Dynamic characteristics of the underlying soil of subway tunnel under cyclic loading
Liu Zhiqiang1,2 Wang Bo1,2 Wang Fei3 Zhang Yuchi1,2
1. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116，China；
2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China;
3. Jiangsu Huasheng Architectural Design Co., Ltd., Xuzhou 221006, China
With the continuous increase of urban subway construction and operation mileage in China, dynamic stability of the soil around subway tunnel under cyclic load have been attracted much more attention. A single-track circular subway tunnel in silty clay layer was analyzed by using laboratory model test and numerical calculation method, the max-acceleration and settlement deformation in the underlying soil of the tunnel under cyclic load were obtained. The results show that compare with the amplitude of cyclic load, the frequency of cyclic load has a more obvious influence on the attenuation characteristics of the max-acceleration in the underlying soil. The influenced zone of a single-track circular subway tunnel is about 2 times of the tunnel diameter, in which 0.5 times of the tunnel diameter has the most significant influence. The dynamic response of the soil is also affected by the burial depth and diameter of the tunnel. The deeper burial depth and larger diameter of a tunnel have the smaller the dynamic response of the soil and benefit for the safety of the tunnel.
刘志强 王博 王飞 张宇驰. 地铁循环荷载下隧道下卧土体动力特性研究[J]. 土木工程学报, 2020, 53(S1): 194-199.
Liu Zhiqiang Wang Bo Wang Fei Zhang Yuchi. Dynamic characteristics of the underlying soil of subway tunnel under cyclic loading. 土木工程学报, 2020, 53(S1): 194-199.
