填海区人工填土层及地下水对基坑施工导致的不利影响及存在问题  

Adverse effects and existing problems of artificial fill layer and groundwater in reclamation area on foundation pit construction

作　　者：邵恩庆 卢笑 刘世安 张志芹 顾朝杰 SHAO Enqing;LU Xiao;LIU Shian;ZHANG Zhiqin;GU Zhaojie(Qingdao Geologic and Mineral Geotechnical Engineering Co.,Ltd.,Qingdao 266000,Shandong,China)

机构地区：[1]青岛地矿岩土工程有限公司,山东青岛266000

出　　处：《世界地质》2022年第2期394-401,共8页World Geology

基　　金：山东省自然科学基金项目(ZR2020MD028)。

摘　　要：依托青岛地铁安子东站,分析填海区人工填土层的填土成分和地下水对地铁车站基坑安全的不利影响及施工过程中存在的问题。结果显示:①填海区地下水水量丰富,基坑开挖前应加强止水措施,并保证施工质量,才能有效避免基坑涌水、漏水风险;②填海区填土成分较复杂,对基坑施工的围护措施和止水措施的选择和施工都存在较大影响,施工单位在施工时应按照设计要求,保证桩的垂直度和桩间咬合,以提高止水帷幕的效果;③填海区基坑施工过程中,止水措施不当还会引起地下水的氯离子含量变化,施工需采用更高标号混凝土,增加施工成本。Based on Anzidong station of Qingdao metro,the authors determine the filling composition of artificial filling layer and groundwater in the reclamation area,and analyze their adverse effects on the foundation pit safety of metro station and the problems existing in the construction process.The results show that:①the groundwater in the reclamation area is abundant.Before the excavation of the foundation pit,the water stop measures should be strengthened and the construction quality should be guaranteed,so as to effectively avoid the risk of water gushing and leakage of the foundation pit.②The filling composition in the reclamation area is complex,which has a great impact on the selection and construction of retaining measures and water stop measures for the foundation pit construction.During construction,the construction unit shall ensure the verticality of piles and the bite between piles according to the design requirements,so as to improve the effect of water stop curtain.③During the construction of the foundation pit in the reclamation area,improper water stop measures will also cause the change of chloride ion content in groundwater.Higher grade concrete shall be used for construction,which will increase the construction cost.

关 键 词：填海区 基坑 人工填土层 地下水 

分 类 号：TU92[建筑科学—建筑设计及理论] TU753