基于渗流力作用的围岩渗透系数分布规律研究

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英文篇名：Study on the Distribution Law of Permeability Coefficient of Surrounding Rock Based on Seepage Force 作者：王宗建 ; 李振 ; 卢谅 ; 刘韵然 英文作者：Wang Zongjian;Li Zhen;Lu Liang;Liu Yunran;College of River&Ocean Engineering,Chongqing Jiaotong University;School of Civil Engineering,Chongqing University; 关键词：高水压隧道 ; 渗透系数 ; 渗流-应力耦合 ; 渗流力 英文关键词：tunnel with high water pressure;;permeability coefficient;;seepage-stress coupling field;;seepage force 中文刊名：BASE 英文刊名：Chinese Journal of Underground Space and Engineering 机构：重庆交通大学河海学院;重庆大学土木工程学院; 出版日期：2018-12-15 出版单位：地下空间与工程学报 年：2018 期：v.14;No.111 基金：国家自然科学基金(51679018);; 重庆市基础科学与前沿技术研究专项(cstc2017jcyjA1410);; 中央高校基本科研业务费专项资金(106112016CDJXY200003) 语种：中文; 页：BASE2018S2020 页数：6 CN：S2 ISSN：50-1169/TU 分类号：131-136

摘要

高水压深埋山岭隧道涌水量预测的关键问题是合理确定符合实际地质情况的围岩渗透系数。针对高水压隧道开挖后围岩渗流场-应力场耦合问题,推导出围岩裂隙面正应力增量表达式;基于地下水动力学理论推导了地下水渗流力计算公式,运用FLAC 3D验证了其应用可行性;得出考虑渗流力影响的围岩渗透系数表达式,并通过算例验证了渗流力变化对围岩渗透系数的影响。计算结果表明:由于围岩渗流场-应力场耦合作用影响,隧道开挖一定影响范围内围岩渗透系数变化较大;该范围以外渗透系数受渗流力变化影响较大。高水压深埋山岭隧道涌水量的预测计算要考虑渗流场-应力场耦合作用的影响。
        The key problem in forecasting the inflow of water in the deep buried mountain tunnel with high water pressure is to reasonably determine the permeability coefficient of the surrounding rocks in accordance with the actual geological conditions.In view of the coupling problem of seepage field and stress field of surrounding rock after excavation of high water pressure tunnel,the expression of positive stress increment in the fracture surface surrounding rock derived.Based on the kinetic theory of groundwater,the formula of seepage force of groundwater derived,and the feasibility of its application verified by Flac3 D.The expression of coefficient of surrounding rock considering the influence of seepage force obtained.The influence of seepage force on the permeability coefficient of surrounding rock verified by an example.The results show that the permeability coefficient of the surrounding rock changes greatly in the tunnel excavation areadue to the influence of the coupling of percolation field and stress field.The permeability coefficient outside this range is greatly affected by the variation of seepage force.The influence of the coupling of seepage field and stress field should be considered in the prediction and calculation of the water inflow in the deep buried mountain tunnel with high water pressure.

引文

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