加筋材料对桩-网复合地基沉降特性的影响  

Influence of reinforced materials on settlement characteristics of pile-net composite foundation

作　　者：朱琳 占宏 刘继状 ZHU Lin;ZHAN Hong;LIU Jizhuang(Department of Engineering Cost,Zhejiang College of Construction,Hangzhou 311231,China;Engineering Design Group Co.,Ltd.,Zhejiang University of Technology,Hangzhou 310014,China)

机构地区：[1]浙江建设职业技术学院工程造价学院,浙江杭州311231 [2]浙江工业大学工程设计集团有限公司,浙江杭州310014

出　　处：《浙江工业大学学报》2021年第6期656-663,共8页Journal of Zhejiang University of Technology

基　　金：浙江省教育厅基金资助项目(Y201942883)。

摘　　要：为分析不同类型的加筋材料对桩-网复合地基加固处理后沉降特性的影响,根据某市城际铁路工程地基处理情况进行了7组室内模型试验,对比不同加筋材料、桩基布置形式和桩帽连接方式对软土地基沉降、桩土差异沉降和桩土应力比的影响。研究结果表明:采用桩-网复合地基可有效减小深厚软土的地基沉降和桩土差异沉降;三向土工格栅控制沉降的效果优于双向土工格栅和单向土工格栅;正三角形桩基布置形式比正方形布置形式更有利于达到控制沉降的效果;桩顶桩帽设置增大了桩体与上部垫层的接触面积,减小地基的整体沉降和桩土差异沉降;采用有限元分析了桩-网复合地基的长期沉降变形,结果表明沉降在早期快速增长后趋于稳定。In order to analyze the influence of different types of reinforcement materials on the settlement characteristics of the pile-net composite foundation,seven groups of model tests,according to the foundation treatment of the inter-city railway project,were conducted to evaluate the effects of reinforcement materials,pile arrangement and pile cap connection methods on the settlement of the soft soil foundation,the settlement difference between piles and soil and the stress ratio between piles and soil.The research results show that the use of pile-net composite foundation can effectively reduce the settlement of the foundation and the settlement difference between piles and soil in deep soft soil.The three-way geogrid is more efficient to control settlement than two-way or one-way one.The pile foundation with equilateral triangular arrangement is more conducive to settlement control than that with square arrangement.The pile cap at the top of piles increases the contact area between piles and upper soil cushion,reducing the settlement of the foundation and the settlement difference between piles and soil.Finally,the long-term settlement deformation of the pile-net composite foundation was analyzed by the finite element method.The results show that the settlement tends to stabilize after rapid growth in the early stage.

关 键 词：桩-网复合地基 加筋材料 模型试验 沉降 

分 类 号：TU411.93[建筑科学—岩土工程]