【摘要】 宝塔山隧道全长10 480 m,最大埋深600 m,属目前山西省最长的公路隧道。复杂的地形地貌条件以及地质构造影响,使得隧道区地应力分布复杂。为研究隧道区岩体应力场特征,首先介绍了水压致裂法地应力测试成果,以此为基础通过有限元分析得到应力剖面,最后从地形地貌、地质构造、地质力学角度综合分析了区域构造应力场。结果表明,测试范围内地应力大小属于中等应力水平,隧道设计高程处最大水平主应力方位大部分集中在N42°E~N56°E,现场测试及有限元分析所得地应力场与区域构造应力场相符。更多还原

【Abstract】 Baotashan tunnel is the longest highway tunnel in Shanxi province with a full length of 10 480 m and a maximum burial depth of 600 m.The complex topography and geomorphology and geological structures give rise to a complicated in-situ stress distribution in the tunnel area.To study the characteristics of rock in-situ stress field in the tunnel area,this paper firstly present the measured results of geostress by hydro-fracturing method,based on which the stress profile along the tunnel is obtained by FEM analysis,and finally the regional tectonic stress field is comprehensively analyzed from perspectives of topography and geomorphology,geologic structure,and geomechanics.The research manifested that in-situ stress in the test area can be defined as middle level stress,and the maximum horizontal principal stress in the tunnel design elevation is mainly concentrated in N42°E～N56°E,and regional tectonic stress field is consistent with in-situ stress field achieved by site test and numerical simulation.更多还原