Now, whether it is roads, railways, subways, especially in mountainous areas, tunnels are mostly required. The construction design of the tunnel is inseparable from geosynthetics. In modern tunnel design, after the culvert is dug, a layer of cement mortar is sprayed on the surface of the culvert, leveled, and then the geotextile is nailed to the culvert wall with a nail gun, and the waterproof board is welded, and other constructions are performed.
The four functions of Geotextile In Tunnel Drainage:
1. Protect the waterproof board
After the cave is dug, there will inevitably be many burrs on the surface of the sprayed mortar, and even some exposed sharp stones. After the geotextile is laid on the cave wall, it can protect the waterproof board from being pierced by sharp stones and burrs , resulting in leakage.
The geotextile plays a role of drainage between the cave wall and the waterproof board. The water in the mountain will seep on the wall of the cave and flow along the direction of the geotextile, that is, along the inner surface of the waterproof board to the drainage pipe.
The geotextile is located between the cement spray layer and the waterproof board. In addition to protecting the waterproof board from being punctured by sharp stones on the cave wall, it also strengthens the mechanical properties of the cement spray layer and improves the overall adhesion between the cement layer and the cave wall. , To prevent the falling and collapse of cement.
The water in the mountains tends to entrap a large amount of dirt, stones, grass blades and other impurities. If there is no geotextile filtration, the drainage pipe will soon be blocked, causing poor drainage.