Calculation Method of Disturbed Settlement of Buried Structures Considering Side Wall Friction
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摘要: 大体积地下埋置结构除承受下部地基支撑外，侧壁与土体的大面积接触将产生显著的摩擦效应，由此导致的结构附加变位有待重点关注.以外部施工扰动引起的地层及其内部既有结构物沉降为研究目标，在考虑埋置结构伴随下部地层出现下沉的基础上，观察侧壁摩擦对结构沉降的影响，从而得到更为精确的大体积结构物竖向扰动变位计算结果.借助盾构隧道下穿地下行车通道开挖这一典型工程案例，首先基于Pasternak地基模型并结合两阶段分析方法，建立通道结构在开挖扰动作用下的力学平衡方程，进而在结构侧壁与土体间引入Clough-Duncan双曲线模型，进一步建立在结构-地层竖向摩擦作用下的荷载平衡公式，描述摩擦力对行车通道沉降的附加效果，并利用有限差分方法对方程进行循环迭代求解，最后通过实际工程案例验证该计算方法的适用性.结果表明，盾构隧道下穿开挖扰动带来埋置结构与两侧地层不同程度的沉降变形，由此形成的行车通道与侧面土体沉降差在结构侧壁产生显著的剪切应力，通道侧壁与土体较大的接触面积使地层沉降带动结构物继续下沉，软弱土地层中摩擦力对应的计算结果增量高达30%以上.因此，对于大体积地下埋置结构而言，由侧壁摩擦导致的结构竖向附加变位不可忽略.Abstract: In addition to the lower foundationsupport,the large volume buried structure bears significant friction effect due to the large-area contact between the side wall and the soil,the additional structural displacement caused by which needs to be focused on.Taking the settlement of the stratum and its internal structures induced by external construction disturbances as the research object,the further effect of side wall friction on the structure settlement was investigated with consideration of the buried structure subsidence with the underlying stratum,and more accurate vertical disturbance displacement calculation results were obtained according to the characteristics of large-volume buried structures.With the typical engineering case of the shield tunnel excavation underpassing the underground passageway,the mechanical equilibrium equation of the passageway structure affected by the excavation disturbance was established based on the Pasternak foundation model and the two-stage analysis method.Then,the Clough-Duncan hyperbolic model was introduced between the side wall of the structure and the soil,and the load balance formula under the vertical friction between the structure and the stratum was further established to describe the additional effect of friction on the passageway settlement.The equation was iteratively solved by the finite difference method.Finally,the applicability of the calculation method was verified by practical engineering.The results show that the excavation disturbance of shield tunnel brings different settlement between the buried structure and the surrounding stratum,and the resulting settlement difference between the passageway and the side soil generates significant shear stress in the side wall of the structure.The large contact area between the passageway side wall and the soil makes the structure continue to sink with the stratum,and the settlement calculation result corresponding to the friction in the soft soil stratum increases by more than 30%.Therefore,the additional vertical displacement caused by side wall friction cannot be ignored in large-volume buried structures.
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