【摘要】 通过地应力测量,确定出工程区隧道围岩现今地壳应力状态,即原地应力的大小和方向。根据地应力分布特征,结合隧道围岩的力学参数,利用三维有限元对工程隧道区进行了应力场模拟。根据原地应力测量及三维计算结果进行综合分析,给出了工程区地应力的赋存规律和基本特征,并进一步分析了隧道开挖中发生岩爆等地质灾害的可能性,同时为隧道的衬砌设计、断面选择及轴线方位的确定提供可靠的科学依据。更多还原

【Abstract】 Rock stress state in situ is determined by the hydrofracturing method for rock stress measurement in a railway tunnel in northwestern Yunnan.According to the distribution features of the rock stress,combined with the mechanical parameters of the tunnel wall rocks,the stress filed in the tunnel area is simulated by using the three-dimensional finite elements.According to the in-situ stress measurements and three-dimensional finite element calculation,the basic features and distribution of the rock stress in engineering area are given,and the possibility of occurrence of geological hazards such as rock bursts during excavation of the tunnel is analyzed.Furthermore,the scientific basis for the lining design of the tunnel,choice of the tunnel’s cross-section and determination of the axial direction of the tunnel is provided.更多还原