路堤荷载下刚-柔性桩复合地基应力特性研究

Characteristic study on composite foundation with rigid-flexible piles under the load from embankment

介绍了温州瓯海大道桥头路堤采用低强度砼桩和水泥搅拌桩组合复合地基处理桥头跳车问题。通过在路堤下埋设钢弦式压力盒,获得了路堤下低强度砼桩、水泥搅拌桩以及土的应力比数值随时间的变化规律,并分析了三者荷载分担比随时间的变化特性。现场测试结果还表明,路堤荷载下桩土应力比要比刚性承压板下小得多,其研究成果可为路堤下刚-柔性桩复合地基设计提供有益参考。

This paper introduces a successful application of the composite foundation with low-strength-concrete pile and cementmixed pile in Ouhai mad of Wenzhou to alleviate bridge-head jump. Through pressure metre under embankment, the magnitude of pile-soil stress ratio and its variation with the time are measured, and the variation of pile-soil load share ratio with time is analyzed. Furthermore, the measured results in site show that the measured pile-soil stress ratio under flexible foundation is much less than that under rigid foundation. The conclusion can provide valuable preference for the design of the composite ground under embankment.