垃圾填埋场渗沥液pH值变化对粘土防渗层压缩性的影响  

THE EFFECT OF THE CHANGE OF PH VALUE OF LEACHATE IN LANDFILL ON THE COMPRESSION OF CLAY IMPERMEABLE LAYER

作　　者：黄方媛 魏松 张婉婷 卢昱柏 苏进源 郑海君[1] 吉锋[1] HUANG Fang-yuan;WEI Song;ZHANG Wan-ting;LU Yu-bo;SU Jin-yuan;ZHENG Hai-jun;JI Feng(College of Environment and Civil Engineering,Chengdu University of Technology Chengdu 610059,China)

机构地区：[1]成都理工大学环境与土木工程学院,成都610059

出　　处：《地质灾害与环境保护》2022年第1期102-106,共5页Journal of Geological Hazards and Environment Preservation

摘　　要：粘土防渗层是垃圾填埋设施中直接接触渗沥液的防渗层,防渗层有效地阻隔了垃圾渗沥液下渗,减少了渗沥液对环境的污染。以成都粘土为研究对象,采用高压固结试验研究粘土防渗层在不同浸润时间、不同pH渗沥液浸润下对粘土层固结参数的影响。结果表明:浸润时间和渗沥液pH对粘土固结参数的影响较大。随着浸润时间的增加,渗沥液pH值对土的压缩系数影响显著,当pH=9时土的可压缩性最大,其压缩系数较无渗沥液条件下土的压缩系数提高了2.5倍。相同时间不同pH渗沥液浸润下土的压缩系数变化表现为:在0~7 d时压缩系数显著增大,7~14 d时增量减小,但仍有增大的趋势。该研究成果可用于垃圾场设计方面的改进,为后续治理渗沥液的研究提供理论支撑。The clay impermeable layer is the impermeable layer that comes into direct contact with the leachate in the landfill facility,and the impermeable layer effectively blocks the seepage of the garbage and reduces the pollution of the leachate to the environment.With Chengdu clay as the research object,the effect of high-pressure cementing test on the cementing parameters of clay layer under different immersion time and different pH leachate leaching fluid was studied.The results show that the immersion time and leachate pH have a great influence on the clay solidification parameters.With the increase of immersion time,the pH value of leachate has a significant effect on the compression coefficient of soil,and the compressibility of soil is the largest when pH is 9,and the compression coefficient of soil is 2.5 times higher than that of soil under the condition of no leachate.The compression coefficient change of different pH leachate immersion soil at the same time is as follows:the compression coefficient increases significantly at 0 to 7 days,and decreases in increments at 7 to 14 days,but there is still an increasing trend.The research results can be used to improve the design of garbage dumps and provide theoretical support for the subsequent study of leachate treatment.

关 键 词：垃圾填埋场 渗沥液 pH 固结试验 

分 类 号：X5[环境科学与工程—环境工程] X3