预应力管桩在二明窦排涝泵站地基处理中的应用

Application of Prestressed Pipe Pile in Foundation Treatment of Ermingdou Drainage Pumping Station

为提高二明窦泵站地基土承载力,采用预应力管桩基础进行处理。根据现场载荷试验结果可知,处理后桩土承载力可提高至220kPa,满足设计要求。结合地勘情况,建立数值模拟模型,得出桩土应力比与桩土沉降差随着泵站的施工进程逐渐增大,在泵站施工完成时达到最大。之后由于上部荷载稳定,桩间土固结承载力提升,桩土应力比以及桩土沉降差逐渐减小。

In order to improve the bearing capacity of the foundation soil of the Ermingdou Pumping Station,prestressed pipe pile foundations are used for treatment.According to the field load test results,the pile-soil bearing capacity can be increased to 220kPa after treatment,which meets the design requirements.Establish a numerical simulation model based on the geological prospecting situation.It is concluded that the pile-soil stress ratio and the pile-soil settlement difference gradually increase with the construction process of the pumping station,and reach the maximum when the construction of the pumping station is completed.Due to the stability of the upper load,the consolidation bearing capacity of the soil between the piles increases,and the pile-soil stress ratio and the pile-soil settlement difference are gradually reduced.