【作者】 王涛；

【导师】 苏生瑞；

【作者基本信息】 长安大学 ， 地质资源与地质工程， 2022， 硕士

【摘要】 伴随着我国交通行业的飞速发展,越来越多的公路隧道工程相继出现。在工程建设过程中复杂的地质环境带来了极大的挑战,而地应力状态往往与工程建设休戚相关。因此,是否清楚地掌握隧址区地应力场分布特征直接影响着工程建设的合理性与安全性。本文以鹤剑一号隧道为研究对象,在资料收集和现场调查的基础上,通过现场地应力测试和数值模拟相结合的方法对隧址区的地应力场分布特征进行多尺度分析。多尺度分析主要体现在将区域应力场的“大规律”与局部应力场的“小特征”相结合,从而有助于我们更全面地掌握隧址区地应力场的分布特征,为隧道工程建设提供一定的依据。本文取得的主要认识如下:（1）通过对隧道所处块体区域应力场进行数值模拟,对块体区域的应力场、位移场有了更为具体的认识,得到了块体内部应力场的分布特征,并分析得到隧址区的最大主应力方向为NE向。（2）利用水压致裂法进行现场地应力测试,通过分析实测数据得出隧址区最大水平主应力、铅直应力与最小水平主应力均随深度的增加而增大,呈现为线性关系,且三者满足σ>σ_V>σ_h的关系,反映了隧址区地应力场以构造应力为主导,而最大水平主应力优势方向为NE72°。（3）利用实测值,结合隧址区地质条件对隧址区应力场进行模拟,将模拟得到的计算值与实测值进行对比分析,除个别点外,两者相对误差一般不超过10%,体现了模拟的可靠性。然后,通过对隧址区高地应力区及岩爆预测分析,指出了隧址区部分区段存在高地应力区与岩爆风险。（4）结合各种尺度下地应力场分布特征,可以看出,隧址区地应力场基本符合区域性地应力场的分布规律,但又受到局部断层破碎带、地层岩性以及地形等因素的影响而有着一定的差异。更多还原

【Abstract】 Along with the rapid development of my country’s transportation industry,more and more highway tunnel projects have appeared one after another.In the process of engineering construction,the complex geological environment brings great challenges,and the state of in-situ stress is often closely related to engineering construction.Therefore,whether or not to clearly grasp the distribution characteristics of the in-situ stress field in the tunnel area directly affects the rationality and safety of the engineering construction.This thesis takes the Hejian No.1 tunnel as the research object,on the basis of data collection and field investigation,the multi-scale analysis of the distribution characteristics of in-situ stress field in the tunnel area by the method of combining on-site in-situ stress test and numerical simulation.Multi-scale analysis is mainly reflected in the combination of the"large law"of the regional stress field and the"small features"of the local stress field,this will help us to more comprehensively grasp the distribution characteristics of the in-situ stress field in the tunnel site area,and provide a certain basis for the construction of tunnel engineering.The main understandings of this paper are as follows:（1）Through the numerical simulation of the stress field in the block area where the tunnel is located,we have a more specific understanding of the stress field and displacement field in the block area,and obtain the distribution characteristics of the stress field in the block,and the analysis shows that the direction of the maximum principal stress in the tunnel area as NE,which is consistent with the measured value.（2）Hydraulic fracturing method is used for in-situ stress measurement,by analyzing the measured data,it is concluded that the horizontal maximum principal stress,vertical stress and horizontal minimum principal stress in the tunnel area increase with the increase of depth,showing a linear relationship,and the three satisfy the relationship ofσ>σ_V>σ_h,it reflects that the in-situ stress field in the tunnel area is dominated by tectonic stress,and the dominant orientation of the horizontal principal stress is NE72°.（3）Used the measured values,combined with the geological conditions of the tunnel site area,the stress field in the tunnel site area was simulated,and the calculated values obtained from the simulation were compared with the measured values,except for individual points,the relative error between the two is generally no more than 10%,which reflects the reliability of simulation.Then,through the analysis of high in-situ stress area and rockburst prediction analysis of the tunnel site area,it is pointed out that there are high in-situ stress areas and rockburst risks in some sections in the tunnel site area.（4）Combined with the distribution characteristics of in-situ stress field at various scales,the in-situ stress field in the tunnel site basically conforms to the distribution law of regional in-situ stress field,but it has certain differences due to the influence of local fault fracture zones,formation lithology and topography.更多还原