兰州软土深基坑降水引起的地表沉降计算方法研究  

Study on Calculation Method of Ground Settlement Caused by Dewatering of Deep Foundation Pit in Soft Soil in Lanzhou

作　　者：张建明 ZHANG Jianming(China Railway 21st Bureau Group 2nd Engineering Co.Ltd.,Lanzhou Gansu 730000,China)

机构地区：[1]中铁二十一局集团第二工程有限公司,甘肃兰州730000

出　　处：《铁道建筑技术》2024年第11期88-92,共5页Railway Construction Technology

基　　金：中铁二十一局集团有限公司科技开发项目(2023B-8)。

摘　　要：随着建筑物朝更高、更深方向的发展,深基坑的施工受到工程技术人员广泛关注。基坑降水容易出现坑壁坍塌、基坑周边地表沉降过大等问题,这些问题不但影响施工安全,也给周边邻近设施带来安全隐患。以兰州某一粉质黏土软土深基坑为例,基于修正疏干区土层计算深度提出了一种基坑降水引起地表沉降的简化算法,并通过现场监测、规范方法计算和数值模拟等方法对提出的简化算法可靠性进行了验证。结果表明:对简化算法所得计算值、现场监测值和规范方法计算所得结果进行比较,得出简化算法所得结果比规范方法计算结果更接近现场监测值,验证了简化算法的可行性,这可为兰州地区类似深基坑降水引起地表沉降的计算提供参考。With the development of buildings towards higher and deeper directions,the construction of deep foundation pits has received extensive attention from engineering and technical personnel.The dewatering of foundation pit is prone to problems such as pit wall collapse and excessive ground settlement around foundation pit,which not only affect the construction safety,but also bring security risks to the surrounding facilities.Taking a deep foundation pit in soft soil in Lanzhou as an example,a simplified algorithm for ground settlement caused by foundation pit dewatering is proposed based on the calculated depth of soil layer in the modified dewatering area,and the reliability of the proposed simplified algorithm is verified by field monitoring and numerical simulation.The results showed that:the calculated values obtained by the simplified algorithm were compared with the on-site monitoring values and the results obtained by the standardized method,it was found that the results obtained by the simplified algorithm were closer to the on-site monitoring values than those obtained by the standardized method,which verified the feasibility of the simplified algorithm.This can provide reference for the calculation of ground settlement caused by similar deep foundation pit dewatering in Lanzhou area.

关 键 词：基坑降水 沉降计算方法 软土基坑 

分 类 号：TU463[建筑科学—结构工程] P642.26[建筑科学—土工工程]