水泥土搅拌桩复合地基承载力的双曲线确定法

Disscussion on the curve fitting method for load test of cement-soil mixed pile composite foundation with hyperbola

按相对变形法确定水泥土搅拌桩复合地基载荷试验承载力基本值时 ,相对变形值为某一范围。从工程实践来看 ,按其上、下限确定的承载力相差甚大 ,且在运用时又无成熟的经验和标准 ,不同的测试单位取值标准不同 ,导致测试结论不同。文章在分析大量水泥土搅拌桩复合地基载荷试验资料基础上 ,说明水泥土搅拌桩复合地基载荷试验的P—s曲线近似为一条双曲线 ,通过对双曲线的特征分析 ,得出一种简单实用的确定水泥土搅拌桩复合地基承载力的方法。

The determination of the bearing capacity of a composite foundation with the load test results depends on the relative settlement in a range. From engineerng practics, the difference of bearing capacity determined by two limits is very large and there is not both matural experience and criterion. Different ralative settlements lead to different conclusions. On the basis of load test results of the composit foundation, P-s curve of cement-soil-mixed composite foundation test can be approximately considered as hyperbola, from which a method of determining the load bearing capacity can be concluded.