载荷试验计算两层土复合地基变形模量

Calculation of Deformation Modulus of Two Layers Composite Ground Based on Loading Test

两栋18层住宅楼建在天然地基中有淤泥的土层上,地基采用振冲法处理。通过对两栋楼地基的载荷试验与沉降观测曲线的比对,发现对筏板基础依据载荷试验曲线初段的压缩模量不能真实反映复合地基的压缩性,建筑物的总沉降量与载荷试验曲线的后半段相关。根据载荷试验曲线计算压板影响范围内两层复合地基土变形模量,据此参数计算建筑物的沉降量与根据实际沉降观测结果推算值较为接近,克服了现有的根据载荷试验只能获得一层土变形模量的缺陷。

Two dwelling buildings with 18 stores are proposed on a ground consisting of ,soft marine clay. The foundation is treated with vibroflotation. Based on the comparison of the load tests and the settlement curves, it is founded that the modulus on initial linear part of the curve of load tests does not truly express the compression of the composite ground for the raft-foundation and that the settlement is related with later linear part of the curve of load tests This article is about the calculation method of the deformation modulus of two layers composite ground within the plate influence from the data of load-test. It is close that the calculation settlement with the modulus compared with the calculation settlement with the measured settlement of the two buildings. The two layers modulus from load-test is avoid of the defect of the using method which only one layer modulus of deformation is gained.