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| Research on the Three-dimensional Inversion Technology of In-situ Stress in a Long and Deep Tunnel of Haolebaoji-Ji'an Railway |
| ZHANG Chen, SHEN Bo, LIU Guiwei |
| China Railway Design Corporation, Tianjin 300251, China |
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Abstract Research purposes: Because of the difficulty of regional in-situ stress evaluation and obtaining the real situation of regional in-situ stress through the measured method, based on the measured point in-situ stress data, a method combining GBDT algorithm and three-dimensional numerical simulation is proposed to predict the regional in-situ stress state of rock mass within Ruyi tunnel project scope of Haolebaoji-Ji'an railway. It turns out that the prediction and evaluation of regional in-situ stress level is closer to the actual situation.
Research conclusions: (1) By comparing GBDT algorithm with traditional regression analysis method, the former has higher accuracy, better interpretation and system robustness to low dimensional data which can better map the natural performance of high stress area. (2) The example shows that the combination of GBDT algorithm and numerical simulation method is feasible for regional in-situ stress evaluation. The evaluation conclusion of regional in-situ stress level of Ruyi tunnel project proves that the method proposed in this paper is closer to the actual situation. (3) The numerical inversion results show that the stress value along Ruyi tunnel increases with the increase of buried depth. There is a certain stress concentration at the foot of gully. The horizontal stress field is dominant in this area. (4) The three-dimensional inversion technology of in-situ stress based on GBDT algorithm can be mainly applied to the field of in-situ stress state evaluation of deep buried tunnels.
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Received: 18 May 2022
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2022, Vol. 39 
