CFG桩复合地基承载性状试验研究  

Experimental research on load-bearing property of CFG pile composite foundation

作　　者：郅彬[1] 李戈[1] 王永鑫[1] 郭洁[1] 王番[1] 

机构地区：[1]西安科技大学建筑与土木工程学院,西安710054

出　　处：《建筑结构》2017年第23期100-102,71,共4页Building Structure

基　　金：国家自然科学基金项目(41172262)

摘　　要：基于西安黄土地区某工程,通过埋设土压力盒,完成了竖向增强体、单桩复合地基静载荷试验,经数据分析,对CFG桩复合地基的承载性状及桩土的受力情况进行了探讨。结果表明:桩土应力比随荷载增大,最终趋于稳定;当荷载达到一定水平后,复合地基承载性状和单桩趋于一致,桩间土承载力发挥不足。并根据桩土共同作用机理,在高应力水平下,可考虑单桩作用机理或桩间土承载力发挥系数β相应取小值来计算复合地基承载力,为相关工程提供参考。Based on a project in the loess area of Xi＇ an,the static load test of vertical reinforcement and single pile composite foundation was completed by embedding earth pressure box.Based on the data analysis,the bearing capacity of CFG pile composite foundation and the stress condition of pile and soil were discussed.The results show that the pile-soil stress ratio increases with increase of load and eventually tends to be stable.When the load reaches a certain level,the bearing behavior of the composite foundation is consistent with the single pile,and the bearing capacity of the soil between the piles is not enough.According to the interaction mechanism of pile and soil,under high stress level,the bearing capacity of composite foundation can be calculated by considering action mechanism of single pile or the developing coefficient β taken as the smaller value of bearing capacity of soil between piles,which can provide reference for the related engineering.

关 键 词：CFG桩复合地基 承载性状 静载荷试验 桩土应力比 桩间土承载力发挥系数 

分 类 号：TU473.1[建筑科学—结构工程]