摘要
以深圳深厚填土地层条件下某桩锚支护形式的深基坑工程为例,探讨了在基坑支护结构施工、土方开挖、地下结构施工直至基坑回填整个过程中的监测数据变化趋势,针对基坑支护结构的水平位移、沉降位移、深层水平位移、锚索应力以及地下水位等监测项目进行了规律分析和总结归纳。监测结果表明:在深厚填土区域采用桩锚支护的形式,支护结构水平位移是随着基坑开挖逐渐增大的;水平位移在支护结构顶部最大,随着深度增加,水平位移逐渐减小;在整个过程中锚索的应力有轻微的减少。即使设置了止水帷幕,随着土方开挖的进行,监测的地下水位逐渐下降、地表沉降逐渐增大,表明在深厚填土区域应做好地下水位下降导致地面沉降较大的应急预案,并对基坑顶部的管线、浅基础等沉降敏感建(构)筑物做好相应的处理措施。
Take the deep foundation pit of pile-anchor support structure engineering in Shenzhen as an example,this paper discussed the growing trend of the monitoring data during the support structure is constructing,earth excavation,underground construction,and earthwork backfilling.The settlement and horizontal displacement of support structure,axial force of anchor line,and the underground water level laws are summarized and analyze.The monitoring results show that the settlement of support structure is increase during the excavation of foundation pit,the maximum settlement is at the top of the pile,the settlement is decrease as the depth increases,and the axial force of anchor line is decrease slightly.Although the water curtain is set,the underground water drops,the ground surface settlement increase with earth excavation.The results show that it is necessary to prepare emergency plan and securing supports of pipes and building foundations under the condition of deep fill stratum.
作者
吴旭彬
Wu Xubin(Shenzhen Comprehensive Geotechnical Engineering Investigation&Design Co.,Ltd.Shenzhen 518172,China;Shenzhen Longgang Geology Bureau Shenzhen 518172,China)
出处
《广东土木与建筑》
2020年第9期72-75,80,共5页
Guangdong Architecture Civil Engineering
基金
广东省深圳市地质局地质工程院士工作站专项经费资助项目(2013B090400025)。
关键词
深厚填土
深基坑
桩锚支护
全过程
基坑监测
锚索应力
沉降
deep fill stratum
deep foundation pit
pile-anchor support
overall process
foundation monitoring
anchor cable stress
settlement