基于PFC^2D的抗滑桩土拱效应研究  

Soil Arching Effect of Anti-slide Piles Based on PFC^2D

作　　者：鲁杰[1] 向先超[2] 

机构地区：[1]河南省地质矿产勘查开发局第四地质勘查院,河南郑州450001 [2]中国地质大学工程学院,湖北武汉430074

出　　处：《资源导刊（地球科技版）》2015年第5期29-32,共4页

基　　金：国家自然科学基金（41372311）,中央高校基本科研业务费专项资金资助项目（CUG110810）,中央高校基本科研业务费特色团队项目（CUG120112）.

摘　　要：抗滑桩土拱效应的研究目前主要建立在连续介质理论的基础上，与土体自身非连续、非均匀散粒体的固有属性不符，因此有必要进一步深入探讨其成拱机理。采用颗粒流方法，揭示了土拱效应的形成、发展和破坏过程，在此基础上，研究了土拱作用下抗滑桩桩径比、桩土相对变形速度和土体颗粒粒度组成对桩土荷载分担比的影响规律。结果表明：以上因素对抗滑桩土拱效应影响显著。土拱的承载能力随着桩径比的增大而减小，随桩土间的相对运动速度和土颗粒的分布宽度增大而增大，因此在抗滑桩设计及布桩位置选择时，应尽可能考虑相关影响因素，以优化设计，节省投资。The studies on soil arching effect of anti-slide piles are mainly based on the continuous medium theory at present. It is difficult to consider the distribution of soil particle size and other important factors. It is necessary to further reveal the arching mechanism of soil which is non-continuous and non-uniform material. PFC^2D is used to study the effects of anti-slide pile size, spacing, pile-soil relative deformation rate and soil particle size distribution on the format ion, development, destruction of the soil arch. The effects of the above factors on the maximum bearing capacity, residual bearing capacity of the soil arch and the pile-soil load share ratio are revealed. The results show that the effects of these factors are significant. The maximum bearing capacity of the soil arch decreases as the increase of the ratio of the pile spacing to the width, and increases as the increase of pile-soil relative deformation velocity and soil particle distribution width. Therefore, related factors should be considered as far as possible in anti-slide pile design and cloth pile location selection, to optimize the design and save investment.

关 键 词：抗滑桩 土拱效应 PFC^2D 荷载分担比 

分 类 号：TU473.13[建筑科学—结构工程]