(Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources，Yangtze River Scientific Research Institute，Wuhan，Hubei 430010，China)
Abstract：In-situ stress is very important for tunnel design and construction. In order to solve the problem that the boundary stress of each sub-region can not be continuously transferred and the whole stress field of the project can not be analyzed in the whole line in the subregional inversion of large-scale stress field，the following researches are performed. Firstly，combined with the engineering experience of inversion of the in-situ stress field，the application of boundary loads when simulating the tectonic stress field in the axial direction of the tunnel is studied based on the principle of multiple linear regression. Secondly，a“overlapping partition- combination”inversion method of in-situ stress field is proposed. Finally，the method was applied to the Shengli extra-long road tunnel in Tianshan，Xinjiang，and verifying the validity of the method. the stress field distribution characteristics of the entire engineering area was analyzed. The results show that when simulating the tectonic stress field，the boundary load should be applied from the side with the higher terrain in the calculation domain. The“overlapping partition-combination”inversion method of in-situ stress field effectively avoids abnormal stress field results caused by improper boundary loads in the direction of the tunnel axis during the overall regression inversion of the engineering area，and ensures the continuous transition of the sub-regional boundary stress. The distribution law of the overall in-situ stress field obtained by the partition combination is reasonable. The inversion method can provide reference for inversion of in-situ stress field of extra-long tunnel engineering.
周 朝，尹健民，董志宏，刘元坤，韩晓玉，张新辉. 考虑边界荷载作用方向的特长隧道初始应力场分区反演方法[J]. 岩石力学与工程学报, 2022, 41(S1): 2725-2734.
ZHOU Chao，YIN Jianmin，DONG Zhihong，LIU Yuankun，HAN Xiaoyu，ZHANG Xinhui. The partitioned inversion method of initial stress field of extra-long tunnel considering the direction of boundary load. , 2022, 41(S1): 2725-2734.
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2022, Vol. 41 
