摘要
由于MBT(mechanical-biological treatment)垃圾具有减量化的优点,可以有效减少垃圾的填埋量,因此,MBT垃圾的研究已成为国内外环境岩土工程领域研究的热点课题之一。为了全面地掌握MBT垃圾的基本土工特性,采集杭州天子岭垃圾填埋场的MBT垃圾,并对其进行成分分析、筛分试验、含水率试验、相对密度试验、天然密度试验、压缩试验、直接剪切试验及渗透试验等。结果表明:(1)MBT垃圾的成分以塑料、玻璃和灰土为主,湿质量约占总质量的57%;(2)MBT垃圾的不均匀系数为21.4,曲率系数为1.93;(3)MBT垃圾的孔隙比与压力的对数呈直线关系,压缩指数为0.726,属于高压缩性材料;(4)MBT垃圾的剪切强度符合库仑定律,得到其抗剪强度参数,黏聚力为10.8 kPa,内摩擦角为44.5°;(5)MBT垃圾的渗透系数随竖向压力的增加而减小,渗透系数的对数与压力的关系可拟合为线性关系,建立了线性关系表达式;(6)MBT垃圾渗透系数的量级范围在10-2~10^(-6)cm/s。研究结论可为MBT垃圾填埋场的库容预测、稳定性分析及渗流导排系统设计提供参考。
Mechanical-biological treatment（MBT） has the advantage of significantly reducing the amount of municipal solid waste.Therefore,MBT waste has become a hot global research topic in geo-environmental engineering.In order to understand the basic geotechnical characteristics of waste more comprehensively,MBT waste samples were collected from Tianziling landfill in Hangzhou,and tests were conducted,including a composition analysis,sieve analysis,water content test,specific gravity test,natural density test,compression test,direct shear test,and permeability test.The main components of the MBT waste from this site were plastic,glass,and dust soils,which accounted for 57% of the total wet mass.The uniformity coefficient of the MBT waste was 21.4,and the curvature coefficient was 1.93.The relationship between the void ratio and the logarithmic pressure was fitted linearly,and the compression index was calculated to be 0.726,indicating the high compressibility of the MBT waste.The shear strength of the MBT waste conformed to Coulomb′s law.The cohesion was 10.8 kPa,and the internal friction angle was 44.5°.The permeability coefficient decreased with increasing vertical pressure.The relationship between the logarithmic permeability coefficient and vertical pressure was fitted linearly.The permeability coefficients of the MBT wastes were in the range of 10-2–10-6 cm/s.These conclusions can provide reference for prediction of reservoir capacity,stability analysis and design of seepage drainage system in an MBT landfill.
作者
张振营
张宇翔
郭文强
吴大志
徐辉
王樱峰
ZHANG Zhenying;ZHANG Yuxiang;GUO Wenqiang;WU Dazhi;XU Hui;WANG Yingfeng(School of Civil Engineering and Architecture,Zhejiang Sci-tech University,Hangzhou,Zhejiang 300018,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2018年第9期2170-2179,共10页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51478436
51678532
51708508)~~
关键词
土力学
MBT垃圾
不均匀系数
压缩指数
抗剪强度
渗透系数
soil mechanics
MBT waste
uniformity coefficient
compression index
shear strength
permeabilitycoefficient
