对于某五层住宅楼软弱地基采用粉喷桩处理后,铺设一定厚度的砂垫层形成粉喷桩复合地基,之后随机分别抽取三根单桩和桩的复合地基进行静载荷试验,分析单桩和复合地基的受力特性与沉降之间的关系,并在载荷板下的桩中心、桩边缘内外两侧及桩土中各放置压力盒,根据作用在桩-土的应力测试结果,分析整个加荷过程中该类复合地基的桩土应力比的变化规律。 For a five-storey residential building, the soft foundation is treated with DJM pile, and a certain thickness of sand cushion is laid to form DJM composite foundation. After that, three composite foundation with single pile and pile are randomly selected for static load test. The relationship between the stress characteristics of composite foundation and settlement, and put the pressure box under the load plate under the center of the pile, both inside and outside the pile edge and pile soil, according to the stress test results of pile - soil interaction, analyze the whole plus The Law of Pile - soil Stress Ratio of Composite Foundation in the Course of Load.