混凝土芯砂桩加固路基的沉降特性数值分析  

Numerical Analysis of Settlement Characteristics of Concrete-core Sand-gravel Piles

作　　者：管中林 齐虎 陈荣平 钟志强 陈盛原 赵维炳[1] GUAN Zhonglin;QI Hu;CHEN Rongping;ZHONG Zhiqiang;CHEN Shengyuan;ZHAO Weibing(Nanjing Hydraulic Research Institute,Nanjing,Jiangsu 210029,China;China Railway No.5 Engineering Group Co.,Ltd.,Guiyang,Guizhou 550000,China)

机构地区：[1]南京水利科学研究院,江苏南京210029 [2]中铁五局集团有限公司,贵州贵阳550000

出　　处：《水利与建筑工程学报》2023年第3期203-208,共6页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金项目(51208321);南京水利科学研究院创新团队基金项目(Y321008)。

摘　　要：混凝土芯砂石桩(砼芯砂桩)是由混凝土芯桩和芯桩外部的砂石壳组成的复合桩,其芯桩能提高竖向承载力,而外部砂石壳作为竖向排水通道能加快桩间土孔隙水的排出,有效控制地基的工后沉降。对砼芯砂桩桩承式路堤进行了现场试验及有限元分析,现场主要进行了地基沉降和孔压的监测,将观测数据与有限元分析结果进行了对比研究,在此基础上进行桩体参数分析,以研究桩长、桩间距、砂桩直径对砼芯砂桩复合地基沉降特性的影响。结果表明:砼芯砂桩复合地基的沉降和超静孔隙水压力消散迅速主要是由于砂桩提供的快速排水通道;桩长、桩间距和砂墙宽度均对砼芯砂桩的沉降有一定影响,其中桩间距影响最大。Concrete core sand pile is a composite pile composed of concrete core pile and sand shell outside the core pile which can improve the vertical bearing capacity,while the external sand shell,as a vertical drainage channel,can accelerate the discharge of soil pore water between the piles and effectively control the post-construction settlement of the foundation.The field test and finite element analysis are carried out on the concrete core sand pile pile-borne embankment,and the monitoring of foundation settlement and pore pressure is mainly carried out on the site.The observation data and the finite element analysis results are compared.The pile parameters were adopted to analyze the influence of pile length,pile spacing and sand pile diameter on the settlement characteristics of concrete core sand pile composite foundation.The results show that the rapid settlement and excess pore water pressure dissipation of concrete core sand pile composite foundation are mainly due to the fast drainage channel provided by sand pile.Pile length,pile spacing and sand wall width all have certain influence on the settlement of concrete core sand pile,among which pile spacing has the greatest influence.

关 键 词：地基处理 数值模拟 混凝土芯砂石桩 沉降 

分 类 号：TU472[建筑科学—结构工程]