降解对垃圾土压缩回弹特性的影响  

Effects of bio-chemical degradation on compression-swelling behaviour of solid waste

作　　者：刘晓东[1,2] 施建勇[1,2] 高海 

机构地区：[1]河海大学岩土工程研究所,南京210098 [2]岩土力学与堤坝工程教育部重点实验室,南京210098 [3]深圳市政府投资审计专业局,深圳518008

出　　处：《深圳大学学报（理工版）》2011年第6期535-540,共6页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(50879022);江苏省高校研究生科技创新计划资助项目(CXZ211-0427)~~

摘　　要：采用人工配制的垃圾土样进行压缩回弹对比试验,通过对垃圾土中有机质含量和降解环境的控制,得到试样的压缩与回弹曲线,分析降解作用和有机质含量对垃圾土压缩及回弹特性的影响规律.结果表明,有机质含量越高,垃圾土的压缩性越强,回弹性也越强;有机质含量相同时,与抑制降解下垃圾土的压缩性相比,考虑降解时的垃圾土呈现更高压缩性,但表现出较小的回弹性.降解对垃圾土压缩的影响表现出前期影响大、后期影响较小的规律,这种变化与生化降解规律一致.建议分3段选取压缩系数:0～25、25～200和200～400 kPa,以全面描述垃圾土瞬时压缩、非线性压缩及线性压缩的能力.Tests of compression-swelling were carried out with two group specimens under different organic content and different degradation conditions.The results show that the higher organic content is,the higher compressibility is,and the higher swelling it shows; Compared to specimen under restraining degradation condition,specimen with the same organic content under degradation condition shows higher compressibility and lower ability of swelling. The effect of bio-chemical degradation on compression behaviour of solid waste was higher in anterior period and lower in latter period,having the same rule as bio-chemical degradation.It is suggested that coefficient of compression should be selected in 3 phases：0~25 kPa,25~200 kPa,200~400 kPa.This could indicate all-sided compressibility as instantaneous compression,nonlinear compression and liner compression.The study in this paper can provide some guidance to landfill design and filling construction.

关 键 词：环境岩土工程 垃圾土 压缩回弹性 有机质含量 生化降解 

分 类 号：X705[环境科学与工程—环境工程]