Weerasinghe I A, Gallage C, Dawes L
Science and Engineering Faculty, Queensland University of Technology, Australia.
School of Civil and Environmental Engineering, Science and Engineering Faculty, Queensland University of Technology, Australia.
Heliyon. 2021 Jan 4;7(1):e05770. doi: 10.1016/j.heliyon.2020.e05770. eCollection 2021 Jan.
Geosynthetic clay liners are a rapidly evolving geosynthetic product used in most hydraulic barrier applications in the geo-environmental industry. Continuous research has led to new insights to overcome the shortcomings faced in deploying GCLs in the field. These include shrinkage due to shear failure on side slopes, the effect of temperature variation, and inadequacy of minimum timely confinement to achieve optimum hydraulic performance. This paper presents previous experimental data and an additional dataset from this research gathered to observe the effect of overburden confining stress on GCL hydraulic conductivity and how the findings can be used to predict the performance of a geosynthetic clay liner for a given field application. An inverse power relationship is identified between these two parameters along with the reduction in the order of the degree of hydraulic conductivity depending on the permeant material passing through. A relationship is determined to estimate the GCL hydraulic conductivity as a function of the overburden confining stress, given that it is pre or post hydrated and the permeant liquid passing through the product. It is proposed that the relationship can be used to predict the GCL hydraulic performance in the field and provide guidance in improving the serviceability of hydraulic barrier designs.
土工合成粘土衬垫是一种快速发展的土工合成材料产品，用于地质环境行业的大多数水力屏障应用中。持续的研究带来了新的见解，以克服在现场部署土工合成粘土衬垫时面临的缺点。这些缺点包括边坡上由于剪切破坏导致的收缩、温度变化的影响以及最小及时围压不足导致无法实现最佳水力性能。本文展示了之前的实验数据以及本研究收集的额外数据集，以观察上覆围压对土工合成粘土衬垫水力传导率的影响，以及这些发现如何用于预测给定现场应用中土工合成粘土衬垫的性能。确定了这两个参数之间的幂反比关系，以及根据通过的渗透材料不同，水力传导率程度的降低顺序。确定了一种关系，用于估计土工合成粘土衬垫的水力传导率，该关系是上覆围压、其是否预水化或后水化以及通过该产品的渗透液体的函数。建议该关系可用于预测现场土工合成粘土衬垫的水力性能，并为改善水力屏障设计的适用性提供指导。
