填埋场生活垃圾焚烧飞灰边坡稳定性分析  

Stability Analysis of Municipal Solid Waste Incineration Fly Ash Slope in Landfill

作　　者：邱清文 Qiu Qingwen(Shanghai Institute of Environmental Engineering and Design Science Co.,Ltd.,Shanghai 200232,China;Shanghai Environmental Sanitation Engineering Design Institute Co.,Ltd.,Shanghai 200232,China)

机构地区：[1]上海市环境工程设计科学研究院有限公司,上海200232 [2]上海环境卫生工程设计院有限公司,上海200232

出　　处：《市政技术》2024年第7期190-195,205,共7页Journal of Municipal Technology

基　　金：国家重点研发计划(2023YFC3711600)。

摘　　要：现阶段,卫生填埋仍是我国生活垃圾焚烧飞灰处置的主流技术。然而关于飞灰的土力学特性研究相对较少,不利于指导飞灰填埋作业。因此,对我国南方某填埋场飞灰的土力学特性进行了测试。首先采用岩土工程分析软件Geo-Studio中的Sigma/w模块分析了飞灰边坡逐层堆高后的应力场和变形场;然后将Sigma/w模块分析得到的应力场和变形场输入Slope/w模块,分析得到了飞灰边坡的稳定安全系数;最后分析了飞灰边坡不同坡比和不同堆高条件下的稳定安全系数,并计算了对应的填埋场库容。研究结果显示:经有机螯合剂稳定化处理后的飞灰可归类为级配不良粉砂;飞灰边坡内部水平应力和垂直应力均随着深度的增加而增大,垂直应力受水平应力的影响随飞灰边坡坡度的增加而增大;采用飞灰实际强度参数进行飞灰边坡堆高设计可显著增加库区的有效库容。At present,sanitary landfill is still the mainstream technology for the disposal of municipal solid waste incineration(MSWI)fly ash in China.However,very little research on the soil mechanical properties of fly ash has been conducted,which is not conducive to guiding fly ash landfill operations.Therefore,the soil mechanical properties of fly ash from a landfill site in southern China were tested.First,the stress field and deformation field of the fly ash slope after incremental layering were analyzed by the Sigma/w module of the geotechnical engineering analysis software Geo-Studio;Then,the stress field and deformation field obtained by Sigma/w module were input into the Slope/w module to obtain the stability safety factor;Finally,the stability safety factors of the fly ash slope were analyzed under different slope ratios and different stacking heights.The corresponding landfill capacities were calculated.The results indicate that the fly ash stabilized by chelating agent can be classified as poorly graded sand;The internal horizontal stress and vertical stress of fly ash slope increase with the increase of depth.The effect of horizontal stress on vertical stress increases with the increase of slope.Designing fly ash slope with actual strength parameters can significantly increase the effective storage capacity of reservoir area.

关 键 词：生活垃圾焚烧飞灰 土力学特性 有限元法 边坡稳定性 应力 变形 库容 

分 类 号：X705[环境科学与工程—环境工程]