基于离散元颗粒接触模型的桩网复合地基土体力学改良影响研究  

Study on the influence of soil mechanical improvement on pile-mesh composite foundation based on discrete element particle contact model

作　　者：管鸣睿 GUAN Ming-rui(Tianjin Survey and Design Institute Group Limited,Tianjin 300000)

机构地区：[1]天津市勘察设计院集团有限公司,天津300000

出　　处：《地下水》2023年第3期143-146,共4页Ground water

摘　　要：为探讨保定环城水系东南段泵闸工程封装桩复合地基土体力学改良影响,采用离散元颗粒线性接触模型进行模拟计算,分析了复合土体三轴力学影响特征。研究表明,土工织物厚度对复合土体承载应力促进作用具有上限,当厚度超过0.08 mm后承载应力的提升较小,土工织物的存在,会改变复合土体应变弹-延塑性主导特征。封装料空隙率愈大,复合土体承载能力愈弱,且围压愈大,不仅可提升复合土体承载应力,也可减弱封装料空隙率对复合土体的抑制效应。高空隙率封装料试样在残余应力段具有较长时段的低应力、高应变。抗剪特征参数受土工织物厚度因素影响较小,主要受封装料空隙率影响较大。论文成果可为探讨离散元颗粒线性接触模型的应用及土体力学特征研究提供参考。In order to explore the effect of encapsulated pile composite foundation soil mechanics improvement in the southeast section of Baoding Ring Water System Pump and Gate Project,a discrete element particle linear contact model was used for simulation calculations and the triaxial mechanical influence characteristics of the composite soil were analysed.Research shows that the geotextile thickness has an upper limit to the composite soil bearing stress promotion,when the thickness exceeds 0.08 mm the lifting of the bearing stress is smaller,the existence of geotextiles will change the composite soil strain elasticity-ductile plasticity dominant characteristics.The greater the encapsulated material void ratio,the weaker the composite soil bearing capacity and the greater the perimeter pressure,which not only enhances the composite soil bearing stress,but also weakens the inhibition effect of the encapsulated material void ratio on the composite soil.High void fraction encapsulated material specimens have long periods of low stress and high strain in the residual stress section.The shear characteristic parameter is less influenced by the geotextile thickness factor and more influenced by the encapsulated material void ratio.The results of the thesis can provide a reference for exploring the application of discrete element particle linear contact models and the study of the mechanical characteristics of soil bodies.

关 键 词：离散元 颗粒接触模型 保定环城水系 力学 

分 类 号：TU472[建筑科学—结构工程]