四川典型红层区生活垃圾填埋场衬层土壤防渗性能研究  

Research on Anti-seepage Performance of Liner Soil of Landfill in Typical Red Layer Areas of Sichuan Province

作　　者：刘磊 韩智勇[1,2,3] 何山[1,2,3] 冯诗杰 胡馨然 LIU Lei;HAN Zhiyong;HE Shan;FENG Shijie;HU Xinran(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Chengdu University of Technology),Chengdu Sichuan 610059;State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil&Water Pollution(Chengdu University of Technology),Chengdu Sichuan 610059;College of Ecology and Environment,Chengdu University of Technology,Chengdu Sichuan 610059;Sichuan Jiashengyu Environmental Protection Technology Co.Ltd.,Chengdu Sichuan 610041)

机构地区：[1]地质灾害防治与地质环境保护国家重点实验室(成都理工大学),四川成都610059 [2]国家环境保护水土污染协同控制与联合修复重点实验室(成都理工大学),四川成都610059 [3]成都理工大学生态环境学院,四川成都610059 [4]四川嘉盛裕环保技术有限公司,四川成都610041

出　　处：《环境卫生工程》2023年第2期1-7,14,共8页Environmental Sanitation Engineering

基　　金：地质灾害防治与地质环境保护国家重点实验室自主课题(SKLGP2021Z009)。

摘　　要：填埋场衬层土壤大多取自附近土壤,衬层的防污性能与土壤的渗透特性密切相关。通过对四川省典型红层区填埋场附近不同深度的6种粒径区间的筛分土样开展标准固结试验,研究红层区土壤的基本物理参数、压缩固结过程中饱和密度以及渗透系数的变化趋势和规律。试验结果表明:固结前期(P≤800 kPa),红层筛分土饱和密度(ρ_(sat))变化范围为0.13~0.25 g/cm^(3),固结后期(800 kPa<P<3 200 kPa)为0.11~0.18 g/cm^(3),且均呈对数增加,同时,ρ_(sat)与孔隙比e两者之间呈强线性负相关(r>0.99)。筛分红层土的压缩固结主要集中于12.5~800 kPa的竖向压力区间。竖向压力大于800 kPa时,红层筛分粉黏土适合作为填埋场防渗系统中的土壤衬层。同时,基于已有的lgkv-lge渗透模型,提出了2种适用于不同粒径区间红层土的lgkv-lgρ_(sat)线性及非线性拟合渗透模型,以期为我国红层区填埋场等工程建设项目的选址、地下水污染的评价和修复提供一定的理论依据。The soil of landfill liners was derived mainly from nearby area.There was a close correlation between the antipollution capacity of liners and soil permeability.The standard consolidation experiment was carried out on the sieved soil with six particle size ranges at different depths near the typical red-layer landfill in Sichuan Province,so as to study the fundamental physical parameters and the trend of changes in saturated density and permeability coefficient.According to the experimental results,the saturated density of red-layer sieved soil(ρ_(sat)) ranged from 0.13 to 0.25 g/cm^(3)at the early consolidation stage(P≤800 kPa),and it was from 0.11 to 0.18 g/cm^(3) at the later stage(800 kPa<P<3 200 kPa),both showed a trend of logarithmical increase.Besides,there was a significant linear negative correlation between theρ_(sat) and the void ratio e(r>0.99).The consolidation of sieved soil in the red layer was mainly concentrated in the vertical pressure range from 12.5 to 800 kPa.When the vertical pressure exceeded 800 kPa,the sieved silty clay in the red layer was applicable as the soil-protecting layer in the impervious system of landfill.Meanwhile,based on the existed seepage model(lgkv-lge),two types of linear and nonlinear fitting seepage models(lgkv-lgρ_(sat))were constructed for the red-layer soil with different particle sizes.It was expected to provide a theoretical guidance on site selection of construction projects such as landfills in the red layer areas,as well as the pollution assessment and remediation of groundwater in China.

关 键 词：红层 衬层土壤 饱和密度 防渗性能 填埋场 

分 类 号：X705[环境科学与工程—环境工程] X799.3