浅部厚层粉性土分布区大面积浅基坑围护工程实践
摘要:浅部厚层粉性土分布区的浅基坑工程，由于围护体系不能有效隔断含水层，致使基坑坑内降水具有三维渗流特性，当土质较差或周边环境复杂时，基坑设计与施工将面临严峻挑战。以上海市崇明区某大面积浅基坑工程为例，探讨了基坑降水与围护结构体系在基坑安全方面的相互关系，据此推出将基坑围护结构、止水帷幕与基坑降水统筹考虑的一体化设计思路。介绍了围护结构、降水管井及悬挂式止水帷幕深度确定的方法和依据，强调了围护方案技术交底的重要性。基坑开挖及监测数据表明，采用悬挂式止水帷幕+坑内管井降水结合放坡或重力式挡墙进行基坑地下水控制与围护的方案是可行的，能够取得良好的工程效果。
Abstract:Due to the fact that enclosure system of shallow foundation pit engineering can not isolate the water-bearing layer effectively in distribution area of shallow buried thick silty soil, the dewatering inside foundation pit shows the characteristic of three-dimensional seepage, and the design and construction of foundation pit face severe challenges especially when the soil quality is poor or the surrounding environment is complex. Taking a large-area shallow foundation pit engineering in Chongming District of Shanghai as an example, the relationship between foundation pit dewatering and enclosure structure system on the safety of foundation pit were discussed. The integrated design idea which considers enclosure structure system of foundation pit, water-stopping curtain and foundation pit dewatering as a whole was put forward. The calculation method and basis on the depth of enclosure structure, tube well and suspended impervious curtain were introduced, and the importance of technical tests on foundation pit supporting plan was emphasized. Foundation pit excavation and monitoring data showed that it is feasible and effective to adopt the scheme of suspended impervious curtain, tube well dewatering inside foundation pit and slope or gravity retaining wall for supporting foundation pit and controlling groundwater.
中文标题：
浅部厚层粉性土分布区大面积浅基坑围护工程实践
Engineering Practice of Large Area Shallow Foundation Pit Support in Distribution Area of Shallow Buried Thick Silty Soil
作者：
朱俊杰
Zhu Junjie
作者简介:朱俊杰，男，1990年生，汉族，上海金山人，大学本科，主要从事岩土工程勘察和基坑围护设计。E-mail：605456681@qq.com
通讯地址：
上海市地矿工程勘察（集团）有限公司，上海 200072
ShanghaiGeologicalEngineeringExploration(Group)Co.,Ltd.,Shanghai200072,China
中图分类号:TU 473
doi:10.3969/j.issn.1007-2993.2022.06.012
出版物：岩土工程技术
收稿日期:2022-05-20
修回日期:2022-08-16
刊出日期:2022-12-08
关键词:粉性土层,基坑围护,止水帷幕,基坑降水
Key words:silty soil,foundation pit support,water-resisting curtain,foundation pit dewatering
文档包含图片数量：图片(8)张
文档包含表格数量：表格(1)个
参考文献：
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