加筋宽度与间距对膨胀土特性影响研究  

Study on the influence of reinforcement width and spacing on characteristics of expansive soil

作　　者：许英姿[1,2] 廖旭航 苏超 颜日葵 XU Yingzi;LIAO Xuhang;SU Chao;YAN Rikui(School of Civil Engineering,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Mitigation and Engineering Safety of Guangxi,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西防灾减灾与工程安全重点实验室,广西南宁530004

出　　处：《铁道科学与工程学报》2021年第10期2583-2590,共8页Journal of Railway Science and Engineering

基　　金：广西安科岩土工程有限责任公司合作科研项目(YT05-2017-DW002)。

摘　　要：为研究挡土墙背后加筋宽度与间距对膨胀土特性的影响,以广西南宁三塘地区膨胀土为填料,铺设土工格栅形成膨胀加筋土,制作挡土墙模型,进行不同加筋宽度与间距的模型试验,研究侧向压力与膨胀变形在不同加筋宽度和间距下的变化规律。试验结果表明:纯膨胀土的渗透性很小,加筋后,土工格栅有导水作用,增加了排水通道,能在短时间排出水分,停止注水后土的体积含水率骤降,侧向压力大幅度减小;膨胀土吸水膨胀后,土工格栅与膨胀土之间存在界面摩擦力,导致土工格栅被拉紧,应变增加,同时限制膨胀土的膨胀;随着加筋密度与宽度的增加,膨胀土的膨胀变形与侧向压力减小,减小加筋间距提升的限制效果比增加加筋宽度更加明显。In order to study the influence of the width and spacing of reinforcement behind the retaining wall on the characteristics of expansive soil,the expansive soil in Santang of Nanning City,Guangxi Province,was used as the filling material.The model of the retaining wall was made by laying the geogrid.The model test of different reinforcement width and spacing was carried out to study the evolution of lateral pressure and expansion deformation.The results show that:the permeability of pure expansive soil is very small.After reinforcement,the geogrid has the function of conducting water and increasing the drainage channels,which can discharge water in a short time.After stopping the water injection,the volume water content of the soil drops sharply,the lateral pressure greatly decreases;after the expansive soil expands,there is interface friction between the geogrid and the expansive soil,which leads to the geogrid to be tightened and strain increases,and limits the expansion of the expansion soil.With the increase of reinforcement density and width,the expansion deformation and lateral pressure of expansive soil decrease,and the restriction effect of increasing reinforcement spacing is more obvious than that of increasing reinforcement width.

关 键 词：膨胀土特性 土工格栅 侧向膨胀力 模型试验 

分 类 号：TU443[建筑科学—岩土工程]