A fault-resistant structure for a water delivery tunnel crossing a large-scale active fault zone

Abstract

The invention discloses an anti-dislocation structure for a water delivery tunnel crossing a large-scale movable fault zone. The anti-dislocation structure comprises a crossing fault zone expanded excavation segment and adjacent fault zone gradient segments at two ends of the crossing fault zone expanded excavation segment, wherein the crossing fault zone expanded excavation segment and the adjacent fault zone gradient segments respectively comprise a tunnel preliminary bracing layer, a secondary lining layer and a foam concrete buffer layer which are arranged from outside to inside; the crossing fault zone expanded excavation segment further comprises a cavity; a plurality of hinging segments are distributed in the secondary lining layer of the crossing fault zone expanded excavation segment along the longitudinal direction of a tunnel, shearable transverse seams are formed between the adjacent hinging segments, circumferential steel bars and longitudinal steel bars are distributed in the hinging segments, and the longitudinal steel bars are hooped to the circumferential steel bars; and longitudinal connecting ribs respectively connected with the adjacent hinging segments are further arranged in the secondary lining layer of the crossing fault zone expanded excavation segment. According to the anti-dislocation structure, by virtue of the comprehensive design of expansion of a deformation space, buffering and hinging, the dislocation with a relatively high magnitude can be accommodated; the water delivery function is not influenced during the faulting; and the water delivery quality is guaranteed.

Description

technical field [0001] The invention relates to the field of water delivery tunnels, in particular to a fault-resistant structure of a water delivery tunnel passing through a large-scale active fault zone. Background technique [0002] The long-distance water diversion project in western my country is limited by the alignment and topography, and often needs to cross Holocene active faults. These active faults may have strong seismic activity today. They are new in age, large in scale, and (relatively) active. , There have been large and strong earthquakes in history, and it has the structural conditions for relatively strong earthquakes. The impact of active faults on the dislocation of water tunnels is mainly manifested in two aspects: one is that when the active faults cause earthquakes due to stick-slip movement, dislocations along the faults will cause the problem of shear resistance of water tunnels; the other is the Holocene activity. The destructive effect of the cumu...

AI Technical Summary

Problems solved by technology

This method is less adaptable to the situation where the fracture dislocation is more severe

Images