岩土工程学报2016，Vol.38Issue(12)：2137-2146,10.DOI:10.11779/CJGE201612001
饱和城市固废一维降解固结解析解
Analytical solution for one-dimensional degradation-consolidation of saturated municipal solid waste
摘要
Abstract
Owing to loss of solid mass of municipal solid waste(MSW), theconsolidationunder external loadingis complex. In order to study thedegradation-consolidation behavior of saturated MSW, theuniversalmodelfor the one-dimensional (1-D) degradation-consolidationis established. A simplified 1-Ddegradation-consolidation model considering hydrolysis of degradable solid, formationof pore water due to intra-particle water release anddegradation-dependent compressibility is derivedbased on theexistingresearch achievements of degradability,compressibility and permeability of MSW. The top and bottom boundary conditions of waste layer are assumed to be free-draining and impervious, respectively. The analytical solutionto a simplified 1-D degradation-consolidation modelis derived. Case studies are carried out for the fresh MSW in landfills ofChina.The results show thatthe excess pore water pressurebeing larger than the initial value is found in deeper waste layer during the early stage of consolidation under aninstantaneous constant loading. This ismainlydue to loosened soild skeleton, increasing compressibilityassociated with loss ofsolid mass.The excess pore water pressure is found to benegative in the whole waste during thelater stage of consolidation.The reason is that the loss of solid mass causes theincreasing void ratio, while theincrease of compressibility is relatively smaller.The sensitivity analysis shows that an increase ofthe secondary compression rate causestheincreasingexcess pore water pressure during the early stage of consolidation, and its dissipation will be delayedwith the increasingpreconsolidation pressure.关键词
固结/降解/城市固废/饱和/超静孔压Key words
consolidation/degradation/municipal solid waste/saturation/excess pore water pressure分类
建筑与水利引用本文复制引用
陈云敏,郭淇钢,徐晓兵,李卓峰..饱和城市固废一维降解固结解析解[J].岩土工程学报,2016,38(12):2137-2146,10.基金项目
国家重点基础研究发展计划“973”计划项目（2012CB719800）；国家自然科学基金项目 （）
