基于线弹性断裂力学的深埋水工隧洞水力劈裂分析  

Hydraulic fracturing analysis on deep buried hydraulic tunnel based on linear elastic fracture mechanics

作　　者：左拥军 ZUO Yong-jun

机构地区：[1]万年县水利局,江西万年县335500

出　　处：《东北水利水电》2021年第1期55-58,72,共5页Water Resources & Hydropower of Northeast China

摘　　要：我国西部地区水电站多位于高山峡谷地区,水工隧洞常被深埋于地下水位以下的位置,导致水工隧洞常出现水力劈裂现象。本文采用线弹性断裂力学分析方法从深部围岩裂纹扩展入手,建立深埋水工隧洞围岩力学模型,分析深埋水工隧洞的水力劈裂现象;在计算过程中同时考虑高地应力和高渗透压力两种情况,并引入广义临界水压力,导出广义临界水压力在拉剪复合模式下和压剪复合模式下的表达式,最后分析获得在压剪复合状态下的广义临界水压力与中心裂缝角度β之间的关系。Hydropower stations in western China are mostly located in high mountains and valleys,and the hydraulic tunnel is often buried deep below the ground water level,leading to hydraulic fracturing phenomenon.In this paper,beginning from the deep surrounding rock crack propagation based on the linear elastic fracture mechanics,a mechanical model of the surrounding rock of deep buried hydraulic tunnel is established to analyze the hydraulic fracturing phenomenon of deep buried hydraulic tunnel.At the same time considering the high ground stress in the process of calculation and high seepage pressure two cases,and introduce the generalized critical water pressure,induces expression of generalized critical water pressure in tension-shear compound mode and the compressionshear compound mode.In the final,the relationship between general critical water pressure under compression-shear composite state and center crack angleβare analyzed and obtained.

关 键 词：深埋水工隧洞 线弹性断裂力学 广义临界水压力 水力劈裂 

分 类 号：TV672.1[水利工程—水利水电工程] TV131.2