Abstract
In this study, we reviewed the influence of various heterogeneity factors of rock mass on the displacement of the tunnel. We derived the critical deformation formula and proposed the stability evaluation method via the elastoplastic analytical solution of a circular tunnel. The traffic tunnel of the Sanhekou hydro-junction project was taken as an example to establish the heterogeneous rock mass finite difference method model. A new method is proposed to obtain the most basic heterogeneous rock mass parameters, and evaluated the stability of the heterogeneous rock mass tunnel. The results showed that when the weak interlayer is randomly distributed, the deformation of the wall increases with the decrease in the average value of the parameters, and it is significantly affected by its standard deviation. The core of the stability evaluation process of the heterogeneous rock mass tunnel is to obtain the radius of the plastic zone and the distribution of weak interlayer. If the distribution characteristics of the interlayer are not determined, the critical deformation may be appropriately reduced by 15% to evaluate the stability of the tunnel. We also verified the reliability of the stability evaluation method by monitoring the 2# diversion tunnel of the Zi**pu hydraulic project.
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Funding
This study is sponsored by the National Natural Science Foundation of China (Grants No. 42177158, 11902249 and 11872301), Key Research and Development project of Shaanxi Province (No. 2022SF-412), Education Bureau of Shaanxi Province in China (Grant No. 20JS093). Opening fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology (Grants No. SKLGP2022K005). Open subject of Urban Geology and Underground Space Engineering Technology Research Center of Shaanxi Province (2022KT-01). The financial support provided by this sponsor is greatly appreciated.
national natural science foundation of china,11902249,mingming he,11872301,mingming he
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Li, G., He, M. & Bai, Y. The influence of the heterogeneity of rock mass for surrounding rock stability evaluation of a tunnel. Bull Eng Geol Environ 82, 144 (2023). https://doi.org/10.1007/s10064-023-03145-z
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DOI: https://doi.org/10.1007/s10064-023-03145-z