微型抗滑桩土拱效应空间特征的细观力学分析  

Mesomechanical analysis of spatial characteristics of soil arching effect on micro anti-slide pile system

作　　者：姜春林[1] 李晋[1] 

机构地区：[1]山东交通学院土木工程学院,济南250037

出　　处：《岩土力学》2012年第6期1754-1760,1815,共8页Rock and Soil Mechanics

基　　金：国家自然科学基金资助(No.51108255);山东省自然科学基金(No.ZR2009FQ015);山东省交通运输厅科技项目(No.2010Y25-1)

摘　　要：目前研究中大多将土拱效应简化为平面应变问题,而微型抗滑桩由于桩径小,在承担滑坡推力时将发生较大的变形,其土拱效应的产生和发展具有明显的三维空间特征,目前的研究方法难以考虑这一问题。为此采用基于离散单元法的颗粒元程序PFC3D,利用平行黏结模型建立微型抗滑桩进行分析。模拟结果显示,微型抗滑桩系统中土拱主要出现在接近滑面的深部和中部土体中,浅部土体中土拱受到桩身位移的影响无法成型,且桩间以水平土拱为主,桩长和桩身刚度对微型抗滑桩系统的土拱分布影响不大;随着桩间距的增加,土拱的形成受到显著影响。The soil arching effect in micro anti-slide pile system has obviously spatial characteristics when bearing landslide thrusts because of pile body large deformation due to its small diameter.Most current research methods could not consider this point,just treat soil arching effect as plane strain problem.Therefore,based on the particle flow code in 3-dimensions（PFC3D）,a series of micro anti-slide pile system tests are simulated to study the formation and development process of the soil arching.The simulation results show that the soil arching effect mainly occurs in the middle and bottom of soil body located nearby the slip plane.The soil arching effect located in the top of soil body is affected by the pile displacement which causes the evident horizontal soil arching formed between piles.Pile length and stiffness have little influence on the distribution of soil arching.It is difficult to form soil arching with the increasing of pile spacing.

关 键 词：滑坡 微型抗滑桩 土拱效应 颗粒元 细观力学 

分 类 号：TU473[建筑科学—结构工程]