高压隧洞裂隙渗流的离散元数值分析  

Analysis of Seepage Control Effects of Fractured Rock Mass in High-pressure Tunnel Based on Distinct Element Method

作　　者：林太清[1] 高江林[1] LIN Taiqing;GAO Jianglin(Jiangxi Provincial Institute of Water Sciences, Nanchang 330029, Jiangxi, Chin)

机构地区：[1]江西省水利科学研究院,江西南昌330029

出　　处：《水力发电》2018年第5期40-44,共5页Water Power

基　　金：江西省水利厅科技项目(KT201603;KT201708);国家重点研发计划项目(2016YFC0401603)

摘　　要：基于离散单元法,采用二维离散元程序(UDEC),对高压隧洞裂隙岩体的渗控效应进行数值模拟分析,得到高压隧洞裂隙岩体的优势渗透路径和渗控效应规律。结果表明,固结灌浆对防渗起到一定的效果,可有效降低围岩的孔隙水压力及其水力梯度,但仅在固结灌浆的处理下,钢衬段裂隙水压力依然很大;高压隧洞围岩的优势渗流通道主要分布在断层和裂隙上,水力梯度突增;离散元数值模拟结果较为真实地反映了工程实际,可为渗控措施优化设计提供参考。A two-dimensional distinct element method program （UDEC） based on Distinct Element Method （DEM） is adopted to simulate the seepage of fractured rock mass in high-pressure tunnel, and the preferential flow pathways and the seepage control effect laws are obtained. The study resuhs show that： （a） the high pressure consolidation grouting has a certain effect on seepage prevention, which can effectively reduce pore hydraulic pressure and hydraulic gradients of surrounding rock, but the fissure hydraulic pressure in steel lining section is still very large when only treated by consolidation grouting; （b） the faults and cracks are the main preferential seepage channels of surrounding rock and the hydraulic gradients are increased obviously here; and （c） the DEM can simulate the seepage of fractured rock more realistically, which are helpful to the optimization design of seepage control in actual projects.

关 键 词：高压隧洞 优势渗透路径 渗流控制 离散单元法 数值模拟 

分 类 号：TV223.6[水利工程—水工结构工程]