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

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (15) : 210-218.

论文

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

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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

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摘要

地铁盾构隧道施工会造成地基土体扰动，由此产生的土体刚度退化会影响地基土体的振动响应。为考虑近场施工扰动对后期隧道系统动力响应的影响，本文提出了一种静力有限元和2.5维动力有限元联合的求解方法。首先，基于饱和土的波动方程，推导了以土骨架位移 u 和孔隙水压力 p表示的 u-p 格式的饱和土2.5维有限元表达式，结合拉伸函数构建完美匹配层边界，建立 u-p 格式下饱和地基下的2.5维有限元-完美匹配层动力模型。其次，采用静力有限元模拟隧道施工，确定由于盾构隧道施工扰动引起的地基土体剪切刚度退化值。最后，将退化的土体剪切刚度代入2.5维动力模型，实现施工扰动对系统动力响应的影响分析。基于该方法，探讨不同地基土体和隧道形状时盾构隧道开挖施工对地表振动响应的影响。结果表明：隧道施工会增大地表土体的竖向振动位移，距离隧道越近，隧道施工引起的地表竖向位移增量越大，最大值出现在隧道中心线处。圆形和矩形隧道下的振动响应小于椭圆形隧道。

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.

导出引用

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[J]. Journal of Vibration and Shock, 2023, 42(15): 210-218

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