含漂砂卵砾石深厚覆盖层复合地基处理施工关键技术的研究与应用

Research and Application of Key Technologies in the Construction of Composite Foundation with Deep Overburden of Bleached Sand and Gravel

以硬梁包水电站为依托,针对深厚覆盖层地质条件复杂多变且含巨漂砂卵砾石地层条件,阐述了通过对防渗墙及地下连续墙采用精准施工技术、发泡泥浆护壁工艺、超常规振冲碎石桩填料自动化精确测量、反滤层精准布设施工工艺、振冲桩承载力快速简便检测方法、超深防渗墙防渗单元质量智能融合与辨识关键技术、智能化精确计量超常规振冲碎石桩填料等基础加固和防渗处理方法开展的研究与应用,有效地解决了泥浆漏失和护壁稳定性问题以及超常规碎石桩施工中遇到的技术难题,实现了对超深防渗墙质量的分析和定量评价,降低了防渗体出现隐患的风险,可对差异沉降进行有效管控,对项目施工进度和质量起到了促进作用,所取得的经验可供类似工程参考。

Based on the Yingliangbao Hydropower Project,this paper summarizes the complex and varied geological conditions of deep overburden and the formation with giant bleach sand.Through the precise construction technology of cut-off wall and underground diaphragm wall;foam mud wall protection technology;automatic and accurate measurement of super-standard vibro-crushed stone pile packing;accurate layout construction technology of reverse filter layer;quick and easy detection method of bearing capacity of vibro-crushed stone pile;intelligent integration and identification key technology of quality of ultra-deep cut-off wall impermeable unit;intelligent and accurate measurement of ultra-conventional vibro-crushed stone pile packing and other foundation reinforcement;research and application of intelligent and precise measurement of unconventional vibro-compacted stone pile filling and other foundation reinforcement and anti-seepage treatment methods,the problems of mud leakage and wall protection stability as well as the technical problems in the construction of ultra-conventional vibro-crushed stone pile have been effectively solved,realizing the quality analysis of ultra-deep anti-seepage wall and the quantitative evaluation of the seepage joint of the cut-off wall,reducing the occurrence of hidden dangers of anti-seepage body and effectively controlling the differential settlement risk,and promoting the construction progress and quality of the project,which can be used as reference for similar projects.