某基坑出现流砂局部失稳原因分析及处置
摘要:针对深基坑工程常常出现流砂现象,结合北京某深基坑工程案例对因流砂引起的边坡局部失稳原因进行分析及应对措施进行研究。研究表明:影响流砂现象的因素较多,主要是土的颗粒级配、结构、埋藏条件及施工过程质量问题;应对流砂处理思路:①阻断动水压力的渗透路径,隔断基坑外侧和内侧的水力联系;如止水帷幕、钢板桩、墙后填碎石或卵石等;②降低基坑内外水头差,降低水力坡降,如轻型井点降水、导流管导水明排抽水等。通过对工程案例分析,因地制宜地解决流砂,对类似工程有所借鉴。
Abstract:Aiming at the phenomenon of flowing sand in deep foundation pit engineering,we study the reason that the local instability of slope caused by quicksand and the measures to deal with it according to the concrete case of a deep foundation pit in Beijing.The study shows that there are a lot of factors which influence the flow sand phenomena,such as grain composition,structure,burial condition and quality problem of the process of construction.The first is blocking the seepage path of hydrodynamic pressure,such as waterproof curtain,steel sheet pile,gravel or pebbles after the wall and so on.The second is reducing the head difference of the inside and outside and the hydraulic slope,such as light well dewatering,waterway drain with draft tube.Through analyzing the concrete engineering case,it can solve the flow sand with adjusting measures to local conditions as well as learning for the similar project.
中文标题：
某基坑出现流砂局部失稳原因分析及处置
Analysis and Processing Scheme of Local Instability for Flowing Sand in Some Foundation Pit
作者：
张凯,冯科明
Zhang Kai,Feng Keming
作者简介:张凯,男,1987年生,汉族,安徽人,毕业于北京工业大学,硕士,主要对地基处理及基坑工程方面的研究。E-mail:kaizhang073@163.com
通讯地址：
北京城建勘测设计研究院有限责任公司, 北京 100101
BeijingUrbanConstructionExploration8-SurveyingDesignInstituteCo.,Ltd.Beijing100101,China
中图分类号:TU441.35
doi:10.3969/j.issn.1007-2993.2017.02.011
出版物：岩土工程技术
收稿日期:2017-01-16
网络出版日期:2021-07-06
关键词:深基坑工程,流砂,失稳分析,处理思路
Key words:deep foundation pit engineering,quicksand,instability analysis,processing idea
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