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赤泥渗滤液对钠基膨润土黏土衬垫的渗透机理分析

李芹 廖才能 廖明旭 彭道平 黄涛

李芹, 廖才能, 廖明旭, 彭道平, 黄涛. 赤泥渗滤液对钠基膨润土黏土衬垫的渗透机理分析[J]. 环境工程, 2021, 39(1): 148-153. doi: 10.13205/j.hjgc.202101023
引用本文: 李芹, 廖才能, 廖明旭, 彭道平, 黄涛. 赤泥渗滤液对钠基膨润土黏土衬垫的渗透机理分析[J]. 环境工程, 2021, 39(1): 148-153. doi: 10.13205/j.hjgc.202101023
LI Qin, LIAO Cai-neng, LIAO Ming-xu, PENG Dao-ping, HUANG Tao. MECHANISMS CONTROLLING HYDRAULIC CONDUCTIVITY OF BENTONITE CLAY LINERS WITH BAUXITE LIQUOR[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(1): 148-153. doi: 10.13205/j.hjgc.202101023
Citation: LI Qin, LIAO Cai-neng, LIAO Ming-xu, PENG Dao-ping, HUANG Tao. MECHANISMS CONTROLLING HYDRAULIC CONDUCTIVITY OF BENTONITE CLAY LINERS WITH BAUXITE LIQUOR[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(1): 148-153. doi: 10.13205/j.hjgc.202101023

赤泥渗滤液对钠基膨润土黏土衬垫的渗透机理分析

doi: 10.13205/j.hjgc.202101023
基金项目: 

四川省科技计划项目(2019YJ0244);软弱土与环境土工教育部重点实验室(浙江大学)开放基金(2019P04)。

详细信息
    作者简介:

    李芹(1985-),女,博士,主要研究方向为固体废弃物处理处置、工业固体废物的岩土力学特性及化学分析。liqin2017@my.swjtu.edu.cn

    通讯作者:

    彭道平(1985-),男,博士,副教授,主要研究方向为工程水环境效应及其控制、工业固体废物的岩土力学特性及化学分析。pdp0330@swjtu.cn

MECHANISMS CONTROLLING HYDRAULIC CONDUCTIVITY OF BENTONITE CLAY LINERS WITH BAUXITE LIQUOR

  • 摘要: 赤泥渗滤液的高离子强度可以抑制蒙脱石的膨胀,从而导致钠基膨润土黏土衬垫(GCL)的渗透性过强,并无法用作赤泥处理设施中的防渗衬层。通过2种钠基膨润土黏土衬垫与2种赤泥渗滤液的渗透过程,研究强碱性赤泥渗滤液与钠基膨润土黏土衬垫的渗透机理。结果表明:天然钠基膨润土(Na-GCL)和人工钠化钠基膨润土(Ar-GCL)的渗透系数与赤泥渗滤液的离子强度密切相关,随着离子强度的增加,渗透系数呈递进式系统性增大,对高离子强度的山东赤泥渗滤液的渗透系数最大,分别为7.8×10-7,3.2×10-7 m/s。且两者的渗透系数与膨胀指数呈正相关,SEM扫描的微观结构分析发现,膨润土的膨胀机理控制着其渗透作用。高离子强度会使膨润土中的蒙脱石矿物层间发生渗透性膨胀,并吸收大量的水分,减小孔隙度的同时改变流体的流动路径,从而导致渗透系数提高。该结果可为赤泥堆场底部防渗设计提供更为可靠的理论参考,有效降低我国赤泥堆场渗滤液污染风险。
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出版历程
  • 收稿日期:  2019-12-12
  • 网络出版日期:  2021-04-23

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