垃圾填埋场传统封顶和ET封顶的比较研究

›› 2009, Vol. 30 ›› Issue (2): 509-514.

垃圾填埋场传统封顶和ET封顶的比较研究

陆海军^{1, 2}，栾茂田^{1, 2}，张金利^{1, 2}

1. 大连理工大学土木水利学院，大连 116024；2. 大连理工大学海岸和近海工程国家重点实验室，大连116024

收稿日期:2007-05-18 出版日期:2009-02-10 发布日期:2011-01-27
作者简介:陆海军，男，1979年生，博士研究生，主要从事渗流与环境岩土工程方面的研究。
基金资助:
国家自然科学基金资助项目（No.50639010；50678032）。

Research on comparison between traditional compacted clay and evapotranspiration cover systems of landfill

LU Hai-jun ^{1, 2}, LUAN Mao-tian ^{1, 2}, ZHANG Jin-l i ^{1, 2}

1. School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China; 2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China

Received:2007-05-18 Online:2009-02-10 Published:2011-01-27

摘要/Abstract

摘要：

针对传统压实黏土封顶系统存在易干燥开裂的问题，提出了一种新型的ET（蒸发传输）封顶系统。分析了压实黏土封顶系统和新型ET封顶系统的工作机制。在降水和蒸发循环补给的条件下，建立了水分在两种封顶系统中迁移的一维数学模型。以9次降水和蒸发循环补给为边界条件，分别模拟了576 h的水分在两种封顶系统中迁移变化规律。计算结果表明，距补给边界越近，含水率受降水、蒸发的影响越显著，且随着深度的增加出现明显的峰值滞后现象。传统封顶中的压实黏土层由于具有低渗透性，致使整层不能得到有效的水分补给。ET封顶中整个土层可以有效地从边界降水中得到补给，同时在蒸发的条件下，把土层中的储水释放。数值计算结果与试验数据的对比表明，计算值和试验数据基本吻合。这些研究成果有助于垃圾填埋场封顶系统的设计作进一步的改进。

关键词: 压实黏土, 封顶系统, 干燥开裂, 蒸发蒸腾, 土壤含水率

Abstract:

The traditional compacted clay cover system of landfill is studied for desiccation cracks. A new evapotranspiration (ET) landfill cover system is proposed. The mechanisms of compacted clay and ET cover are analyzed. On the basis of considering precipitation and evaporation, a one-dimensional vertical unsaturated soil moisture movement model is developed. The model is used to predict 576h moisture distribution law under 9 charge periods. Results show that the moisture content near the surface is highly sensitive to climate loading; and the effect is significantly attenuated and time lagged along with increasing depth. The compacted clay layer of the traditional landfill cover has low penetrability; so it can not get effective moisture charge. ET cover acts as a reservoir that stores moisture during precipitation events and subsequently returns it to atmosphere as evapotranspiration. It is reasonable agreement between model simulation and measured data. According to this analysis, these results may be used to assist in making decisions regarding proposed modification to the design of the cover system.

Key words: compacted clay, cover system, desiccation cracks, evapotranspiration, soil moisture content

中图分类号:

TP 391.9

陆海军，栾茂田，张金利. 垃圾填埋场传统封顶和ET封顶的比较研究[J]. , 2009, 30(2): 509-514.

LU Hai-jun, LUAN Mao-tian, ZHANG Jin-li. Research on comparison between traditional compacted clay and evapotranspiration cover systems of landfill[J]. , 2009, 30(2): 509-514.

参考文献

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

本文评价

推荐阅读 10

[1]	向天兵，冯夏庭，陈炳瑞，江权，张传庆. 三向应力状态下单结构面岩石试样破坏机制与真三轴试验研究[J]. , 2009, 30(10): 2908 -2916 .
[2]	杨光，孙逊，于玉贞，张丙印. 不同应力路径下粗粒料力学特性试验研究[J]. , 2010, 31(4): 1118 -1122 .
[3]	闻世强，陈育民，丁选明，左威龙. 路堤下浆固碎石桩复合地基现场试验研究[J]. , 2010, 31(5): 1559 -1563 .
[4]	张常光，张庆贺，赵均海. 非饱和土抗剪强度及土压力统一解[J]. , 2010, 31(6): 1871 -1876 .
[5]	杨天鸿，陈仕阔，朱万成，刘洪磊，霍中刚，姜文忠. 煤层瓦斯卸压抽放动态过程的气-固耦合模型研究[J]. , 2010, 31(7): 2247 -2252 .
[6]	胡秀宏，伍法权. 岩体结构面间距的双参数负指数分布研究[J]. , 2009, 30(8): 2353 -2358 .
[7]	李卫超，熊巨华，杨敏. 分层土中水泥土围护结构抗倾覆验算方法的改进[J]. , 2011, 32(8): 2435 -2440 .
[8]	张桂民，李银平，施锡林，杨春和，王李娟. 一种交互层状岩体模型材料制备方法及初步试验研究[J]. , 2011, 32(S2): 284 -289 .
[9]	王伟李小春李强石露王颖白冰. 小尺度原位瞬态压力脉冲渗透性测试系统及试验研究[J]. , 2011, 32(10): 3185 -3189 .
[10]	胡存，刘海笑，黄维. 考虑循环载荷下饱和黏土软化的损伤边界面模型研究[J]. , 2012, 33(2): 459 -466 .