地下水位及地层渗透系数对基坑抗浮影响研究  

Study on the Influence of Groundwater Level and Stratum Permeability Coefficient on Foundation Pit

作　　者：陈昭阳 李敏[2] 高江林 赵一行 詹刚毅[4] 石钰锋[1] Chen Zhaoyang;Li Min;Gao Jianglin;Zhao Yixing;Zhan Gangyi;Shi Yufeng(Jiangxi Key Laboratory of Geotechnical Infrastructure Safety and Control,East China Jiaotong University,Nanchang 330013,China;China Railway 18th Bureau Group Fifth Engineering Co.,Ltd.,Tianjin 300459,China;Jiangxi Academy of Water Sciences andEngineering,Nanchang 330029,China;China Railway Shanghai Design Institute Group Co.,Ltd.,Shanghai 200070,China)

机构地区：[1]华东交通大学江西省岩土工程基础设施安全与控制重点实验室,江西南昌330013 [2]中铁十八局集团第五工程有限公司,天津300459 [3]江西省水利科学院,江西南昌330029 [4]中铁上海设计院集团有限公司,上海200070

出　　处：《华东交通大学学报》2022年第1期59-66,共8页Journal of East China Jiaotong University

基　　金：国家地区科学基金项目(51768020);江西省自然科学基金重点项目(20202ACB202005);江西省交通运输厅科技项目(2021Z0004)。

摘　　要：某超深圆形盾构始发井基坑因考虑抗浮及盾构始发安全而进行了坑外降水,但引起周边地层较大沉降,按照要求停止降水并恢复原地下水位。在现场监测基础上,采用理论及数值手段,对高水位下该基坑的抗浮及地层渗透系数对围护结构的影响开展研究。研究表明:在不考虑围护结构与地层间摩擦阻力的情况下,基坑可以依靠围护结构自重抵抗地下水产生的浮力;在相同水位下,基坑围护结构底部所处土层的渗透系数是影响围护结构上浮的主要因素。Due to the consideration of anti-floating and shield launching safety, the foundation pit of an ultra-deep circular shield launching shaft was dewatering outside the pit. However, the surrounding strata settlement was large. The dewatering was stopped and the original groundwater level was restored according to the requirements. In this paper, based on the field monitoring, theoretical and numerical methods were used to study the influence of anti-floating and permeability coefficient of the foundation pit on the retaining structure under high water level. The results show that the foundation pit can rely on the self-weight of retaining structure to resist the buoyancy of groundwater without considering the friction between retaining structure and stratum. Under the same water level, the permeability coefficient of the soil layer at the bottom of the retaining structure is the main factor affecting the uplift of the retaining structure.

关 键 词：抗浮验算 数值分析 圆形基坑 超深基坑 渗流分析 

分 类 号：U452[建筑科学—桥梁与隧道工程]