| Citation: | Xu Junshan, Wang Jianxin, Chen Xingqiang, Zhang Ce, Zhang Yanshan, Wang Jian, Ding Lifeng, Wang Xianjun, 2022. Effects of Poisson Ratio on In-Situ Stress Field near the Jiali Fault along the Sichuan-Tibet Railway. Earth Science, 47(3): 818-830. doi: 10.3799/dqkx.2022.029
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The Sichuan-Tibet Railway crosses the Jiali fault in Bomi. Therefore, studying the in-situ stress field around the Jiali fault is very important to understanding the influence of Jiali fault on the in-situ stress field along the Sichuan-Tibet Railway corridor. In this study, the in-situ stress field of Tonggu area and its neighboring areas of Lulang and Duokang are studied via numerical models. The loading conditions and geomechanical parameters of three models are analyzed. The results show that: (1) Poisson ratio that varies with depth is more suitable for fitting the measured data of in-situ stress. (2) The in-situ stress field shows obvious regional differences. The in-situ stress in the Duokang area is relatively high, demonstrating a strong compressional state, while the compression in the Lulang area is only about 1/3 of that in the Duokang area. The field in Tonggu area shows that the compression is very weak. It means that the stress along the Jiali fault zone may have been released. (3) Based on the measured data and appropriate geomechanical parameters, the local stress field in the shallow part of the crust can be effectively predicted, whereas the accurate upper limit of Poisson's ratio is needed to predict the stress field in the deeper part.
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