SDDC桩在宁夏南部湿陷性黄土地基处理中的应用

Application of SDDC Pile in Collapsible Loess Foundation Treatment in Southern Ningxia

宁夏水利水电工程局有限公司承建的清水河流域城乡供水工程(水工部分)二标段6#调蓄水池工程位于湿陷性黄土区域,湿陷性黄土遇水沉降导致工程建筑物受损,所以地基的处理是重中之重,经过技术经济方案的对比,SDDC桩与混凝土灌注桩相比,可节约成本386.83万元,且试验结果表明,SDDC桩处理后的地基土的平均湿陷系数小于0.015<设计值0.04,地基土的湿陷性全部消除,达到要求,最终选择孔内深层强夯法(SDDC)进行处理。

The Qingshuihe River Basin Urban and Rural Water Supply Project(Hydraulic Part)Lot II 6#Water Storage Tank Project undertaken by Ningxia Water Resources and Hydropower Engineering Bureau Co.,Ltd.is located in the collapsible loess area,and the collapsible loess subsides when encountering water,causing damage to the engineering buildings,so the foundation treatment is the top priority.Through the comparison of technical and economic schemes,SDDC piles can save 3868300 yuan compared with concrete cast-in-place piles,and the test results show that:after SDDC pile treatment,the average collapsibility coefficient of the foundation soil is less than 0.015<the design value 0.04,and the collapsibility of the foundation soil is completely eliminated to meet the requirements.Finally,the deep dynamic compaction method(SDDC)in the hole is selected for treatment.