碎石桩内部的拱效应分析

基于颗粒介质堆中应力传递的试验研究，模拟碎石材料桩的压缩变形过程，分析了在轴向静力荷载作用下，碎石桩内部材料中的应力分布、位移形式、颗料介质微观变化对宏观力学响应的影响、桩周土对桩体材料的作用及桩体材料拱效应的影响范围，进而研究抑制拱效应、提高桩体承载力的问题．研究结果表明，利用微结构可以解释散体介质的许多特性，解释散体材料桩破坏的内在机理．

Analysis of arch effect in gravel pile

On the basis of experiment on force transfer in a disorder granular medium,the compressional distortion of pile material is simulated,the problems such as stress distribution,displacement manner in the pile material,influence of microscopic change of the particle medium on microscopic mechanical response,action of the soil around the pile on the pile material,and the area of influence of pile soil on the arch effect in pile material are analyzed when pile is subjected to an axial static load.Further,the problems of restraint of arch effect and improvement of pile bearing capacity is investigated.Research result shows that the properties of granular medium can be well explained using micro-structure,and the interned mechanism for the change of pile can be understood.