富水砂层强喀斯特地质条件下地下连续墙高效成槽联合施工技术研究

Research on Efficient Trenching Joint Construction Technology for Underground Continuous Wall under Water-rich Sand Layer and Strong Karst Geological Conditions

地下连续墙因刚度大、整体性好、防渗性强等优点成为安全可靠的深大基坑支护结构,被广泛应用于城市地下空间开发中。文章以广州市某项目基坑工程为例,重点介绍了在邻近地铁、房屋建筑、市政道路等特殊环境及富水砂层强喀斯特地质条件下,双轮铣与旋挖引孔、液压抓斗及水泥土搅拌桩辅助高效成槽联合施工技术的应用,通过实际运用,既保证了施工进度,又保证了成槽质量与施工安全,可为同类工程施工提供借鉴。

Underground continuous wall has become a safe and reliable support structure for deep and large foundation pits due to its advantages of large rigidity,good integrity and strong impermeability,and are widely used in urban underground space development.Taking the foundation pit engineering of a project in Guangzhou as an example,this paper focuses on the application of the efficient trenching joint construction technology assisted by double-wheel milling and rotary drilling,hydraulic grab and cementsoil mixing piles in the special environment near subways,housing buildings,municipal roads and under water-rich sand layer and strong karst geological conditions.Through practical application,it not only ensures the construction progress,but also ensures the trenching quality and construction safety,which can provide reference for similar engineering construction.