defgf24uw
Dołączył: 01 Lis 2010
Posty: 959
Przeczytał: 0 tematów
Ostrzeżeń: 0/5
Skąd: England
|
 Wysłany: Wto 11:30, 15 Lut 2011 Temat postu: abercrombie outlet To determine the thickness of c |
|
|
To determine the thickness of composite geomembrane
Path can not be too large, so as not to pierce the geomembrane, assuming uniform rock and a diameter of 20mm, to withstand the maximum pressure head is 3.3m,[link widoczny dla zalogowanych], uniform particles closely stone, and its uniform pore size diameter of about 0.4 , that is,[link widoczny dla zalogowanych], a: 20 × 0.4 = 8mm, round consideration by the pore shape, with the formula (2) terms, T = 0.1lpa / s = 0.11 × 9.8 × 3.3 × 0. 008 / √ = 0.02846 / √ (4) obtained in Figure 3 and 0.4mm thick 0.75mm PVC film to calculate J. (4) is shown in Figure 3, curve by curve,[link widoczny dla zalogowanych], said ①, the curve of 0.75mm PVC film with tensile stress-strain curve intersection = 0.227kN / m, ? = 1.671%. The stress factor of safety 10.5/0.227 = 46.25, strain 250/1.671 safety factor: 149.6. 0.40mm PVC film of this curve and the tensile stress of Yunnan Agricultural University 882 23 Volume strain curve of intersection of T = 0.177kN / m, 8 = 2.643%. The stress safety factor of 5.6/0.177 = 31.64, strain safety factor is 210/2.643 = 79.5. At present, no geomembrane design safety factor of stress and strain factor of safety norms. Former Soviet Union, the All-Union Institute of Hydraulic propose to allow use of ultimate tensile stress the tensile stress of 1 / 5. Therefore, this paper, the safety factor of 5. Although both the thickness of the film are far from meeting the requirements of the stress factor of safety, but the specification clear water projects generally use a thickness of 0.5mm, while the majority of practical applications in the 0.3 ~ 0.5mm between the J, from the economic point of view, so use 0.4mill PVC membrane. l020304050 pull inotropic e Figure 3 curve intersection Method geomembrane thickness Fig. Hydraulic with the All-Union Academy of 3Calculationofthecompositegeomembrane'Sthicknesycurveintersectionmethod formula (3) calculation, including: water depth H = 3.3m, allowing the membrane tension 6 ∞ = 22x10Pa, membrane elastic modulus E = 388x10Pa, d = 20mm, thickness is calculated is 0.268mm
[link widoczny dla zalogowanych]
[link widoczny dla zalogowanych]
[link widoczny dla zalogowanych]
Post został pochwalony 0 razy
|
|
FAQ
Szukaj
Użytkownicy
Grupy
Galerie
Rejestracja
Zaloguj się, by sprawdzić wiadomości
Zaloguj
