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本文以盾构隧道施工引起的地面沉降为对象,研究邻近地表建筑物的存在对其发生发展的影响。以具体工程为依托,以实际工程监测和数据分析为主要手段,研究得出:在有邻近地表建筑物存在时,地表沉降曲线形状与无建筑物存在时相似,均符合高斯曲线的形式;区别在于有建筑物存在时,地表沉降曲线的峰值要比无建筑物存在时小,曲线的反弯点离隧道轴线的距离要比无建筑物存在时远;说明了地表建筑物的存在以及建筑物基础与地基相互作用提高了盾构隧道穿越地基土层的刚度,对盾构隧道引起的地表沉降有控制作用。在盾构隧道施工及监测的过程中,可依据该特点合理布设有无地表建筑物存在情况下的监测测点,并对盾构隧道引起的建筑物及地标开裂现象做出合理的预测。
In this paper, the ground subsidence caused by the construction of shield tunnel is taken as an object to study the impact of the existence of nearby surface buildings on its occurrence and development. Based on the concrete engineering and the actual engineering monitoring and data analysis as the main means, the study shows that: when there is a nearby surface building, the shape of the surface subsidence curve is similar to that of the building without any building, all conform to the Gaussian curve form; In the presence of a building, the peak value of the surface subsidence curve is smaller than when no building exists, and the distance between the inflection points of the curve and the tunnel axis is far away from the tunnel axis. This shows the existence of the surface buildings and the buildings The interaction between foundation and foundation improves the rigidity of shield tunnel through soil foundation and controls ground settlement caused by shield tunnel. During the construction and monitoring of the shield tunnel, the monitoring points in the absence of the surface buildings can be rationally arranged according to the characteristics, and a reasonable prediction of the cracking of the buildings and the landmarks caused by the shield tunnels can be made.