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| Dynamic deformation and failure characteristic of deep buried tunnel crossing fault under far-field earthquake loading |
| JIANG Yujing1, WANG Xingda1,2, ZHANG Xuepeng1*
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1. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, Shandong, China;
2. College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China |
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Abstract Dynamic response of deep buried tunnel structure crossing fault under the action of seismic waves was numerically analyzed based on the discrete element theory to explore the fundamental deformation and failure characteristic of tunnels. The simulation tests took fault location, normal distance between fault and tunnel center, fault dip angle and surrounding rock grade as design factors. All the lining structures showed deformation characteristics from elliptic mode to twisted mode under seismic waves with regardless of the spatial relation of the tunnel and fault. The surrounding rock mainly failed in shear and the plastic zone of the rock mass near the fault extended to the fault. When the fault passing through the center of the tunnel, the lining deformed in shear due to the seismic induced activation of the fault, and the plastic zone of surrounding rock extended along the fault plane. With the constant fault dip angle and surrounding rock grade, the greater the normal distance between the fault and tunnel was, the safer the tunnel was. With the constant normal distance and surrounding rock grade, the plastic zone area of surrounding rock decreased first and then increased with the increase of fault dip angle, vice versus for the maximum residual displacement of lining. When the surrounding rock grade was Ⅲ, the lining showed roughly circular deformation characteristic instead of obvious elliptic deformation and the plastic zone area of the surrounding rock was significantly reduced comparing to that of grade Ⅳ surrounding rock. When the surrounding rock grade was Ⅴ, the fault influence on the tunnel deformation was not obvious, and the lining finally showed convergent deformation characteristic.
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Received: 20 November 2022
Published: 20 September 2023
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