1. Is there any influence from film transmission? After the film is laid, the infiltration line before the film rises slightly, while the infiltration line after the film decreases significantly. At the same time, the constant water headline at the bottom of the film becomes dense, and the water head behind the film drops sharply. The distribution of hydraulic gradients has also changed significantly. Before laying the film, there is a slender high hydraulic gradient area at the junction of the sandy loam soil and the clay layer, but after laying the film, the hydraulic gradient in the dike becomes smaller, while the hydraulic gradient at the bottom of the film increases significantly, indicating that the water flow has changed due to the existence of the film In the flow path, seepage is concentrated from the bottom of the membrane, that is, the anti-seepage membrane has a significant anti-seepage effect. Except for a small area at the bottom of the textured geomembrane factory price, the hydraulic gradients in other areas are all within the allowable hydraulic gradient range, and the bottom of the membrane is in the lower layer of the entire project, with a small range and no osmotic damage will occur.
2. The influence of film thickness. When the bottom of the membrane is 0.5m away from the clay layer, compared with the clay layer inserted into the bottom of the membrane, the wetting line after the membrane increases, the water head increases significantly, and the water headline at the bottom of the membrane becomes sparse, indicating the anti-seepage effect of the vertical anti-seepage membrane Greatly reduced. It can be seen that when a natural anti-seepage layer such as a clay layer exists locally, whether the clay layer is inserted into the bottom of the membrane has a great influence on the anti-seepage effect of the membrane. When the clay layer is inserted into the bottom of the membrane, a closed impermeable barrier is formed. Compared with when the clay layer is not inserted into the bottom of the membrane, the anti-seepage effect is significantly improved. When the clay layer is not inserted into the bottom of the membrane, there is a thin permeable layer between the impermeable membrane and the clay layer. When the water flows to the surroundings, a relatively strong seepage channel is formed. When the bottom of the membrane is far away from the clay layer, the thickness of the permeable layer increases, the penetration effect increases, and the anti-seepage effect of the anti-seepage membrane weaken.
When the bottom of the impermeable membrane is not laid in the clay layer, the hydraulic gradient increases in the area near the bottom of the wholesale textured geomembrane, but decreases in the clay layer. Compared with the case of no membrane, the hydraulic gradient of the clay layer at the bottom of the membrane increases, and the hydraulic gradient of the clay layer behind the membrane decreases, indicating that the water flow is concentrated in front of the membrane, and due to the change of the water flow path, more water flows behind the membrane. The upward movement reduces the concentration of seepage at the boundary of the soil layer, which is still conducive to the stability of seepage in the embankment. In addition, the hydraulic gradient of each layer (except for a small part at the bottom of the membrane) is still smaller than the allowable hydraulic gradient, so when the bottom of the membrane is not covered with the clay layer, penetration failure will generally not occur, but the anti-seepage effect of the vertical membrane will be Obvious reduction.
3. The effect of membrane rupture. When the membrane is destroyed, new seepage channels will be created, causing the redistribution of the seepage field. The infiltration line behind the membrane increased significantly, and the water head also increased greatly, especially in the damaged area. The anti-seepage effect of the vertical anti-seepage membrane is obviously reduced. The hydraulic gradient before and after the membrane produced by LDPE geomembrane manufacturers is broken obviously increases, while the hydraulic gradient in other areas decreases, indicating that the water flow through the membrane is broken, but the increase in the gradient caused by the osmotic concentration has little influence. When the dike provides a long seepage channel, it will not affect the stability of the dike. In addition, the hydraulic gradient of other layers is reduced, which is smaller than the allowable hydraulic gradient, so when the membrane is destroyed, osmotic failure will not occur.
Post time: Feb-23-2022