不同围护结构形式的基坑变形特性及造价研究
Research on Foundation Pit Deformation Characteristics and Cost of Different Forms of Enclosure Structures
张荣宽 1汤勇2
作者信息
- 1. 华设设计集团股份有限公司,江苏南京 210029
- 2. 江苏禹衡工程质量检测有限公司,江苏盐城 224014
- 折叠
摘要
基于苏州某地铁换乘通道狭长基坑工程变形监测,对SMW工法桩、钻孔咬合桩、地连墙3种围护结构的深层水平位移、地表沉降、每延米造价进行对比分析.研究表明,围护结构的深层水平位移最大值、地表沉降最大值与围护结构刚度成反比,且随着围护结构刚度的增加,深层水平位移最大值、地表沉降最大值的减小趋势变缓;在深层水平位移及地表沉降相差不大的情况下,与Φ800@600咬合桩、600 mm厚地下连续墙相比,Φ850@600 SMW工法桩(型钢隔一插二)更具有经济性.Φ1000@800咬合桩围护的深层水平位移和地表沉降相比Φ800@600咬合桩明显减小,但每延米造价增加较少,当周边环境条件要求较高时,可考虑采用Φ1000@800咬合桩.研究结果对后续类似工程有重要的指导意义.
Abstract
Based on the deformation monitoring of a narrow foundation pit project for a subway transfer passage in Suzhou,a comparative analysis was conducted on the deep horizontal displacement,surface settlement,and cost per linear meter of three types of retaining structures:SMW piles,interlocking piles,and diaphragm walls.Research has shown that the maximum deep horizontal displacement and surface settlement of the enclosure structure are inversely proportional to the stiffness of the enclosure structure,and as the stiffness of the enclosure structure increases,the decreasing trend of the maximum deep horizontal displacement and surface settlement becomes slower.When the deep horizontal displacement and surface subsidence are close,compared with Φ800@600 bored piles and 600 mm thick underground continuous walls,Φ850@600 SMW piles(steel sections with one insertion and two insertions)are more economical.The deep horizontal displacement and surface settlement of Φ1000@800 interlocking pile are significantly decreased compared with Φ800@600 interlocking pile,but the cost per linear meter is slightly increased.When the requirements of the surrounding environment are strict,it can be considered to use the Φ1000@800 interlocking pile.The research results can provide important guiding significance for similar projects in the future.
关键词
基坑围护/地表沉降/深层水平位移/经济性Key words
foundation pit enclosure/surface subsidence/deep horizontal displacement/economy引用本文复制引用
出版年
2024
NETL
NSTL
万方数据