秦岭公路隧道通风竖井岩爆预测和防治措施  

Rock burst prediction for ventilation shaft of Qinling highway tunnel and its countermeasures

作　　者：徐士良[1,2] 朱合华[1] 丁文其[1] 刘宝许 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,地下建筑与工程系,上海200092 [2]安徽建筑工业学院岩土工程系,合肥230022 [3]中交隧道工程局有限公司,北京100011

出　　处：《岩土力学》2009年第6期1759-1763,共5页Rock and Soil Mechanics

摘　　要：秦岭公路隧道2号通风竖井,为国内乃至世界公路隧道规模最大的竖井工程。根据工程地质资料分析,岩爆是该竖井施工过程中的主要难题。为了从岩性角度评价竖井围岩的岩爆倾向性,开展了室内岩石单轴压缩变形试验和物理模型试验,根据改进脆性指数指标和模型试验的结果,表明竖井围岩有岩爆倾向性,必须加强岩爆预测和防治。根据水压致裂法的地应力测试结果和地应力分布特点,采用三维有限元回归分析反演了竖井工程区域的初始应力场。根据竖井围岩地应力场和Kirsch解得到的围岩二次应力场,结合Russenes和陶振宇岩爆判据,进行了竖井岩爆综合预测和分析,得出竖井有轻微和中等岩爆发生的结论,并提出岩爆防治措施。No.2 ventilation shaft of Qinling highway tunnel is one of the largest ventilation shafts in the highway tunnel field at home and abroad. Rock burst is a serious problem during the shaft excavation according to the analysis of in-situ engineering geological data. For evaluating rock burst tendency from the perspective of lithological character, the uniaxial compression deformation test and physical model test are carried out. There is a high tendency of rock burst in surrounding rock by analyzing the modified brittleness index and model test result, so it is essential to strengthen rock burst prediction and control. The initial stress field of surrounding rocks of shaft is regressively analyzed by 3D finite element method according to in-situ measured data by hydro-fracturing and distribution properties of in-situ stress. Then the comprehensive rock burst prediction and analysis based on Russenes and Tao criteria are made according to the induced stress field obtained by Kirsch solutions and in-situ stress distribution of surrounding rock of shaft respectively. The result shows that the weak and moderate rock burst will occur during shaft excavation. Finally, some countermeasures to rock burst are proposed. It provides valuable references for other projects.

关 键 词：隧道工程 通风竖井 岩爆预测 地应力 有限元 

分 类 号：U459.2[建筑科学—桥梁与隧道工程]