砂土中单桩承载特性室内试验分析  

Study on the Bearing Characteristics of Single Pile Foundation in Sands by Indoor Model Tests

作　　者：邹圣锋[1,2] 张贵川[1] 韩毅[1] 汪时机[1] 汪川[1] 

机构地区：[1]西南大学工程技术学院建筑系,重庆400716 [2]浙江大学滨海和城市岩土工程研究中心,杭州310058

出　　处：《西南师范大学学报（自然科学版）》2015年第10期160-166,共7页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：国家大学生创新创业训练计划(201310635050);国家自然科学基金项目(11572262);中央高校基本科研业务费专项资金项目(XDJK2016B006)

摘　　要：针对不同砂性地质条件和工况,通过室内模型试验,研究了砂土中桩基的承载力性状.研究表明:砂土在自重条件下发生自密实,并将影响到室内模型基桩的承载性能,承载力随砂土密度的增大有增长的趋势;试验孔道位置和贯入深度的改变诱发极限承载力值发生改变,模型桩承载曲线表现出明显的边界效应和深度效应;贯桩速度的增大也引起模型桩极限承载值的相应增加.模型试验结果可以定性分析砂土中桩基的承载特性,为桩基设计提供指导.According to the geological and sandy variations,a series of indoor model tests have been conducted to study pile bearing characteristics in sands.The results showed that the consolidation process of sands was completed due to self weight which would influence the bearing behaviours of the model piles.The bearing capacity of model piles shows an increasing trend as the sands developed to be denser.Moreover,changes of boring location and penetration depth would lead to pile failure at different bearing values.The effects of borehole location and depth became clearly during the tests,which could be found from the bearing curve.Additionally,it was showed the ultimate bearing capacity of pile increased to some extent while penetrating went faster.The model tests reveals the pile bearing characteristics under certain conditions qualitatively,which could guide the application in pile design projects.

关 键 词：室内试验 模型桩基 CPT 承载力 

分 类 号：TU411[建筑科学—岩土工程]