导流隧洞外水压力与施工冷缝的影响分析  

Analysis of external water pressure and construction cold joint influence on diversion tunnel

作　　者：苏凯[1] 伍鹤皋[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2009年第4期417-421,共5页Engineering Journal of Wuhan University

基　　金：国家自然科学基金资助项目(编号:50809051)

摘　　要：采用有限单元法代替传统的综合折减系数法，对某导流隧洞的渗透水压力进行了计算分析．计算表明对于完整衬砌结构，当围岩渗透系数远大于衬砌渗透系数时（1000倍以上），隧洞对山体地下水位的影响甚小，外水压力折减系数可以达到0．87以上，当围岩渗透系数与衬砌渗透系数相当时（1～10倍），隧洞对山体地下水位有较大扰动，外水压力折减系数在0．3以下．同时计算表明衬砌施工冷缝张开时排水效果显著，能显著降低隧洞周边的渗透水压力，但造成局部渗透水压力梯度明显增大．External water pressure reduction factor is one of the main kinds of factors on diversion tunnel. FEM is adopted to substitute for classical reduction factor method in the diversion tunnel external water pressure analysis. The results show that the tunnel with integral lining has little influence on the groundwater level and the external water pressure reduction factor is more than 0.87 when the rock permeability coefficient is much larger than ones of lining. And tunnel has obvious influence on the groundwater level and external water pressure reduction factor is less than 0. 3 when the rock permeability coefficient is about from 1 to 10 times ones of the lining. The lining with construction cold joint has significant drained-effect on the tunnel and the external water pressure can be reduced substantially. But the local osmotic gradient increases markedly.

关 键 词：水利工程 水工隧洞 导流隧洞 外水压力 折减系数 冷缝 

分 类 号：TV672.1[水利工程—水利水电工程]