多孔透水混凝土桩复合地基承载特性研究

Study on Bearing Characteristic of Porous Pervious Concrete Pile Composite Foundation

多孔透水混凝土桩复合地基是处理高速公路桥头软弱地基的一种新技术。为研究其承载特性,进行了现场试验,获得了不同荷载时复合地基承载力、桩土荷载分担比、桩土应力比以及承载力发挥的实测数据,并进行了FLAC3D数值模拟。结果表明,复合地基桩土荷载分担比、桩土应力比随着荷载增加而趋于稳定值;桩承载力发挥比例随着荷载增加增长较快,最终超过土的发挥比例;复合地基承载力得到显著提高。

The porous pervious concrete pile composite foundation is a new technology to deal with soft ground of freeway bridgehead. In order to study the load bearing characteristics, some tests of the composite foundation are carried out, and the bearing capacity of the composite foundation, pile-soil load sharing ratio, pile-soil stress ratio and the development of bearing capacity under different loads are measured. FLAC3D numerical calculation is done as well. The result indicates that as the loads increase, pile-soil stress ratio and pile-soil load sharing ratio increase and tend towards stable values; as the loads increase, the development ratio of pite bearing capacity increases more rapidly and exceeds that of soil; the bearing capacity of porous concrete pile composite foundation improves remarkably.