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CCL吸附特性及孔隙率降低对污染物运移的影响

ISSN号：1000-7598
期刊名称：岩土力学
时间：0
页码：1181-1187
语言：中文
分类：TV131.2[水利工程—水力学及河流动力学]
作者机构：[1]大连理工大学海岸和近海工程国家重点实验室／土木水利学院岩土工程研究所,大连116024
相关基金：国家自然科学基金资助项目（No.50679015）：中国科学院武汉岩土力学研究所湖北省环境岩土工程重点实验室开放课题资助项目（No.T110504）.
相关项目：海洋土的工程特性及其地基的变形机理研究

关键词：孔隙率计算公式, 压实黏土衬里(CCL), 含水层, 污染物, 穿透能力, approximate formula of sorption-induced porosity reduction, compacted clay liner（CCL）, aquifer, contaminant, breakthrough capacity

中文摘要：

假定孔隙均匀地分布于土体的物质空间内和土骨架对污染物的吸附特性服从平衡线性，对基本体积质量关系进行分析，提出了由于土体对污染物的吸附而引起的孔隙率降低的估算公式。在考虑土体孔隙率变化的条件下，建立了污染物一维运移的控制方程，并考虑垃圾生物降解效应、压实黏土衬里（CCL）防渗层、下覆有限厚度含水层等实际情况，确定了初始条件和边界条件。对所建立的初边值问题进行了数值求解，且对某假想填埋场情况进行了变动参数与对比计算，结果表明，由于土颗粒对污染物的吸附所引起的孔隙率降低，显著地降低了污染物对压实黏土衬里的穿透能力。与常孔隙率情况相比，CCL中污染物的峰值浓度降低近10%，含水层中污染物浓度降低更显著。当考虑土体孔隙率变化时，弥散对污染物运移具有控制作用，分布系数对污染物的运移具有重要影响。

英文摘要：

It is assumed that voids are uniformly distributed in the substance space occupied by soils and the sorption of soil skeleton onto the contaminants behaves equilibrium and linear feature. Based on the analysis of basic interrelationship between volume and mass, an empirical formula is presented for evaluating the change of the porosity induced by sorption of soil skeleton. Under the condition of variable porosity, the governing equation for describing one-dimensional contaminant migration is established; and the initial conditions and boundary conditions are formulated for actual conditions including landfill profile, waste degradation and compacted clay liner （CCL） of finite depth in practice. The resulting initial boundary-values issue is numerically solved. Through parametric computations and comparative analyses, it is shown that the reduction of soil porosity induced by sorption of soil skeleton will decrease the breakthrough potential of contaminants into compacted clay liners. Compared with the case of constant porosity, the peak of concentration of contaminant transport in CCL will be reduced 10 % when the variable porosity due to sorption is considered. When the variable effect of soil porosity is taken into account, dispersion mechanism play a controlling role in the contaminant transport and the effect of the distribution coefficient in the sorption equation on contaminant migration is appreciable.

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