静压闭口变截面管桩承载性状模型试验研究

Model Test Study on Bearing Behavior of Hydrostatic Closed Variable Cross-Section Pipe-Pile

为了对比研究静压闭口阶梯型变截面与等截面管桩的荷载与沉降量的关系,在室内基坑中分别对3根变截面管桩和2根等截面管桩进行单桩静载试验。试验结果表明:当桩身体积相同时,变截面管桩较等截面管桩在提高竖向极限承载力和减小桩顶沉降量方面具有明显的优势。通过对荷载-沉降曲线进行回归分析,结果发现,可用指数函数描述荷载与沉降量的关系。根据拟合函数得到的计算值与实测值基本一致,说明用指数函数描述荷载与沉降量的关系是可行的。

In order to study comparatively the relationship between the load and settlement of the hydrostatic closed ladder-type variable cross-section pipe-pile and the constant section pipe-pile, three variable cross-section pipe-piles and two constant section pipe-piles were implemented pile static-load tests in foundation pit. The results showed that when the piles＇ body volume is the same, the variable cross-section pipe-piles had obvious advantages in increasing vertical ultimate bearing capacity and decreasing the pile settlement. Through the load - settlement curve regression analysis, found that the exponential function could be used to describe the relationship between the load and settlement, and according to the fitting function, found that the calculated values and the measured values are basically the same, and indicated that it was feasible to describe the relationship between load and settlement by exponential function.