桩间土拱空间演变机理与构造柱支护应用研究  

Research on Spatial Evolution Mechanism of Soil Arch Between Piles and Application of Structural Column Support

作　　者：黄俊文 刘笑含 廖飞 夏力农[2] HUANG Junwen;LIU Xiaohan;LIAO Fei;XIA Linong(The Third Company Of China Fifth Engineering Bureau Ltd.,Changsha,Hunan 410004,China;Department of Civil Engineering,Changsha University,Changsha,Hunan 410003,China)

机构地区：[1]中建五局第三建设有限公司,湖南长沙410004 [2]长沙学院土木系,湖南长沙410003

出　　处：《建筑施工》2021年第5期945-949,共5页Building Construction

基　　金：国家自然科学基金项目(51378083);长沙市科技计划重点课题(K110706-11)。

摘　　要：运用数值模拟方法对支护桩桩间土拱效应机理进了研究,结果表明:土拱效应存在“成拱—稳定—失效—再成拱”的演变过程。其中第一阶段土拱支撑依赖于桩-土相互作用,第二阶段土拱主要靠连拱效应稳定。桩间土土体参数和荷载作用对土拱演变过程有明显影响,土拱矢跨比及拱厚均随黏聚力或内摩擦角的增大而变小,随荷载的递增而增大。基于土拱空间演变机理,提出了桩间土构造柱应用技术,分析了最大主应力、水平应力及Mises分布规律,结果表明构造柱可以稳定拱前自由区的独立土柱,分担土拱的荷载,限制应力绕流现象,加强楔紧效应,改善土拱受荷工况。The mechanism of soil arching effect between supporting piles is studied by numerical simulation method.The results show that the soil arching effect has an evolution process of"arching—stability—failure—re-arching".Among them,the first stage soil arch support relies on the pile-soil interaction,and the second stage soil arch is mainly stabilized by the continuous arch effect.The soil parameters and loads between the piles have a significant impact on the evolution of soil arches.The rise-span ratio and arch thickness of soil arches both decrease with the increase of cohesion or internal friction angle,and increase with the increase of load.Based on the spatial evolution mechanism of the soil arch,the application technology of the soil structural column between the piles is proposed.The maximum principal stress,horizontal stress and the distribution of Mises are analyzed.The results show that the structural column can stabilize the independent soil column in the free zone before the arch,share the load of the soil arch,limit the phenomenon of stress circumfluence,strengthen the wedging effect,and improve the loading condition of the soil arch.

关 键 词：数值模拟 土拱效应 演变 矢跨比 桩间土构造柱 

分 类 号：TU753[建筑科学—建筑技术科学]