Geomembrane is a flexible anti-seepage geosynthetic material, and the stability of the support layer below it is one of the keys to the safety of the anti-seepage geomembrane. If the underlying support layer has obvious uneven deformation or local corrosion, it will cause local tearing of the geomembrane, forming a leakage channel and threatening engineering safety.
Therefore, it is necessary to analyze the stress and strain of the geomembrane and the supporting layer below it to determine the safety of the geomembrane. Geomembrane is a flexible material used for reservoirs, and the entire basin of the reservoir is not affected by deep overload. During the construction and placement process, the geomembrane is usually in a relaxed state, and the geomembrane and soil will deform and coordinate during the operation of the storage tank.
Geomembrane is a flexible structure that deforms with the deformation of the reservoir basin. Under the action of water pressure, as the soil in the reservoir deforms toward the center of the reservoir, the geomembrane on both sides of the reservoir is in tension, while the geomembrane in the middle of the reservoir is in a compressed state, which conforms to the deformation of the reservoir basin. The general law. Under the action of water pressure, the soil deformation in the Xianrenshan Reservoir Basin is dominated by subsidence deformation. The maximum subsidence occurs in the center of the bottom of the reservoir, with the largest thickness and depth of the overburden. Affected by the U-shaped boundary between the rock and the soil at the bottom of the reservoir basin, the soil on both sides of the reservoir basin deforms toward the center of the reservoir basin. The soil deformation profile in the reservoir area is uniform and continuously distributed, and the geomembrane has no obvious unfavorable uneven deformation.
The stress and strain distribution of the composite geomembrane in the reservoir is basically consistent with the deformation of the soil in the reservoir basin. The geomembrane on both sides of the reservoir is in tension, and the geomembrane in the middle of the reservoir is in compression. The maximum tensile strain per unit width appears in the middle and lower part of the left bank slope, but the amplitude is not large. The tensile and deformation safety factor of geomembrane is greater than 5.0. Geomembrane can adapt to the deformation of underground soil with a certain safety factor.
