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STUDY ON THE MASS TRANSFER PARAMETERS AND BARRIER PERFORMANCE FOR LINER OF CONTROLLED TYPE LANDFILL SITE

控制型垃圾填埋场衬垫传质参数及阻隔性能研究

基本信息

批准号：
20560467
负责人：
HIOKI Kazuaki
金额：
$ 2.91万
依托单位：
Osaka Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2008
资助国家：
日本
起止时间：
2008 至 2010
项目状态：
已结题

项目摘要

In this study, ion seepage tests were conducted by using fine-grained soil with permeability coefficients (k) ranging from 1.0×10^<-6> to 1.0×10^<-10> m/s. In the tests, density flow and molecular diffusion were induced by giving the concentration gradient but not the hydraulic gradient to investigate the parameters affecting the movement of fine-grained soil in an inverse problem approach. Numerical analyses were also performed to evaluate the barrier performance of the fine-grained soil. The study revealed that (1) the permeability coefficient k of a bentoniteasoil mixture and the effective diffusion coefficient D_d^* are dependent on effective porosity n_e, (2) it may be possible to estimate the effective porosity n_e of a bentoniteasoil mixture and the effective diffusion coefficient D_d^* with relative ease from the consistency limit and (3) there is a considerable difference in barrier performance between a 5.0-meter-thick soil layer (barrier layer) with a permeability coefficient k of 1.0×10^<-7> m/s and a 0.5-meter-thick barrier wall with a permeability coefficient k of 1.0×10^<-8> m/s.

在这项研究中，离子渗透试验使用细粒土，渗透系数（k）从1.0×10^<-6>到1.0×10^<-10>m/s。在试验中，通过给定浓度梯度而不是水力梯度来诱导密度流和分子扩散，以反问题方法研究影响细粒土运动的参数。数值分析也进行了评估的细粒土的屏障性能。研究表明：（1）膨润土-油混合物的渗透系数k和有效扩散系数D_d^* 与有效孔隙度n_e有关，（2）可以根据稠度极限相对容易地估算出膨润土-油混合物的有效孔隙度n_e和有效扩散系数D_d^*;（3）在渗透系数k为1.0×10^m/s的5.0米厚的土层（屏障层）和渗透系数k为1.0 <-7>×10^ m/s的0.5米厚的屏障墙之间<-8>，屏障性能有相当大的差异。