Laboratory measurement and prediction to the permeability of bentonite-modified loess as a landfill liner

被引：0

作者：

Zhang Hu-yuan ^{[1
]}

Zhao Tian-yu ^{[1
]}

Wu Jun-rong ^{[2
]}

Yan Geng-sheng ^{[1
]}

Feng Lei ^{[1
]}

机构：

[1] Lanzhou Univ, Minist Educ, Key Lab Mech Disaster & Environm Western China, Lanzhou 730000, Gansu, Peoples R China

[2] China Municipal Engn Northwest Design Inst Co Ltd, Lanzhou 730000, Gansu, Peoples R China

来源：

ROCK AND SOIL MECHANICS | 2011年 / 32卷 / 07期

关键词：

modified loess; bentonite; permeability; liner; landfills;

D O I：

暂无

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Mixing of bentonite to a native soil is a convenient and economic means to make an impermeable earthen liner for landfills in a region where natural clay is deficient. In this investigation, laboratory permeability tests were conducted on the compacted specimens of loess and bentonite mixtures to study the feasibility of bentonite-modified loess as a landfill liner material. Two kinds of loess soils with different grain size compositions, the Lanzhou loess soil (LH) and Yulin loess soil (YH), were mixed with various contents of bentonite, and compacted to the maximum density for the measurement of permeability by a flexible-wall permeameter. The variation relationship between permeability coefficient and bentonite addition levels was analyzed; and the minimum addition of bentonite to loess soils was determined with respect to the regulations to MSW landfill liner. Scanning electronic microscopy (SEM) was conducted to observe the microstructure of the compacted loess soils with different contents of bentonite addition. It was found that the larger pores existed originally in loess soils were transformed into a larger number of small pores by bentonite addition, which is mainly responsible for the reduction of soil permeability. Based on the test data, a regression penetrative model governing the permeability and the bentonite addition was established for practical prediction.

引用

页码：1963 / +

页数：8

共 26 条

[11] PREDICTING HYDRAULIC CONDUCTIVITY OF CLAY LINERS
DANIEL, DE
[J]. JOURNAL OF GEOTECHNICAL ENGINEERING-ASCE, 1984, 110 (02): : 285 - 300
[12] Goldman L.J., 1990, CLAY LINERS WASTE MA
[13] Grim R, 1978, BENTONITE GEOLOGY MI
[14] KENNY T C, 1992, CANADIAN GEOTECHNICA, V29, P264
[15] KOEMER R, 1993, EPA600R93182 US ENV
[16] LIU Chang-li, 2000, ACTA GEOSCIENTIA SIN, V21, P98
[17] [刘阳生 Liu Yangsheng], 2002, [应用基础与工程科学学报, Journal of Basic Science and Engineering], V10, P143
[18] [刘月妙 Liu Yuemiao], 2003, [矿物岩石, Journal of Mineralogy and Petrology], V23, P42
[19] LUNDGREN T A., 1981, P 10 INT C SOIL MECH, P349
[20] Mitchell JK., 1965, J SOIL MECH FDN DIV, V91, P41, DOI [10.1061/JSFEAQ.0000775, DOI 10.1061/JSFEAQ.0000775]

← 1 2 3 →