Tunnel lining waterproof joint

Abstract

The invention relates to a tunnel lining waterproof joint. The tunnel lining waterproof joint comprises a primary lining layer, a waterproof layer, a deformation layer and a secondary lining layer which are sequentially distributed from outside to inside along the section of a tunnel. A flexible joint body is arranged in the annular direction of the tunnel and divides the deformation layer and the secondary lining layer into two adjacent parts in the longitudinal direction of the tunnel. The section of the flexible joint body is in a T shape. The first width of the portion, located in the deformation layer, of the flexible joint body is larger than the second width of the portion, located in the secondary lining layer, of the flexible joint body. The flexible joint body is filled with plastic concrete material. The plastic concrete material is prepared from, by weight, 10-20 parts of cement, 70-80 parts of sand, 20-30 parts of water, 70-90 parts of stone, 2-4 parts of additive, 2-4 parts of bentonite and 6-9 parts of clay. Plastic concrete is adopted as the filling material of a T-shaped deformation joint, the seepage path of seepage water can be prolonged, anti-seepage performance is improved, and the breakage probability of a boundary is reduced.

Description

technical field [0001] The invention belongs to the technical field of lining structures of tunnels or tunnel engineering, and in particular relates to a tunnel lining waterproof joint. Background technique [0002] There are many areas in my country, especially in the southwestern region, where geological and topographical conditions are complex, crustal movement is active, and active faults are developed. Many hydropower tunnels and highway (railway) tunnels inevitably pass through active fault zones. In the part where the tunnel spans the active fault, the creeping slip caused by the active fault and the one-time dislocation caused by the earthquake will cause serious damage to the tunnel lining. At present, the following methods are usually used in engineering for the lining structure of tunnels spanning active fault zones: [0003] (1) Overexcavation + filling: Enlarging the excavation section and adopting two-layer lining. The outer lining fault is larger than the no...

AI Technical Summary

Problems solved by technology

[0006] The traditional joint structure has poor waterproof performance and is the weak link in the waterproofing of the entire tunnel. Moreover, when it encounters fault dislocation, it is very prone to shear damage, resulting in a further decline in the anti-seepage performance

At the same time, at present, foam concrete is often used as filling material for flexible joints, which has good deformation performance but poor anti-seepage effect

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