- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | SUO Lang, XU Zhengxuan, FENG Tao, WANG Zhewei, YI Xiaojuan, LIN Zhiheng, LI Wei. Back-Calculation of In-situ Stress of Railway Tunnel in Xianshuihe Fault Belt[J]. Journal of Southwest Jiaotong University, 2022, 57(2): 331-338. doi: 10.3969/j.issn.0258-2724.20210945
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The distribution law of ground stress has a very important role in the construction of underground engineering, and obtaining the distribution of ground stress field in the construction area is of great significance to guide the design of support structure. The borehole hydraulic fracturing method was used to test the in-situ stress in the project area of a railway tunnel in Xianshuihe fault belt. Based on the in-situ stress results, the variation law of in-situ stress with depth was obtained and the in-situ stress inversion was carried out by numerical simulation. The results show that the in-situ stress increases gradually with the increase of depth, in which the increasing gradient of the maximum horizontal in-situ stress is 0.385 MPa/km, and that of the minimum horizontal principal stress is 0.257 MPa/km. The maximum and minimum horizontal principal stress values of the tunnel profile are 41.69 and 29.84 MPa, respectively. The lateral pressure coefficient is 1.363−1.438, and the surrounding rock stress is dominated by horizontal stress. Generally, the in-situ stress has been released to a certain extent in the fault area, and the stress of the intact rock mass on both sides of the fault is concentrated to a certain extent with a high stress value.
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