GCL用于路基水分场调控可行性及铺设位置优化分析  

Feasibility of Using GCL for Regulating Road Subgrade Moisture Field and Optimization of the Installation Position

作　　者：刘志彬[1,2] 王宇婷 罗婷倚 唐亚森 谢世平 LIU Zhibin;WANG Yuting;LUO Tingyi;TANG Yasen;XIE Shiping(School of Transportation,Southeast University,Nanjing 211189,Jiangsu,China;National Experimental Teaching Demonstration Center for Road and Traffic Engineering,Southeast University,Nanjing 211189,Jiangsu,China;Guangxi Beitou Road Construction&Investment Group Co.,Ltd.,Nanning 530028,Guangxi,China;Tianjin Zhonglian Gelin Science and Technology Development Co.,Ltd.,Tianjin 301617,China)

机构地区：[1]东南大学交通学院,江苏南京211189 [2]东南大学道路交通工程国家级实验教学示范中心,江苏南京211189 [3]广西北投公路建设投资集团有限公司,广西南宁530028 [4]天津中联格林科技发展有限公司,天津301617

出　　处：《重庆交通大学学报（自然科学版）》2023年第12期53-60,共8页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(41877240,41672280);吉林省交通运输科技项目(2016-1-16-2)。

摘　　要：为优化路基土水分场的调控铺设,基于水分场在路基中的迁移规律,对土工复合膨润土垫(GCL)在路基中调控水分场的影响因素进行了系统性研究。通过室内模型试验验证了GCL阻隔毛细水上升和防止雨水下渗的性能;基于水分在非饱和土路基中的迁移规律,采用数值模拟方法对GCL在路基中的铺设位置进行了优化;运用有限元分析法对比研究了现场尺度下GCL在路基中的铺设深度及铺设层数对路基水分场的影响。结果表明:GCL具有十分重要的防渗作用;在单层铺设条件下,GCL位于地面以下1.0 m处可以起到较好的调控水分场作用,GCL上、下0.3 m范围内路基土的体积含水量可以快速达到稳定状态和低值;GCL双层铺设的效果与单层铺设差异不大。In order to optimize the regulation and layout of the moisture field of the subgrade soil,based on the migration law of the moisture field in the subgrade,the influencing factors of GCL in the subgrade of the moisture field in the subgrade were studied systematically.The water-proof performance of GCL was verified through laboratory model tests,that is,blocking capillary water rise and preventing rainfall water infiltration.Then,based on the law of water migration in unsaturated soil subgrade,numerical simulation methods were used to optimize the placement of GCL in the subgrade.The finite element method was used to compare the effects of the burial depth and number of layers of GCL in the subgrade soil on the subgrade moisture field at the field scale.The results show that GCL has a very important anti-seepage effect.Under single-layer burial condition,placing GCL 1.0 m below the ground can effectively regulate the moisture field.The volumetric moisture content of the subgrade soil within a range of 0.3 m above and below the GCL can quickly reach a stable state and low value.The effect of double-layer GCL installation is not much different from that of single-layer GCL installation.

关 键 词：道路工程 土工复合膨润土垫 路基 水分场 数值模拟 

分 类 号：U416[交通运输工程—道路与铁道工程]