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| Calculation method and applicability of surrounding rock pressure of shallow-buried rocky shield tunnel#br# |
| YAN Qingming1, 2, 3, CUI Lan1, 2, SHENG Qian1, 2, ZHENG Junjie4, ZHU Zeqi1, 2, TANG Xiongjun5 |
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering Safety, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. College of Marine Science and Technology, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China; 4. School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China; 5. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan, Hubei 430063, China)
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Abstract Research on surrounding rock pressure predominantly focuses on deep-buried tunnels employing the New Austrian tunneling method, with relatively little attention given to shallow-buried rocky shield tunnels. To formulate an equation for calculating surrounding rock pressure in these tunnels, a gap parameter is introduced based on the non-uniform convergence mode of the tunnel section. A two-stage numerical calculation model is developed to elucidate the key influencing factors of surrounding rock pressure, resulting in a comprehensive collection of sample results under varying conditions. A multi-factor curve fitting method is utilized to derive the surrounding rock pressure, leading to the establishment of a calculation equation applicable to different directions and locations within the tunnel. Measured data on surrounding rock pressure from several cases of shallow-buried rocky tunnels are compiled, and a comparison is made among the calculation equation, measured data, existing theories, and standardized methods to validate the proposed equation’s reasonableness. Furthermore, the differences among these methods are analyzed. The variation of surrounding rock pressure in relation to five types of influencing factors is discussed. Based on the shallow-buried rocky shield tunnel project in Wuhan, which runs beneath the Yellow Crane Tower, a fiber-optic measuring device is developed to monitor surrounding rock pressure. The measured results are compared with those predicted by the proposed calculation equation, thereby confirming its applicability. The findings indicate that: (1) The lateral pressure coefficient and gap parameters significantly influence the surrounding rock pressure of shallow-buried rocky shield tunnels; (2) The discrepancy between calculated and measured values of surrounding rock pressure remains within a 10% range. The proposed calculation equation demonstrates practical utility and provides reference value for the engineering of shallow-buried rocky shield tunnels.
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2025, Vol. 44 
