人民长江2024，Vol.55Issue(7)：212-220,9.DOI:10.16232/j.cnki.1001-4179.2024.07.028
酸性循环侵蚀下灰岩-土体渗透特性研究
Effect of acid cyclic corrosion on permeability characteristics of limestone-soil composite
摘要
Abstract
In order to investigate the influence of acid cyclic erosion degree on the permeability characteristics of limestone-soil composite,the limestone samples after acid cyclic corrosion and cohesive laterite were used to make a limestone-soil com-posite.A variable water head test was carried out with the hydraulic gradient of 4 to 14,and the effective corrosion depth was in-troduced to propose an analysis and calculation model of interface permeability coefficient.The results showed that the permeabili-ty curve of limestone-soil composite showed a three stages change of transient decline,relative stability and gradual rise.The fit-ting seepage velocity had a good linear relationship with the hydraulic gradient,which conforms to Darcy law.The permeability co-efficient of limestone-soil composite increased with the increasing of limestone corrosion degree,and the increase rate decreased first and then increased.The permeability coefficient of limestone interface decreased with the increasing of corrosion degree,and the decrease rate decreased sharply,inferring that the change of pore tortuosity affects the interface permeability.Comparing the theoretical seepage volume with the actual seepage volume,it can be seen that the error between them was small in the transient decline and relative stability seepage stages,proving the applicability of the model.Combined with the SEM images of limestone samples after corrosion,the comparison on permeability curves between limestone-soil composite and pure soil,and the mass loss of limestone under seepage,we concluded that the existence of rock mass structure and the change of rock microstructure will lead to the permeability enhancement of limestone-soil composite and the deterioration of water erosion resistance.关键词
水力侵蚀/酸性循环侵蚀/灰岩-土组合体/灰岩界面/渗透特性Key words
water erosion/acid cycle corrosion/limestone-soil composite/limestone interface/permeability characteristic分类
农业科技引用本文复制引用
李杰,程龙飞,孙大典,任怡桦,李雙衡..酸性循环侵蚀下灰岩-土体渗透特性研究[J].人民长江,2024,55(7):212-220,9.基金项目
在渝高校与中科院所属院所合作项目"三峡库区地质灾害大数据智能预测预警云服务平台研发及应用"(HZ2021012) （HZ2021012）
