Research and Application of Key Technologies in the Construction of Composite Foundation with Deep Overburden of Bleached Sand and Gravel
Based on the Yingliangbao Hydropower Project,this paper summarizes the complex and varied geo-logical conditions of deep overburden and the formation with giant bleach sand.Through the precise construc-tion technology of cut-off wall and underground diaphragm wall;foam mud wall protection technology;auto-matic and accurate measurement of super-standard vibro-crushed stone pile packing;accurate layout construc-tion 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 imperme-able 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 vi-bro-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 oc-currence 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 pro-jects.
Yingliangbao Hydropower ProjectBleached sand gravelDeep overburdenComposite foundation treatmentUltra-deep cut-off wallUltra-conventional vibro-crushed stone pile
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