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

doi:10.3969/j.issn.1674-0696.2023.12.08

Abstract

Abstract: 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.

Key words: highway engineering; geosynthetic clay liner (GCL); road subgrade; moisture field; numerical simulation

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。

关键词: 道路工程；土工复合膨润土垫；路基；水分场；数值模拟

CLC Number:

U416

LIU Zhibin1,2，WANG Yuting1,2，LUO Tingyi3，TANG Yasen3，XIE Shiping4. Feasibility of Using GCL for Regulating Road Subgrade Moisture Field and Optimization of the Installation Position[J]. Journal of Chongqing Jiaotong University(Natural Science), 2023, 42(12): 53-60.

刘志彬1，2，王宇婷1，2，罗婷倚3，唐亚森3，谢世平4. GCL用于路基水分场调控可行性及铺设位置优化分析[J]. 重庆交通大学学报（自然科学版）, 2023, 42(12): 53-60.

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