水平推力作用下抗滑桩间土拱效应影响因素的数值分析  

Numerical analysis of influence factors on soil arching effect between anti-sliding piles under horizontal pushing loads

作　　者：刘钦[1,2] 李地元[3] 刘志祥[3] 刘静[4] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]山东黄金集团三山岛金矿,山东莱州261442 [3]中南大学资源与安全工程学院,湖南长沙410083 [4]中南大学土木工程学院,湖南长沙410075

出　　处：《中南大学学报（自然科学版）》2011年第7期2071-2077,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金;上海宝钢集团公司联合资助项目(51074177)

摘　　要：利用FLAC3D软件对抗滑桩后土体的应力拱产生过程和形成机理进行三维数值分析,并通过一系列的对比计算,研究桩间距、土体性质(包括土体的内摩擦角、黏聚力、弹性模量、泊松比、膨胀角)以及桩土接触面性质等因素对土拱效应的影响。研究结果表明:随着抗滑桩桩间距的增大,土拱范围变小,土拱形状也由拱形发展到扁平抛物线形,桩的荷载分担比降低。土体内摩擦角、土体黏聚力以及桩土之间的相对弹性模量对土拱效应的影响呈正相关关系,而土体的泊松比对桩后土拱范围的影响呈反比关系,土体的膨胀角对土拱效应影响不太明显;随着桩土接触面粗糙程度的增加,桩后土拱的范围增大,土拱效应也越显著。Through 3D numerical analysis of the arching effect between anti-slide piles and soils by FLAC3D software,the process and the mechanism of stress arching effect in the soil were studied.By a series of calculations and comparisons,the influence factors on the soil arching effect were determined.For instance,the space of piles,the mechanical properties of soil（such as internal frictional angle,cohesion,elastic modulus,Poison＇s ratio and dilation angle of soil） and the interface properties between piles and soils were analyzed in detail.The results show that the soil arch zone will become small and the arch shape will change from arched to parabola with the increase of pile spaces.The internal friction angle,the cohesion and the relative elastic modulus between piles and soil play a positive role in soil arching effects,but the Poisson＇s ratio plays a negative role.The shear dilation angle has no conspicuous effect on the soil arching.Besides,the soil arch zone will enlarge with the increase of roughness of contact interface between piles and soils.

关 键 词：水平推力 土拱效应 抗滑桩 应力拱 桩土相互作用 

分 类 号：TU473[建筑科学—结构工程]