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饱和城市固废一维降解固结解析解

陈云敏, 郭淇钢, 徐晓兵, 李卓峰

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. DOI: 10.11779/CJGE201612001
引用本文: 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. DOI: 10.11779/CJGE201612001
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CHEN Yun-min, GUO Qi-gang, XU Xiao-bing, LI Zhuo-feng. Analytical solution for one-dimensional degradation-consolidation of saturated municipal solid waste[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(12): 2137-2146. DOI: 10.11779/CJGE201612001
Citation: CHEN Yun-min, GUO Qi-gang, XU Xiao-bing, LI Zhuo-feng. Analytical solution for one-dimensional degradation-consolidation of saturated municipal solid waste[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(12): 2137-2146. DOI: 10.11779/CJGE201612001
shu

饱和城市固废一维降解固结解析解  English Version

  • 1. 软弱土与环境土工教育部重点实验室（浙江大学）,浙江 杭州 310058;
    2. 浙江大学岩土工程研究所,浙江 杭州 310058;
    3. 浙江工业大学岩土工程研究所,浙江 杭州 310014

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（41402249）
详细信息
    作者简介:

    陈云敏(1962- ),男,中国科学院院士,长江学者特聘教授,主要从事软弱土静动力特性及处理技术方面。E-mail: chenyunmin@zju.edu.cn。

    通讯作者:

    徐晓兵，E-mail：xiaobingxu@zjut.edu.cn

Analytical solution for one-dimensional degradation-consolidation of saturated municipal solid waste

  • 1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China;
    2. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
    3. Institute of Geotechnical Engineering, Zhejiang University of Technology, Hangzhou 310014, China

摘要

    摘要
  • 摘要: 填埋后的城市固废因降解产生固相质量损失,从而造成在外力作用下的固结是一个相当复杂的过程。为研究饱和城市固废的降解固结特性,建立了一维降解固结普遍模型;基于已有城市固废降解、压缩和渗透特性研究,获得了考虑可降解固相水解、胞内水释放为孔隙水及降解导致压缩性衰变的一维降解固结简化模型;基于简化模型,针对饱和城市固废填埋层底部淤堵不透水和顶部自由排水工况,获得了一维降解固结解析解。针对国内填埋场新鲜城市固废的计算结果表明：在瞬时常荷载作用下,固结初期,填埋层底部的超静孔压值会超过初始值,这主要是因为降解引起固相质量损失导致骨架疏松、压缩性增大;固结后期,整个填埋层出现负的超静孔压,这是因为后期填埋层孔隙比因固相质量损失而增大,而压缩性衰变相对较小。参数敏感性分析表明：降解引起的次压缩速率越大,固结初期超静孔压越大;增加填埋层的先期固结压力会延缓超静孔压的消散。
    Abstract: Owing to loss of solid mass of municipal solid waste (MSW), the consolidation under external loading is complex. In order to study the degradation-consolidation behavior of saturated MSW, the universal model for the one-dimensional (1-D) degradation-consolidation is established. A simplified 1-D degradation-consolidation model considering hydrolysis of degradable solid, formation of pore water due to intra-particle water release and degradation-dependent compressibility is derived based on the existing research 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 solution to a simplified 1-D degradation-consolidation model is derived. Case studies are carried out for the fresh MSW in landfills of China. The results show that the excess pore water pressure being larger than the initial value is found in deeper waste layer during the early stage of consolidation under an instantaneous constant loading. This is mainly due to loosened soild skeleton, increasing compressibility associated with loss of solid mass. The excess pore water pressure is found to be negative in the whole waste during the later stage of consolidation. The reason is that the loss of solid mass causes the increasing void ratio, while the increase of compressibility is relatively smaller. The sensitivity analysis shows that an increase of the secondary compression rate causes the increasing excess pore water pressure during the early stage of consolidation, and its dissipation will be delayed with the increasing preconsolidation pressure.
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  • 收稿日期:  2015-08-19
  • 发布日期:  2016-12-24

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