Abstract
Synthetic materials such as nonwovens, mats and membranes have been commonly used in civil engineering for many years. The changes of geotextile characteristics in time (permeability, porosity, etc.) are poorly understood. Many authors have presented the changes in the properties of synthetic materials, mainly based on laboratory tests. The studies on geotextile samples taken from working hydraulic structures are not so many. Over 40 years, the reduction in the permeability of nonwoven geotextile was about four-fold. Probably the reason for that reduction is mechanical clogging caused by fine particles which have moved from the earth dam soil to the nonwoven geotextile. Over 40 years of operations, despite the reduction in permeability of the nonwoven geotextile, the drainage worked properly. The experiment was conducted in the field and laboratory and a two-dimensional numerical model built in software package HYDRUS (two-dimensional/three-dimensional (2D/3D)) Standard was proposed. The field measurements allow calibration and validation of the numerical model. The conducted simulations showed that at a maximum water level in the reservoir equal to 3.32 m, the water supply to the drainage is higher from upstream than from downstream. Particularly, water supply from above to the drainage is absent.
Highlights
Synthetic materials such as nonwoven geotextiles, mats, membranes or geogrids are commonly used in many branches of construction [1]
We can say that we know the methods of testing the physical properties of different geosynthetics [3,4], we can determine the criteria for their selection depending on their function in construction [5,6], and failures and bad solutions provide us with additional knowledge [7,8]
Times)than thanthe thepermeability permeabilitycoefficient coefficientofofearth earthdam damsoil. Both our own research and that of other authors indicate that a significant change in permeability of nonwoven geotextile comes after the first 10 years of drainage work
Summary
Synthetic materials such as nonwoven geotextiles, mats, membranes or geogrids are commonly used in many branches of construction [1]. During the operation of the geotextile as a filtering layer, due to changes occurring, we can distinguish five characteristic periods: migration of soil particles, flow of the finest particles, formation of filter/non-woven structure (filter cake), fine particle retention in geotextile (clogging), and stabilization of the protected ground. These processes usually are not linear and the duration of each of them depends on the volume flow of water flowing through the surface of geotextile Q/A (m3 s−1 m−2 ). The attempt to determine the influence of clogged nonwoven geotextile on water flow in soil using HYDRUS (two-dimensional/three-dimensional (2D/3D)) Standard is another challenge
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