Shotcrete in tunneling

Shotcrete in tunneling

The function of shotcrete in the tunnel is to create a semi-hard coating immediately on the excavated rock or soil.
In order for shotcrete to adhere well to the stone surface, it must have a high initial strength, a high degree of plasticity and toughness, and prevent the movement of the ground. With its ability to withstand cutting and anchoring, shotcrete prevents the sliding of wedges with the possibility and tendency to fall due to the strength of adhesion to the stone surface. Shotcrete can also act as a shell and carry radial loads.
In soft ground, shotcrete acts as a protection for the wall and roof of the tunnel from weathering and gradual destruction. In addition, shotcrete is used as a supplement to the maintenance of the tunnels, which are maintained with a wire mesh.
Shotcrete can be very useful in some fields, such as marl, which can swell and shrink in the open air, and prevent them from weathering. But if the ground is watery, shotcrete is not very effective and does not create good adhesion with the ground. In addition, groundwater is usually sulfated and destroys cement.

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This post is written by Sobhan_Yaran