基于离散单元法研究沉管复合地基水平工作特性  

Discrete simulation on horizontal character of composite foundation under immersed tube by DEM

作　　者：朱小军[1,2] 李文帅[1] 费康[1] 许朝阳[1] 孔伟阳 

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225127 [2]东南大学土木工程学院,江苏南京210096

出　　处：《冰川冻土》2016年第4期1036-1043,共8页Journal of Glaciology and Geocryology

基　　金：江苏省高校自然科学基金项目(15KJB580013);国家自然科学基金项目(51278446)资助

摘　　要：通过颗粒流模拟,建立了沉管复合地基水平受荷时的离散元模型,对桩在水平荷载作用下的受力性状进行了研究.分析了土体位移场变化规律和应力变化等宏观因素,以及土颗粒力链、配位数和孔隙率等细观参数.由模拟结果可知:竖向荷载作用下沉管在水平方向移动时,垫层颗粒受到扰动,当增加竖向荷载,沉管底部土体受扰动范围变小,可知增加竖向荷载使桩间土的挤密作更显著,对降低土体扰动有较明显的效果;通过对桩顶土颗粒中强力链在沉管水平位移影响下的发展趋势研究知道,土体颗粒体系内力链并不是不变的,强弱力链之间可以相互转换.By particle flowcode simulation,the discrete element model of immersed tube under lateral load is established to study the pile＇s mechanical properties under horizontal loads. The soil displacement field and the stress variation under horizontal load are analyzed,and the macroeconomic factors such as soil particles force chain,coordination number,porosity and angle. From the simulation results that： the immersed tube moves in the horizontal direction under vertical load,particles cushion is disturbed,while increasing vertical load,the range of soil disturbance under immersed tube diminishes. The effect of soil compaction between pile and the range of soil disturbance reduction is more obvious when increase vertical load on immersed tube. According to the research of the strong chain in the pile top soil development lawunder the immersed tube horizontal movement,the soil particale force chain is variable,the strength force chain and the poor force chain can convert to each other.

关 键 词：水平荷载 颗粒流 工作性状 

分 类 号：TU43[建筑科学—岩土工程]