| 张永雨,孙玉永.河南某基坑失稳原因分析及应急方案[J].矿产勘查,2021,12(5):1250-1255 |
| 河南某基坑失稳原因分析及应急方案 |
| Analysis and emergency plan for instability of a foundation pit in Henan |
| 投稿时间：2020-11-08 |
| DOI： |
| 中文关键词: 基坑工程 失稳破坏 管桩施工 时空效应 折减系数 |
| 英文关键词: foundation pit failure construction of the pipe pile time-space e ect reduction coe cient |
| 基金项目:本文受安徽省教育厅自然科学研究重点项目(KJ2019A0705)资助。 |
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| 中文摘要: |
| 土层强度指标是基坑支护设计的重要参数，取值不当将影响支护设计的合理性，甚至造成工程事故。本文以某失稳基坑为工程背景，通过现场调研、土工试验、计算分析、工程经验等方法，提出地勘资料不准确、地基施工、超挖、支护不及时等是造成基坑失稳的主要原因。通过对比分析，估算出土层受施工影响后抗剪强度和承载力的折减系数，并针对性提出了应急方案，为类似基坑工程的设计和施工提供借鉴。 |
| 英文摘要: |
| The strength indexes of soil are important parameters for designing the foundation pit If the strength indexes of soils are inaccurate,the rationality of retaining structures will be a ected,even cause project accidents In this paper,based on an instability accident of a foundation pit,the reasons that caused the accident have been analyzed though eld investigation,geotechnical test,computational analysis and engineering practices It found that inaccurate information of geological survey,improper construction,over-excavation and delay of supporting are the main reasons causing the accidents By comparing analysis,the reduction coe cients of the shear strength and bearing capacity of soil layer a ected by construction is estimated Meanwhile,the emergency plan is proposed to remedy the situation,which provides reference for the design and construction of similar foundation pit |
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