Effects of disturbance during tunnel construction on dynamic response of tunnel-soil body system during tunnel construction period
SU Guangbei1,2, DI Honggui1,2, ZHOU Shunhua1,2, GUO Huiji2,3, ZHANG Xiaohui1,2
1.Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongii University, Shanghai 201804, China;
2.Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongii University, Shanghai 201804, China;
3.The Technical Center of Shanghai Shentong Metro Group Co., Ltd., Shanghai 201103, China
Abstract：Construction of subway tunnel will cause soil disturbance, and the resulting soil stiffness degradation impacts the future foundation soil vibration. Therefore, to consider the influence of construction disturbance on the dynamic response of tunnel systems, this paper develops a novel hybrid modeling approach, consisting of a static finite element and a 2.5D dynamic finite element. Firstly, based on the wave equation of saturated soil, the u-p (representing displacement of soil skeleton u and pore water pressure p) format saturated soil 2.5-dimensional finite element expression is derived. Combined with the stretch function to construct the perfectly matched layer (PML) boundary, the u-p format 2.5-dimensional finite element-perfect matching layer method of saturated soil is proposed. Secondly, finite element software is used to establish a tunnel construction model to determine the degraded value of the soil shear stiffness caused by the disturbance of the tunnel construction. Finally, the degraded soil shear stiffness is substituted into the 2.5-dimensional dynamic calculation model to realize the analysis of the influence of construction disturbance on the system dynamic response. Based on this calculation method, the influence of different foundation soils and tunnel shapes on the vibration response of the foundation surface is discussed. The results show that the tunnel construction will increase the vertical vibration displacement of the ground surface. The closer to the tunnel, the greater vertical displacement of the ground surface caused by the tunnel construction, and the maximum value appear at the centerline of the tunnel. The vibration response of circular and rectangular tunnels is weaker than that of elliptical tunnels.
苏光北1,2，狄宏规1,2，周顺华1,2，郭慧吉2,3，张小会1,2. 隧道施工期扰动对运营期隧道-土体系统动力响应的影响分析[J]. 振动与冲击, 2023, 42(15): 210-218.
SU Guangbei1,2, DI Honggui1,2, ZHOU Shunhua1,2, GUO Huiji2,3, ZHANG Xiaohui1,2. Effects of disturbance during tunnel construction on dynamic response of tunnel-soil body system during tunnel construction period. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(15): 210-218.
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