多种支护型式在软土场地基坑支护设计中的应用  

Application of Multiple Support Forms in Foundation Pit Support in Soft Soil

作　　者：肖向阳 XIAO Xiang-yang(Guangzhou Jiacheng Zhixin Construction Management Co.,Ltd,Guangzhou 511400)

机构地区：[1]广州嘉诚至信建设管理有限公司,广州511400

出　　处：《广州建筑》2024年第1期47-50,共4页GUANGZHOU ARCHITECTURE

基　　金：住房和城乡建设部科学技术计划项目(2022-K-039)。

摘　　要：为针对广州南沙区某软土深基坑工程设计出安全经济的基坑支护方案,采用理正深基坑7.0软件,针对基坑各支护区段及开挖工况进行单元计算,并对比施工过程中的监测数据。计算结果表明,对于本项目跨度较小的一层地下室基坑,在周边场地有限的情况下,采用围护桩+内支撑+坑内加固的支护方案,基坑最大水平位移可控制在40 mm以内,且可以针对基坑变形控制要求采用多种围护结构的组合;对于局部加深的坑中坑区域,采用重力式水泥土墙+内支撑支护方案,最大水平位移可控制在20 mm以内。监测数据表明,本项目基坑综合采用多种支护型式后,支护结构顶部水平及竖向位移最大分别为28.7 mm和17.7 mm,土体深层水平位移最大约13.9 mm,临近建筑物最大沉降约11.4 mm,均处于规范规定范围内。理论计算及监测数据表明,基坑处于安全状态,取得了良好效益。In order to design a safe and economical foundation pit support scheme for a deep foundation pit project in soft soil in Nansha District,Guangzhou,the Lizheng Deep Foundation Pit 7.0 software was taken to conduct unit calculation for each support section and excavation condition of the pit,and the monitoring data during the construction process was compared.The calculation results indicate that for one story basement foundation pit with a small span in this project,when the surrounding space is limit,the maximum horizontal displacement of the pit could be controlled within 40mm if the support scheme was taken where enclosure piles are combined with internal support and pit reinforcement,and that different kinds of enclosure piles could be combined to meet the pit deformation requirements.Gravity cement soil wall combined with internal support is adopt to"Pit-in-Pit"where the pit is deepen,and the maximum horizontal displacement can be controlled within 20mm.The monitoring data shows that after adopting multiple support forms,the maximum horizontal and vertical displacement at the top of the enclosure piles is respectively 28.7mm and 17.7mm,and that the maximum horizontal displacement of the deep soil layer is around 13.9mm,and that the maximum subsidence of adjacent buildings is around 11.4mm,all of which stay within specification range.Theoretical calculation and monitoring data show that the pit is in a safe state,thusachieving benefits.

关 键 词：基坑支护 软土 多种支护型式 

分 类 号：TU432[建筑科学—岩土工程]