Numerical Simulation of Dynamic Characteristics of Tunnel Lining Concrete/Rock Interface
GAO Huan1, ZHAI Yue1,2, WANG Tienan1, XIE Yifan1, LI Yan1,2
1.School of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China;
2.Key Laboratory of Western China’s Mineral Resources and Geological Engineering (Ministry of Education), Chang’an University, Xi’an 710054, China
Abstract:In order to study the dynamic failure mechanism of concrete-rock combined body, the split Hopkinson (SHPB) pressure bar numerical model was established by LS-DYNA software.The relationship between curves of - , the strength and energy characteristics of the combined body with different impact load, active confining pressure, joint contact area, shape and rock dip angle were analyzed. The results show that: among the above five factors, the interaction between rock dip angle and peak stress was the strongest, which satisfied the power function relationship. When the rock dip angle was close to the material failure angle of 45°, the combined body failure was more serious, and the dissipation energy was the largest; the existence of interface made the propagation of stress wave in concrete rock specimen became more complex, and the dynamic peak strength of the combined body mainly depended on the concrete. Under the same incident energy, the reflection energy of concrete-granite, granite-concrete samples and concrete monomer was more closer. Compared with the concrete monomer, the transmission energy of rock monomer with high wave resistance was larger, and the absorption energy was smaller. The fracture morphology of composite was mainly manifested by splitting and compression shear failure of concrete. It is helpful to understand the dynamic failure law of rock strata.
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