The Role of Geomembrane Surface Roughness on Interface Behavior

9700186这项研究将加深对土工膜表面粗糙度对界面行为的影响的理解。通过利用最近开发和实施的光学剖面显微镜技术提供土工膜表面粗糙度的定量测量的综合实验方案，有望为选择设计参数和预测具有土工膜界面的复合系统的长期行为提供更合理的依据。将为这项研究制作一台定制的界面剪切仪，测试将包括使用最近开发的树脂浸渍图像分析程序测量界面区域的局部孔隙率分布，以深入了解剪切过程中织物和孔隙率的演变。实验研究将辅之以适当的分析研究。土工膜表面粗糙度和界面区局部孔隙率分布的定量测量将允许在状态范围内考察界面强度行为。在这个统一的框架内，预计剪切过程中状态的微小变化可能与土工膜表面的物理特性有关。将进行数值模拟来研究一系列界面条件，并探索用于动员界面剪切的最佳粗糙度设计。***

9700186 This research will develop an understanding of the role of geomembrane surface roughness on interface behavior. Through a comprehensive experimental program using the recently developed and implemented Optical Profile Microscopy technique to provide quantitative measures of geomembrane surface roughness, it is expected to provide a more rational basis for selecting design parameters and predicting the long-term behavior of composite systems with geomembrane interfaces. A custom interface shear apparatus will be made for this research, and testing will include measurements of the distribution of local void ratio in the interface region using a recently developed resin impregnation - image analysis procedure to provide insight into fabric and porosity evolution during shearing. The experimental studies will be complemented with appropriate analytical studies. The quantitative measures of geomembrane surface roughness and local void ratio distribution in the interface region will permit the interface strength behavior to be examined within the context of state. Within this unifying frame understanding, it is expected that small changes in state as shearing progresses can be related to the physical characteristics of the geomembrane surface. Numerical simulations will be performed to study a range of interface conditions and explore optimal roughness designs for mobilizing interface shear. ***