针对上海和天津软土地区敏感环境下的深基坑降水工程,对比由室内土工试验获得的土体剪切模量G与抽水试验反算得到的剪切模量G?及土体小应变初始剪切刚度0G之间的关系,采用土体小应变模型(HSS)分析0G/G–?关系,指出敏感环境条件下,基坑降水引起土体应变范围约为0.1%~0.5%,可取土体剪切刚度(7)(8)0G=0.25~0.35 G估算土层变形。以上海地铁10号线航中路站和彭越浦泵站基坑工程降水为例,根据所建议的取值方法确定含水层压缩模量计算含水层变形,与采用抽水试验结果计算得到的变形相近,验证了本文建议取值方法的合理性。 Aimed at the deep foundation pit dewatering project in Shanghai and Tianjin soft soil area, the shear modulus G of soil and the inverse initial value of G The relationship between 0G and shear stiffness (0G) is analyzed by using the soil small strain model (HSS). The relationship between 0G / G-? Is analyzed. It is pointed out that under the sensitive environment, the soil strain range caused by foundation pit dewatering is about 0.1% ~ 0.5% Body shear stiffness (7) (8) 0G = 0.25 ~ 0.35 G Estimation of soil deformation. Taking the precipitation of the foundation pit of Hangchow Line 10 and Pengjiaopu Pumping Station in Shanghai Metro Line 10 as an example, the deformation of the aquifer calculated by the compressive modulus of aquifer determined by the proposed method is similar to that calculated by the pumping test. Verify the reasonableness of the method proposed in this paper.