深基坑多种支撑体系联合应用研究  

Research on the Joint Application of Multiple Supporting Systems for Deep Foundation Pits

作　　者：缪爱伟 MIAO Ai-wei(Shanghai Geological Engineering&Geology Institute Co,Ltd,Shanghai 200072)

机构地区：[1]上海地矿工程勘察有限公司,上海200072

出　　处：《广州建筑》2020年第6期20-26,共7页GUANGZHOU ARCHITECTURE

摘　　要：苏州相城区某深大基坑工程具有面积大、轮廓不规则、挖深多样化、工期紧等特点,提出了分区开挖方案,共分为A区、B区和C区三个区,明确了这三个区的先后开挖顺序。根据场地周边环境情况和基坑开挖深度,采取针对性的围护体系,其中A区采用钻孔灌注桩悬臂的围护形式,B区和C区采用钻孔灌注桩结合一道内支撑的围护形式。对不同类型的支撑体系从经济性、工期、土方开挖等方面进行了对比分析,并根据分析结果对B区和C区采取了针对性的支撑形式,B区采用圆环支撑形式,C区采用桁架支撑形式,提高了土方开挖效率,并节省了工期。根据工程实际监测数据,支撑系统内力在可控范围内,基坑变形较小。圆环撑和桁架体系的联合应用在工程实践中取得了良好的实施效果,可为类似深基坑工程设计和施工提供借鉴。A deep and large foundation pit project in Xiangcheng District,Suzhou has the characteristics of large area,irregular outline,diversified excavation depth,and it’s construction period is tight.According to the characteristics of the foundation pit,a partition excavation plan is proposed,which is divided into A,B and C three areas,the excavation sequence of these three areas is clarified.According to the surrounding environment of the site and the excavation depth of the foundation pit,a targeted enclosure system is adopted.Area A adopts the cantilevered enclosure form of bored piles,and area B,C adopt enclosure form bored piles combined with an internal support.Different types of support systems are compared and analyzed in aspects of economy,construction period,earthwork excavation,etc.Based on the analysis results,targeted support forms are adopted for area B and area C,area B adopts the ring support form,area C adopts the truss support form.The targeted support form improves the efficiency of earth excavation and saves construction time.According to the actual monitoring data of the project,the internal force of the support system is within the controllable range,and the deformation of the foundation pit is small.The combined application of ring support and truss system has achieved good implementation results in engineering practice,which can provide a reference for the design and construction of similar deep foundation pit projects.

关 键 词：深基坑 围护结构 圆环撑 桁架支撑 

分 类 号：TV551.42[水利工程—水利水电工程]