疏排桩支护结构中土拱荷载传递比分析  

Analysis of load transfer ratio of soil arching in sparse row piles

作　　者：苏迎社[1] 杨媛媛[2] 

机构地区：[1]长安大学工程设计研究院,西安710064 [2]长安大学建筑学院,西安710061

出　　处：《吉林大学学报（工学版）》2015年第2期400-405,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：陕西省社会发展攻关计划项目(2014K15-01-01)

摘　　要：在以往关于土拱效应研究的基础上,提出了土拱荷载传递比的概念,并建立了分析计算模型。通过土工离心机模型试验验证了Ito提出的排桩桩侧土压力的计算方法在深基坑疏排桩支护结构中的适用性,并基于该方法,结合一个疏排桩支护工程事例对土拱荷载传递比的影响因素作了比较全面的分析。研究结果表明:疏排桩支护结构中,桩间土拱效应不容忽视,通过土拱传递到排桩上的土压力最大可占到排桩承受的总土压力的60%以上;土拱荷载传递比随着桩间净距的增大近似呈指数形式减小,当桩间距相同时,桩径越大,土拱荷载传递比越小;当其他参数不变时,土拱荷载传递比随土体内摩擦角和土体黏聚力的增加近似呈指数形式增加。Base on previous research on soil arching effect between adjacent piles,the concept of load transfer ratio of soil arching was proposed,and an analysis model was established.Through centrifuge model test,the Ito’s calculation method of lateral pressure on pile was proved to be applicable to deep foundation supported with sparse row piles.Based on this approach,the influence factor of the load transfer ratio of soil arching was comprehensively analyzed with an assumed case of sparse row piles.Results show that the earth pressure passing to the pile by soil arching can account for over 60% of the total pressure on the pile.Therefore,soil arching effect between adjacent piles in sparse row pile retaining structure can not be ignored.The load transfer ratio of soil arching approximately exponentially decreases with the increase in pile space.When the pile space is constant the load transfer ratio decreases with the increase in pile diameter.In addition,if parameters are unchanged,the load transfer ratio exponentially increases with the cohesion and internal friction angle of the soil.

关 键 词：疏排桩 土拱效应 土拱荷载传递比 离心机模型试验 

分 类 号：TU431[建筑科学—岩土工程]