Factors affecting the down-slope erosion of bentonite in a GCL |
| |
| Affiliation: | 1. Department of Sid and Reva Dewberry Civil, Environmental, and Infrastructure Engineering (CEIE), George Mason University (GMU), Fairfax, VA 22030, United States;2. Department of CEIE, GMU, Fairfax, VA 22030, United States;1. Department of Civil Engineering, National Chi-Nan University, University Road, Puli, Nantou 545, Taiwan;2. Department of Civil and Construction Engineering, National Taiwan University of Science and Technology, 43, Sec. 4, Keelung Road, Taipei 106, Taiwan;3. Department of Soil Mechanics and Foundations, University of Technical Education, Ho Chi Minh City, Viet Nam;1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, No. 1, Xikang Road, Nanjing 210098, China;2. College of Civil Engineering & Architecture, Shandong University of Science and Technology, No. 579, Qianwangang Rd., Huangdao, Qingdao, 266590, China;1. School of Civil and Environmental Engineering, Nanyang Technological University, Blk N1, 50 Nanyang Avenue, Singapore, 639798, Singapore;2. Department of Civil, Construction and Environmental Engineering, Iowa State University, 328 Town Engineering Building, Ames, IA 50011, USA;3. Geotechnical Research Institute, School of Civil Engineering, Tianjin University, 92 Weijin Road, Nankai District, Tianjin, China;1. University of Qom, Bvd. Amin, Qom, Iran;2. Cnam Paris, 2, rue Conté, 75003, Paris, France;3. Grenoble Alpes University, LTHE, Grenoble, France |
| |
| Abstract: | Leaving a composite liner exposed for an extended period can sometimes lead to down-slope bentonite erosion from geosynthetic clay liners (GCLs). This laboratory study examines a number of factors that can affect the erosion of bentonite particles with an imposed flow of water for one particular geotextile-encased, needle-punched GCL. The factors examined include the effect of an initial wet/dry cycle, water chemistry, flow rate, slope, prior cation exchange, and the effect of no-drying phase in the test cycle. No erosion was observed unless the GCL had been hydrated and dried to create a wet/dry cycle. The most critical factor was found to be the water chemistry. No erosion was observed with tap water (39 ppm calcium) with up to 360 cycles and a flow of 3 L/hour. Tests simulating the evaporation and condensation of water below an exposed composite liner by imposing deionized water on the GCL surface developed erosion holes within 5–6 cycles. |
| |
| Keywords: | Geosynthetics GCL Exposed liners Bentonite Erosion Composite liners |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
