小直径钻孔灌注桩复合地基施工

泉厦扩建高速公路A7合同段K446＋000-K450＋873段、K450＋873-K459＋000段属于软基处理段，本段软基属于剥蚀丘陵间海积平原地貌及其与坡地交接地段。根据岩土工程勘察报告，第四系地层主要有海陆交互沉积层、残积层，局部地表见零星分布的人工填土，地下水位埋深一般小于2m，采用小直径（50cm）钻孔混凝土灌注桩复合地基进行处理，取得了良好的效果。

Compound Ground Construction of Minor Diameter Drill Hole Filling Pile

The A7 contract section K446＋000, K450＋873 section and K450＋873, K459＋000 section belong to soft foundation treatment section. It is junction section of erosion hills of long-term bulge marine plain landform and sloping fields. The ground project reconnaissance shows that the fourth heterotaxy stratum has the holocene changle group flood and field alternately deposit formation, the eluvium, little artificial earth filled the partial surface. This heterotaxy＇s subsoil water level is smaller than 2m generally. It has well effect if we carry on processing with the compound ground of the minor diameter （50cm） drill pile.