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。
The relationships among the soil shear modulus G obtained by oedometer tests, G' by pumping tests and the initial shear modulus0 G of 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 ratio0 G/G 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 G of 0(0.25(25)0.35)G 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.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2017年第S2期29-32,共4页
Chinese Journal of Geotechnical Engineering
基金
国家重点研发计划课题(2016YFC0800204)
上海市人才发展资金项目(201548)
关键词
基坑降水
HSS模型
地面沉降
剪切模量
压缩模量
excavation dewatering
HSS model
land subsidence
shear modulus
compression modulus
