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THE GMATECHLINE answers all
| 题名： | THE GMATECHLINE answers all |
| 正文语种： | eng |
| 作者： | George R. Koerner |
| 摘要： | Q: We are using Robert Koerner's Designing with Geosynthetics to calculate the required thickness of a geomembrane. See Figure 1 and Equation 1 from the book for details. Can you point us in the right direction with the mobilization distance, x? A: Yes, please see Figure 2 for high-density polyethylene (HDPE). It shows ASTM D6706 Standard Test Method for Measuring Geosynthetic Pullout Resistance in Soil results for saturated silty sand. It is rather shocking how short the geomembrane lengths need to be to mobilize the strength of the geomembrane. These results certainly confirm that geomembranes are not meant for reinforcement. Q: We are a large liner installation firm that has been asked to install a geomembrane liner from low gradient to high gradient. Is this the new normal? A: This is not normal, and we suggest you strongly object to this recommendation. There are many stakeholders in regard to panel layout (i.e., installer, general contractor, regulator, design owner, etc.). All have schedules and are involved with tasks, such as subgrade approval, access, geometry and weather. However, the installer is generally the one holding the short end of the stick when water gets under a deployed liner system. In short, rework is not fun. The geomembrane should be installed from high to low. Get support from the International Association of Geosynthetics Installers (IAGI) on this issue, if needed. |
| 出版年： | 2021 |
| 期刊名称： | Geosynthetics |
| 卷： | 39 |
| 期： | 2 |
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