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Dynamic Response of Shallow-Buried Tunnels Traversing High Loess Slopes
SUN Wen1,2,3, LIANG Qingguo1,2, WANG Lili4, CAO Xiaoping2
1.National Demonstration Center for Experimental Civil Engineering Education, Lanzhou Jiaotong University, Lanzhou 730070, China;2.School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;3.Gansu Architectural Science Research Institute Co., Ltd., Lanzhou 730070, China;4.Key Laboratory of Loess Earthquake Engineering of China Earthquake Administration, Lanzhou 730000, China
摘要:
Considering the existence of numerous shallow-buried tunnels traversing high slopes in the loess area in western China and the fact of high seismic intensity there, we investigate the dynamic response rules of a shallow-buried loess tunnel and its slope under the action of seismic waves with different intensities. Through large-scale shaking table model tests,we successfully analyze the characteristics and process of the destabilization of tunnels and slopes, and propose valuable suggestions regarding the reinforcement parts of a tunnel for reducing seismic damage. The results show that the main seismic damage on a slope include the failure of the sliding surface between the top and foot and the stripping of the soil around the tunnel entrance, while the damage on a tunnel is mainly manifested as the seismic-induced subsidence at the portal section and the cracking deformation at the joint areas. Finally,we propose that the "staggered peak distribution" phenomenon of the maximum acceleration values at the vault and inverted arch area can be considered as a criterion indicating that the tunnel enters into the threshold of dynamic failure.
关键词:  Loess  High slope  Shallow-buried tunnel  Dynamic response
DOI:10.19743/j.cnki.0891-4176.202004006
分类号:
基金项目:This project is sponsored by National Natural Science Foundation of China(51968041,41562013), Foundation of A Hundred Youth Talents Training Program of Lanzhou Jiaotong University, Gansu Provincial Science and Technology Porgram (18YF1GA055).
Dynamic Response of Shallow-Buried Tunnels Traversing High Loess Slopes
SUN Wen1,2,3, LIANG Qingguo1,2, WANG Lili4, CAO Xiaoping2
1.National Demonstration Center for Experimental Civil Engineering Education, Lanzhou Jiaotong University, Lanzhou 730070, China;2.School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;3.Gansu Architectural Science Research Institute Co., Ltd., Lanzhou 730070, China;4.Key Laboratory of Loess Earthquake Engineering of China Earthquake Administration, Lanzhou 730000, China
Abstract:
Considering the existence of numerous shallow-buried tunnels traversing high slopes in the loess area in western China and the fact of high seismic intensity there, we investigate the dynamic response rules of a shallow-buried loess tunnel and its slope under the action of seismic waves with different intensities. Through large-scale shaking table model tests,we successfully analyze the characteristics and process of the destabilization of tunnels and slopes, and propose valuable suggestions regarding the reinforcement parts of a tunnel for reducing seismic damage. The results show that the main seismic damage on a slope include the failure of the sliding surface between the top and foot and the stripping of the soil around the tunnel entrance, while the damage on a tunnel is mainly manifested as the seismic-induced subsidence at the portal section and the cracking deformation at the joint areas. Finally,we propose that the "staggered peak distribution" phenomenon of the maximum acceleration values at the vault and inverted arch area can be considered as a criterion indicating that the tunnel enters into the threshold of dynamic failure.
Key words:  Loess  High slope  Shallow-buried tunnel  Dynamic response