Analysis on Interfacial Stress Between Surrounding Rock and Shotcrete Lining |
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Authors: | WEN Jingzhou ZHANG Yongxing and WANG Cheng |
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Institution: | College of Civil Engineering; Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing 400045, P. R. China;College of Civil Engineering; Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing 400045, P. R. China;Department of Tunnel and Geotechnical Engineering, Chongqing Jiaotong University, Chongqing 400074, P. R. China |
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Abstract: | According to the characteristics of interfacial stress between surrounding rock and shotcrete support, mechanical model of composite curved beame for support system of tunnel surrounding rock and shotcrete lining was established, considering the interfacial deformation coordination and the effects of bearing arch of surrounding rock. Then from static equilibrium of two differential elements, the differential equations for the radial displacement of composite curved beam were obtained. All analytic formulas of both interfacial stress and internal forces between surrounding rock and shotcrete lining by arbitrary distribution load were derived. And thus the mechanical condition of interface zone and the stress concentration position were obtained, which is convenient to assess the stability of surrounding rock and predict the safety. Finally, the analysis of tunnel project excavated by bench method showed that shotcrete lining made the formation of compressive stress zone in surrounding rock by transferring stress from the interface between surrounding rock and shotcrete, which is beneficial to improve the stability of surrounding rock. |
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Keywords: | tunnel engineering shotcrete lining bearing arch of surrounding rock interfacial stress composite curved beam |
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