小净距上下重叠地铁隧道地基土车致动力响应特征研究

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (22) : 223-227.

论文

有智慧1，马龙祥2，农兴中1，张超2

作者信息 +

Dynamic response characteristics of foundation soil surrounding small-spaced vertical-overlapped tunnels excited by metro trains

YOU Zhihui1，MA Longxiang2，NONG Xingzhong1，ZHANG Chao2

Author information +

文章历史 +

摘要

小净距上下重叠地铁隧道的地基土在列车的长期运营振动作用下相较于一般地铁隧道的地基土更易出现长期变形。在此背景下，采用2.5维数值方法，对成都地铁6号线某小净距上下重叠隧道区段地基土在上下侧隧道单独行车及上下侧隧道同时行车情况下的动力响应进行了计算及分析，明确了该区段地基土在不同列车荷载作用下的动力响应特征。分析结果表明：在近隧道位置，地铁列车运行引发的垂向正应力往往比其他应力分量更大，但列车引发的沿线路纵向的切应力也具有较大的量值；上侧隧道行车会造成下侧隧道地基土产生相当量值的主压应力；相比于单一列车到达，上下侧隧道中列车同时到达会显著增大地基土的动应力量值；对考虑的小净距上下重叠地铁隧道地基土在运营期间的长期变形及稳定性应给予足够的重视。

Abstract

Under metro train loads, the foundation soil surrounding small-spaced vertical-overlapped metro tunnels is more likely to incur long-term deformation than that surrounding the common metro tunnel.With this context, the dynamic responses of the foundation soil surrounding small-spaced vertical-overlapped tunnels at a section of Chengdu Metro Line 6 was computed and analyzed by the 2.5-dimensional (2.5D) numerical method, and the dynamic response characteristics of the foundation soil under different train loads were clarified.The analysis results show that:① in the foundation soil near the tunnel, the vertical normal stress induced by the moving metro train is generally greater than other stress components, but the longitudinal shear stress induced by the moving train also has a considerable magnitude;② the metro train that operates in the upper tunnel will cause considerable principal compressive stress in the foundation soil of the lower tunnel;③ compared with the arrival of a single train, the simultaneous arrival of two trains operating in both the upper and lower tunnels will significantly increase the dynamic stress in foundation soil; ④ sufficient attention should be paid to the long-term deformation and stability of the foundation soil of small-spaced vertical-overlapped metro tunnels during their operation. 

导出引用

有智慧1，马龙祥2，农兴中1，张超2. 小净距上下重叠地铁隧道地基土车致动力响应特征研究[J]. 振动与冲击, 2020, 39(22): 223-227

YOU Zhihui1，MA Longxiang2，NONG Xingzhong1，ZHANG Chao2. Dynamic response characteristics of foundation soil surrounding small-spaced vertical-overlapped tunnels excited by metro trains[J]. Journal of Vibration and Shock, 2020, 39(22): 223-227

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