岩土力学2024，Vol.45Issue(3)：759-768,796,11.DOI:10.16285/j.rsm.2023.0422
土工袋抑制膨胀土冻胀性能试验及机制探讨
Experimental study and mechanism exploration of soilbags for inhibiting frost heaving performance of expansive Soil
摘要
Abstract
In the cold region,frost heave damage in water conveyance channels constructed on expansive soil poses a significant threat to project sustainability.This study aims to investigate the evolution and physical mechanisms of frost heave inhibition by soilbags for expansive soils with varying water contents and dry densities.Standard calibration tests for sample preparation and frost heave deformation tests were conducted on expansive soils with and without soilbag constraints.The test results demonstrate a direct correlation between the compaction height of the sample and its dry density,enabling precise control of the dry density by adjusting the compaction height.Regardless of the presence of soilbag constraints,the relationship between frost heave deformation and time can be divided into three stages:cold shrinkage,rapid freezing and freezing stability.The frost heave of the expansive soil was significantly reduced under the restraint of the bag for samples with the same initial state,indicating that the soilbag can effectively inhibit the frost heave of the expansive soil.Moreover,as water content and dry density increased,the frost heave rate of the samples exhibited a significant increase.The frost heave inhibition rate of the soilbag increased significantly with the increase of dry density,but it did not increase notably with increasing water content.The intrinsic mechanism of soilbag inhibiting frost heave of expansive soil is revealed using the theory of segregation potential and the principle of reinforcement constraint.A conceptual model of the skeleton structure of frozen expansive soil under the influence of soilbag constraints is proposed,based on the pore diameter distribution curve obtained through mercury intrusion porosimetry.This model better explains the variations in the evolution of frost heave inhibition rates of soilbags under different water contents and dry densities.关键词
膨胀土/土工袋/干密度/含水率/冻胀特性Key words
expansive soils/soilbag/dry density/water content/frost heave characteristic分类
建筑与水利引用本文复制引用
张勇敢,鲁洋,刘斯宏,田金博,张思钰,方斌昕..土工袋抑制膨胀土冻胀性能试验及机制探讨[J].岩土力学,2024,45(3):759-768,796,11.基金项目
国家自然科学基金(No.52109123) （No.52109123）
中央高校基本科研业务费专项资金(No.B220203029) （No.B220203029）
江苏省研究生科研与实践创新计划项目(No.KYCX21_0511).This work was supported by the National Natural Science Foundation of China(52109123),the Fundamental Research Funds for the Central Universities(B220203029)and the Postgraduate Research and Practice Innovation Program of Jiangsu Province(KYCX21_0511). （No.KYCX21_0511）
