桩网复合地基桩土应力比的确定

实践证明,桩网复合地基同时具备竖向增强体复合地基与水平向增强体复合地基的加固优点,能很好地提高地基土体承载力,减小不均匀沉降,特别是桥头过渡段地基处理中能有效控制“桥头跳车”现象的产生。本文主要对桩网复合地基的加固机理进行分析,并结合自然平衡拱理论和加筋垫层拉膜效应理论推导出路堤下桩网复合地基桩土应力比计算公式,同时分析了各设计参数变化对桩土应力比的变化规律。工程实体试验表明,本文所推导的桩土应力比计算公式具有较好的适用性。

Determination of the stress ratio of pile and soil of pile-net composite foundation

Pile-net composite foundation has some merit in building up the reinforcement of composite foundation simultaneous in vertical and horizontal directions,in enhancing the bearing capacity of foundation soil,and minishing the non-uniform settlement,especially controlling the phenomenon of vehicle dumpping on bridge head in the foundation treatment of transitional segment,which is proved by practice.This article analyses the reinforcement mechanism of pile-net composite foundation mainly,combining natural equilibrium arch theory and reinforced cushion tension membrane theory to deduce the calculation formula of the stress ratio of pile-soil in the pile-net composite foundation under embankment.It is indicated by the project that the calculation formula of the stress ratio of pile-soil in this article is applicable.