深埋隧道外水压力计算的解析—数值法  

The simulation of deep tunnel external water pressure by analytical-numerical method

作　　者：王建秀[1] 杨立中[1] 何静 

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]贵州地质工程勘察院,贵阳550008

出　　处：《水文地质工程地质》2002年第3期17-19,28,共4页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金项目 ( 4 9872 0 82 )

摘　　要：在高水头富水区 ,抗水压衬砌设计的关键在于外水压力的计算。深埋隧道排水时 ,沿轴线方向上流入隧道的水量来自于隧道掌子面的前方 ,当隧道施工足够长度后 ,可以认为已施工断面的地下水只从隧道两侧向断面内运动 ,此时可将三维问题处理为二维。对于深埋隧道 ,当其断面远小于水头时 ,可处理为一个点井 ;隧道全断面排水时 ,隧道断面线可处理为定流量边界。首先建立隧道排水的水文地质概念模型 ,采用经验解析法预测隧道的涌水量 ,然后将涌水量代入隧道围岩渗流的剖面二维模型 ,模拟隧道排水时围岩渗流场的分布 ,再采用作用系数的方法计算出隧道衬砌的外水压力。The correctly design of tunnel lining, in the area with high groundwater table, lies in the accurate calculation of external water pressure. When a tunnel is excavated to a certain length, the groundwater drained from the aquifer ahead of tunnel face can be ignored, and the 3D\|seepage problem can be simplified to 2D\|one. If a deep tunnel's dimension in section is far less than water head, the deep tunnel can be regarded as a horizontal point well. The blow of a deep tunnel can be calculated by analytical method. Taking the outflow rate into seepage's mathematical model, water head of a deep tunnel's aquifer in section can be obtained by numerical method. Then the external water pressure can be obtained by the coefficient according to the water table simulated above.

关 键 词：水文地质概念模型 经验解析法 深埋隧道 外水压力 涌水量 解析-数值法 地下水 

分 类 号：U452[建筑科学—桥梁与隧道工程]