不同有效应力下矿山渗滤液对土工合成黏土衬垫渗透特性影响的试验研究

发布时间：2018-06-05 01:45

本文选题：土工合成黏土衬垫 + 渗透系数　；参考：《岩土力学》2017年05期

【摘要】：以模拟矿山渗滤液作为渗透溶液,使用柔性壁渗透仪,在不同有效应力条件下测定土工合成黏土衬垫(geosynthetic clay liner,GCL)的渗透系数。试验结果表明:矿山渗滤液作用下GCL渗透系数升高的幅度与其所受有效应力的大小紧密相关;当有效应力为24 kPa时,矿山渗滤液的渗透使GCL的渗透系数升高至1.52810-′m/s,比控制样(自来水渗透)的渗透系数高340倍,不能满足《一般工业固体废物贮存、处置场污染控制规范》对防渗层渗透系数的要求(k≤1.0910-′m/s)。而当有效应力为93、162、231和438 kPa时,矿山渗滤液的持续作用使GCL的渗透系数只分别升高了26、21、14和10倍,且全部满足规范要求。研究结果表明,在对矿山废弃物处置场中GCL的防渗性能进行评估时,必须考虑GCL试样在场地中的受力状态。
[Abstract]:The permeability coefficient of geosynthetic clay liner (GCL) was measured under different effective stress conditions with simulated mine leachate as a permeable solution and under different effective stress conditions. The experimental results show that the amplitude of the increase of GCL permeability coefficient under the action of the mine leachate is closely related to the size of the effective stress. When the effect is 24 kPa, the permeability of the mine leachate increases the permeability coefficient of GCL to 1.52810- 'm/s, which is 340 times higher than the permeability coefficient of the control sample (tap water penetration). It can not meet the requirements of the general industrial solid waste storage, the disposal field pollution control specification > the permeability coefficient of the impervious layer (k < 1.0910-' m/s). And the effective stress is 93162,2 At 31 and 438 kPa, the continuous action of the mine leachate makes the permeability coefficient of GCL increase only by 26,21,14 and 10 times respectively, and all meet the specification requirements. The results of the study show that the stress state of GCL in the site must be considered when evaluating the anti-seepage performance of the GCL in the mine waste disposal site.
【作者单位】：西安建筑科技大学环境与市政工程学院;中煤科工集团西安研究院有限公司水文地质研究所;
【基金】：国家自然科学基金(No.41602291) 陕西省教育厅专项科研计划项目资助(No.11JK0761) 中煤科工集团西安研究院科技创新基金(No.2015XAYMS21)~~
【分类号】：TU41

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