深基坑降水沉降计算土体弹性参数取值方法探讨

梁发云; 贾亚杰; 邓航; 姚笑青

doi:10.11779/CJGE2017S2008

深基坑降水沉降计算土体弹性参数取值方法探讨

Discussions on elastic parameters of soil for land subsidence caused by decompression of confined aquifer in deep excavation

摘要

摘要: 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与抽水试验反算得到的剪切模量及土体小应变初始剪切刚度之间的关系,采用土体小应变模型（HSS）分析-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。

Abstract: The relationships among the soil shear modulusobtained by oedometer tests, by pumping tests and the initial shear modulusof hardening soil small (HSS) model for soft soil under sensitive circumstance in Shanghai and Tianjin are studied. The HSS model is used to fit the relationship between shear modulus ratio and shear strain. It is found that the soil strain caused by excavation dewatering under sensitive circumstance is about 0.1%~0.5%. The shear modulus of can be adopted to estimate soil deformation. Taking the deep foundation pit dewatering projects of Hangzhong Road Station of Shanghai Metro Line No. 10 and Pengyuepu Pumping Station as examples, the deformation calculated by adopting the elastic modulus determined by the proposed method is close to that by adopting the parameter obtained from in-suit pumping tests, and thus the rationality of the proposed method is verified.

HTML全文

参考文献(9)

施引文献

资源附件(0)