Why do tunnels use geotextiles?

time：September 05, 2023 Views：281

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Why do tunnels use geotextiles?

Geotextiles can be used for foundation reinforcement. In tunnel construction, the stability of the foundation is of paramount importance. Geotextiles can prevent subsidence and deformation of the foundation by enhancing the strength and stability of the soil, thereby ensuring the safety and reliability of the tunnel project.

Geotextiles can be used for soil separation. Tunnel geological conditions are often complex and diverse, with soil layers of different particle sizes and properties. By using geotextiles for separation between soil layers, mixing and interlacing between different soil layers can be avoided, ensuring a clear and stable interface between the tunnel structure and the soil.

How to install geotextiles in tunnel projects？

Determine the central position of a waterproof board and the centerline position of the tunnel vault in the arch, and use a total station to measure the mileage of the circumferential seam of the waterproof board, so as to prevent the joint from being not vertical when the waterproof board is hung, which will cause the waterproof board to fail to double The surface is welded or there is a large bulge and tightness.

The nail-free laying of the arch of the waterproof board is the focus and difficulty of laying the whole waterproof board. Use a round soldering iron to firmly weld it with the hot-melt ring on the geotextile, and lay it from top to both sides in this order.

When all welding is completed, a welding machine is used to weld the overlap seam of the two waterproof panels.

What kind of geotextile is used for tunnels?

Tunnels generally use filament geotextiles or short filament geotextiles.

Filament geotextiles are produced from polyester chips with good quality and high strength.

Short-filament geotextiles are produced from polyester staple fibers, which are light in weight and low in strength.

The tunnel uses geotextiles between 300 grams and 400 grams, and the design width is relatively narrow, between 3 meters and 4 meters.

When laying, first mark the longitudinal centerline at the vault of the tunnel, and leave enough margin according to the unevenness of the base surface, and lay from the arch to the side walls on both sides.

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