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为了研究各因素在盾构法施工中对地表沉降的影响程度,基于敏感性分析原理,针对一地铁盾构实例,选取土体弹性模量、土仓压力、地下水等3个影响地表沉降的因素,通过变化某一基准参数,让其余影响因素固定,分析研究了盾构施工引起地表沉降对各因素的敏感性。结果如下:弹性模量提高10%时,地表累积最大沉降量可减小15%～20%;在地下水存在的情况下,地表沉降显著增大;而对于砂性土而言,土仓压力越高地表沉降值略有增加。研究结果表明:地表沉降对穿越地层的弹性模量和地下水比较敏感,而对土仓压力敏感性较小。
In order to study the influence of various factors on the settlement of the earth’s surface during the shield construction, based on the principle of sensitivity analysis, aiming at a metro shield example, three factors that affect the settlement of the earth’s surface, such as soil elastic modulus, soil pressure and groundwater, By changing a certain reference parameter, the remaining factors are fixed, and the sensitivity of the settlement to the various factors caused by the shield construction is analyzed and studied. The results are as follows: When the elastic modulus is increased by 10%, the maximum surface subsidence can be reduced by 15% ~ 20%; under the condition of groundwater, the surface subsidence significantly increases; for sandy soil, High surface subsidence value increased slightly. The results show that surface subsidence is more sensitive to the elastic modulus and groundwater flowing through the formation, but less sensitive to the pressure in the soil compartment.