堆载引起临近地铁隧道的转动与错台变形计算

doi:10.13722/j.cnki.jrme.2017.1576

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摘要采用Boussinesq解求出地面堆载工况下隧道轴线处的附加应力，提出一个以剪切错台为主、刚体转动为辅的隧道变形模式，结合最小势能原理推导出隧道纵向变形量、环间错台量、环间转角和环间剪切力的计算公式。通过工程实例分析，将新方法与实测数据和弹性地基梁法进行比较，验证了新方法的有效性。并研究刚体转动效应、剪切错台效应、堆载数值、隧道埋深和隧道偏移距离对隧道纵向变形量的影响。研究结果表明：在地面堆载工况下，隧道变形以剪切错台模式为主。随着刚体转动效应比例系数j增大，隧道沉降量在一定范围内减小；随着堆载数值增大，隧道纵向沉降量增大，沉降范围没有明显变化；隧道沉降量随着隧道埋深的减小而增大；随着隧道偏移距离增大，隧道沉降量减小，隧道水平位移则先增大后减小。

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	魏新江1
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	洪文强1
	魏纲2
	俞国骅3

关键词 ：隧道工程, 盾构隧道, 刚体转动效应, 剪切错台效应, 地面堆载, 沉降量

Abstract：Boussinesq?s solution is adopted to calculate the additional stress at the tunnel axis caused by ground stack load. It is proposed that compared with the rigid body rotation，the shear dislocation plays a primary role for tunnel deformation modes. The formulas of the longitudinal deformation，dislocation displacement at segment joint，rotation angle at segment joint and shear force at segment joint of the tunnel are deduced according to the principle of minimum potential energy. The calculated results from the proposed method are compared with the data from the elastic foundation beam method and experiment measurement，which validates the proposed method. The effects of the rigid body rotation，shear dislocation，heap load，buried depth and the offset distance of the tunnel on the longitudinal deformation are studied. The deformation of the tunnel under ground stack load is dominated by the mode of shear dislocation. The larger the ratio coefficient j of the rigid body rotation is，the smaller the settlement of the tunnel is. The larger the load is，the larger the longitudinal settlement of the tunnel is，and the range of settlement changes little. The shallower the buried tunnel is，the larger the settlement of the tunnel is. The larger the offset distance is，the smaller the settlement of the tunnel is，and the horizontal displacement of the tunnel increases first and then decreases.

Key words： tunneling engineering shield tunnel rigid body rotation effect shearing dislocation ground stack load settlement

引用本文:

魏新江1，2，洪文强1，魏纲2，俞国骅3. 堆载引起临近地铁隧道的转动与错台变形计算[J]. 岩石力学与工程学报, 2018, 37(5): 1281-1289.
WEI Xinjiang1，2，HONG Wenqiang1，WEI Gang2，YU Guohua3. Rotation and shearing dislocation deformation of subway tunnels due to adjacent ground stack load. , 2018, 37(5): 1281-1289.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.1576 或 http://www.rockmech.org/CN/Y2018/V37/I5/1281

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