微型桩复合地基承载力设计理论与工程应用分析

摘要

This thesis draws on the engineering practice of jacked micro-pile composite foundation and analyzes the soil-pile interaction mechanism and bearing capacity participation coefficient. The bearing capacity calculation model of composite foundation substratum is validated. Results show that there is strong interaction between pile. In the process of composite foundation bearing capacity checking computations,the stress diffusing model is employed,and stress diffusion angle is recommendedφ′.%基于静压混凝土微型桩复合地基的现场试验与工程应用案例，研究微型桩复合地基的桩土相互作用及其承载力发挥系数，分析了复合地基下卧层承载力验算模型，通过计算验证了其工程实用性。结果表明：静压桩复合地基桩土相互作用明显，微型桩复合地基桩土承载力发挥系数较高；复合地基下卧层承载力验算时，可以采用增强体中性点平面位置扩散模型，其应力扩散角可取准′。