稳定化垃圾飞灰的力学特性及填埋体稳定性分析  

Mechanical Properties and Landfill Stability of Stabilized Waste Fly Ash

作　　者：汪明亮 李琦 李宁 李梦慧 唐露 范惜辉 李磊[2] 祁长青[2] WANG Mingliang;LI Qi;LI Ning;LI Menghui;TANG Lu;FAN Xihui;LI Lei;QI Changqing(Nanjing Environmental Group Co.Ltd.,Nanjing 210026,China;School of Erath Sciences and Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]南京环境集团有限公司,南京210026 [2]河海大学地球科学与工程学院,南京211100

出　　处：《河南科学》2024年第5期677-683,共7页Henan Science

基　　金：南京市碳达峰碳中和科技创新专项(202211011);国家重点研发计划项目(2020YFC1908702-01)。

摘　　要：垃圾飞灰颗粒细、堆积密度较小、易吸水,与一般的固体废弃物具有完全不同的力学特性.针对南京某垃圾飞灰填埋场工程,对稳定化飞灰的力学特性和填埋体的稳定性进行了研究.结果发现,稳定化飞灰的黏聚力随着含水率的增加而先增大后减小,而摩擦角呈现单调减小的趋势;随着初始含水率的增加,飞灰填埋体的稳定性逐渐降低,提出了最优化的飞灰初始含水率建议;降雨对飞灰堆体的稳定性具有一定程度的影响,通过对本地区暴雨工况的模拟,在降雨5 d的情况下,填埋体稳定性系数降低了0.13~0.26,但填埋体仍能保证稳定状态;填埋体底部渗滤液对填埋体的稳定性具有较大影响,在渗滤液深度超过3 m的情况下,填埋体即有发生失稳破坏的可能性.研究结果可以为飞灰填埋的设计和施工提供参考.Fly ash from garbage contains fine particles,has low stacking density,and is prone to water absorption,exhibiting mechanical properties that are vastly different from those of general solid waste.This study investigated the mechanical properties of garbage fly ash and the stability of the landfill body in a garbage fly ash landfill project in Nanjing.The results indicate that as water content increases,the cohesion of stabilized fly ash initially rises and subsequently falls,while the friction angle demonstrates a monotonic decreasing trend.With increasing initial moisture content,the stability of the fly ash landfill gradually decreases.An optimized initial moisture content for stabilized fly ash is proposed.Rainfall has a significant impact on the stability of fly ash landfills.Through simulation of rainstorm conditions in the region,it was found that the stability coefficient of the landfill could decrease by 0.13 to 0.26 after 5 d of rainfall.However,the landfill can still maintain stability.Leachate at the bottom of the landfill significantly affects the stability of the landfill.If the depth of the leachate exceeds 3 m,there is a risk of landfill failure.These research findings can serve as a reference for the design and construction of fly ash landfills.

关 键 词：垃圾飞灰 力学强度 地下水 降雨入渗 填埋体稳定性 

分 类 号：X705[环境科学与工程—环境工程]