对不含地下水和含裂隙水2种赋存条件下岩体弹性模量进行研究。首先,通过引入节理间距Js对传统地质强度指标(geological strength index, GSI)法进行改进,以定量化岩体结构参数详细确定岩体GSI值。采用扩展后的Hoek�Brown准则,引入岩体扰动系数D,计算不考虑地下水因素时岩体的弹性模量。然后,提出应变渗流耦合模型,建立岩体中节理裂隙与岩块在开挖扰动作用下的变形协调关系,利用地下开挖体涌水量和岩体折减系数计算含裂隙水岩体弹性模量。经应用表明:上述方法可较准确地反映节理岩体的弹性模量,值得在同类工程中推荐。
关 键 词: 采矿工程;Hoek-Brown准则;地质强度指标;弹性模量折减系数;渗透系数
Title: Study on elastic modulus for jointed rock mass under excavation disturbance
Author: YAO Gaohui,WANG Yiming,XIA Hongchun
Organization: Civil and Environment Engineering School, University of Science and Technology Beijing; Mengzi Mining and Metallurgy Co., Ltd.
Abstract: It is often difficult in engineering practice to make a direct in�situ measurement of the elastic modulus of jointed rock mass. As an alternative method, the rock elastic modulus measured in the lab is generally used to indirectly determine the elastic modulus of jointed rock mass. Based on consideration of excavation disturbance to tunnel surrounding rock, study on elastic modulus was carried out under two kinds of occurrence condition: no ground water or fissure water containing. Firstly, traditional geological strength index (GSI) method was improved by introducing joint spacing Js, and GSI values were determined by quantitative structural parameters of rock mass. By use of expanded Hoek�Brown criterion, and introduction of disturbance factor D, the elastic modulus of rock mass not taking groundwater factor into account can be calculated. The strain coupled hydraulic model was proposed to establish the deformation coordination relations under excavation disturbance between the fracture and the rock blocks. Rock mass elastic modulus was calculated based on the water inflow and the reduction factor of elastic modulus. Field application of Bainiuchang mine shows that the above�mentioned method can more accurately reflect the jointed rock mass elastic modulus, which is worth recommendation in similar projects.
Key words: mining engineering; Hoek-Brown criterion; geological strength index; reduction factor of elastic modulus; hydraulic conductivity
发表期数: 2010年8月第16期
引用格式: 姚高辉,王贻明,夏红春. 开挖扰动作用下节理化岩体弹性模量研究[J]. 中国科技论文在线精品论文,2010,3(16):1690-1695.
 
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