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Stress-strain state of the seam with zigzag geosynthetic diaphragm

Vestnik MGSU 9/2018 Volume 13
  • Sainov Mikhail P. - Moscow State University of Civil Engineering (National Research University) (MGSU) Candidate of Technical Sciences, associate professor of the Department of hydraulic and hydraulic construction, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Zverev Andrey O. - Moscow State University of Civil Engineering (National Research University) (MGSU) postgraduate, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Sklyadnev Mikhail K. - Moscow State University of Civil Engineering (National Research University) (MGSU) student, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.

Pages 1080-1089

Subject: despite the accumulated experience in the construction of ground dams with anti-filtration elements from geosynthetic products, the response of geosynthetic products in the structure of ground dams have been little studied. It was not determined whether positive stretch values can arise in the polymeric anti-filtration elements and whether they can threaten integrity of anti-filtration elements. For this, studies of the stress-strain state are required. The recent results of investigations of the physico-mechanical properties of contacts of polymeric geomembranes with soils allow us to study the behavior of geosynthetic products in the structure of soil dams. One of the possible designs - a high ground seam with a zigzag geosynthetic diaphragm - has been studied here. Materials and methods: investigations of the stress-strain state of the seam were carried out using numerical simulation. Calculations were carried out for a wide range of physico-mechanical properties of the geomembrane and the contact of geomembrane with the soil. The modulus of linear deformation of the polymer material, the angle of internal friction, and the tangent stiffness of the contact were varied. Results: the results of studies of the analyzed seam designs have shown that, in the main, the stresses in the geomembrane are determined by the modulus of linear deformation of the polymer material. The higher the stiffness of geomembranes, the higher are the tensile stresses in them. The shear characteristics of the geomembrane-soil contact are also important. The lower the shear strength of the contact, the higher are the tensile stresses in the geomembrane. Conclusions: the most vulnerable point of the zigzag diaphragm is its upper anchors, because it is in them that the greatest tensile stresses occur. It is recommended to turn them to the bottom side. In the diaphragm of the considered structure, it is impossible to use a geomembrane made of polyethylene; it is necessary to use a geomembrane made of PVC.

DOI: 10.22227/1997-0935.2018.9.1080-1089

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Rationale for the use of protective gaskets made of geotextiles and permeability evaluation of impervious coatings made of geomembranes

Vestnik MGSU 3/2015
  • Kosichenko Yuriy Mikhaylovich - Russian Research Institute of Land Improvement Problems (ROSNIIPM) Doctor of Technical Sciences, Professor, Deputy Director for Science, Russian Research Institute of Land Improvement Problems (ROSNIIPM), 190 Baklanovskiy prospekt, Novocherkassk, Rostov region, 346400, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Baev Oleg Andreevich - Russian Scientific Research Institute of Land Improvement Problems (RSRILIP) Candidate of Technical Sciences, Senior Researcher, Russian Scientific Research Institute of Land Improvement Problems (RSRILIP), 190 Baklanovskiy, Novocherkassk, Rostov oblast, 346400, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 48-58

The purpose of this paper is to design rationale for the use of protective pads of geotextiles and geomembranes permeability of PD using these pads. In order to justify the use of protective pads made of geotextile for reducing the defectiveness geomembrane soil fractions, the existing formulas to determine the thickness of the film element of impervious devices were examined. The calculations according to the formulas show that HDPE geomembrane with a minimum thickness of 1,0 mm, the protective lining of the geotextile should be applied at the average diameter fractions of soil of more than 6,5 mm, and for geomembranes HDPE - at a diameter of soil fractions of over 15,5 mm. In order to estimate the permeability of the TFG geomembrane using additional protective linings of geotextile in the scientific article the basic design schemes of such coatings with one and two layers of protective linings of geotextiles were considered. The evaluation results of water permeability of impervious surfaces with geotextile and for comparison - without geotextiles are given in a table. As it is shown by the data presented for the design scheme with a single layer of geotextile geomembrane at the base (in the presence of small holes in the geomembrane) the decrease the effectiveness of an anti-covering is more than 268,0 %, and for the settlement scheme covering with two layers of geotextile there will be a very large reduction in the efficiency, which almost completely reduces the effectiveness of the coating to the value of the geomembrane permeability of a soil layer without geomembrane with the filtration flow rate of 71,75 m
3/day, against water permeability of the geomembrane cover - 38,52 m
3/day. From the foregoing, it can be concluded that the application of a coating design of well filtering gaskets made of geotextile is justified in terms of protecting the geomembrane from mechanical damage, but greatly reduces the effectiveness of impervious cover in case of its damage.

DOI: 10.22227/1997-0935.2015.3.48-58

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  8. Sol’skiy S.V., Orlova N.L. Perspektivy i problemy primeneniya v gruntovykh gidrotekhnicheskikh sooruzheniyakh sovremennykh geosinteticheskikh materialov [Prospects and Problems of Using Modern Geosynthetics]. Izvestiya VNIIG im. B.E. Vedeneeva [Proceeding of the VNIIG]. 2010, vol. 260, pp. 61—68. (In Russian)
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WORKABILITY OF THE ZIGZAG POLYMER DIAPHRAGM OF HIGH EARTHFILL COFFERDAM

Vestnik MGSU 5/2017 Volume 12
  • Zverev Andrey Olegovich - PAO “Federal Hydro-Generating Company RusHydro” Chief Specialist, Department of Hydraulic Engeneering, PAO “Federal Hydro-Generating Company RusHydro”, 51 Arkhitektora Vlasova str., Moscow, 117393, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Sainov Mikhail Petrovich - Moscow State University of Civil Engineering (National Research University) Candidate of Technical Sciences, Associate Professor, Hydraulics and Hydraulic Engineering Department, Moscow State University of Civil Engineering (National Research University), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 490-495

There are considered the results of stress-strain state analysis of polymer diaphragm in the body of the 50 m high earthfill cofferdam of Gibe III dam. The diaphragm is made of polyvinylchloride (PVC) geomembrane and has a zigzag location. Computations were conducted with the finite element method. A thin geomembrane was modeled by rod-shaped finite elements. Computations showed that the diaphragm made of geomembrane is a sufficiently safe seepage-control element: there are small tensile stresses on its individual sections. The geomembrane damage may occur in it only in the part anchored to the upstream shell. Considerable tensile stresses appear in anchors which are comparable with the geomembrane tensile strength. If the geomembrane is made of PVC, there will be a margin of safety. It is not recommended to anchor the diaphragm into the upstream shell but make it only into the downstream shell.

DOI: 10.22227/1997-0935.2017.5.490-495

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