北京首例高速公路下穿河道施工风险管控研究  

Risk Management and Control of the First Expressway Tunnel Under the River Crossing in Northern China

作　　者：孙玉辉[1] 姚添宝 王金明[1] 杨可可 Sun Yuhui;Yao Tianbao;Wang Jinming;Yang Keke(BGI Engineering Consultants Ltd.,Beijing 100038,China)

机构地区：[1]北京市勘察设计研究院有限公司,北京100038

出　　处：《城市勘测》2021年第4期184-186,190,共4页Urban Geotechnical Investigation & Surveying

摘　　要：本工程为北京地区首次以高速公路形式下穿河道的工程,工程水文地质条件复杂,承压水水头较高,基坑开口线较大,属于超宽深大一级等级基坑,基坑支护采用多种支护方式相结合。施工前针对自身特点进行了风险识别,人工填土、粉砂、细砂等地层开挖期间的渗水流砂,第3、4、5层承压水的治理,多种支护结构交接处的应力集中部位,二级基坑上部的施工便道等均是施工中风险把控要点。施工中加强监测和巡视力度,直到基坑回填完毕,本工程周边环境及围护结构自身变形均在控制值范围内,风险可控。本工程基坑支护方式及施工过程中风险管控措施可行有效,为北京地区以后类似工程提供实例类比参考依据。This project is the first time in Beijing area in the form of expressway passing through river courses.The project has complex engineering hydrogeological conditions.The project is high pressure water head,which has large opening line of foundation pit,belongs to first grade foundation pit.Combination of various supporting methods,before construction,risk identification is carried out according to its own characteristics,geological conditions,confined water,multiple support structure junction,construction road,all of the key point of risk in construction,strengthening monitoring and inspection in construction,deformation stability of surrounding environment and enclosure structure,the risk control measures in foundation pit support and construction process are feasible and effective,providing an example analogy reference for similar projects in the Beijing area.

关 键 词：首例承压水 多种支护形式 风险识别 风险管控 

分 类 号：TV551.42[水利工程—水利水电工程]