Advanced detection, shock isolation and advanced transverse opposite-pull anchor rod system of ultra-small clear distance tunnel

Abstract

The invention relates to an advanced detection, shock isolation and advanced transverse opposite-pull anchor rod system for an ultra-small clear distance tunnel. The advanced detection, shock isolation and advanced transverse opposite-pull anchor rod system is used for excavating the ultra-small clear distance tunnel and comprises an advanced detection unit and a shock insulation and advance transverse opposite-pull anchor rod unit, wherein the advance detection unit is used for longitudinally drilling an advance horizontal drill hole in a tunnel follow-up hole along the contour of the side wall of the tunnel follow-up hole after a tunnel lead-in hole is excavated, and an in-hole television probe used for identifying the damage condition of the surrounding rock through advanced horizontal drilling; and the shock insulation and advance transverse opposite-pull anchor rod unit is drilled from the tunnel lead-in hole to the advanced horizontal drill hole of the tunnel follow-up hole and forms a transverse anchor rod drill hole of a cross hole with the advanced horizontal drill hole, and an opposite-pull anchor rod which is formed by lowering an anchor rod and a pre-tensioning anchor head from the tunnel lead-in hole, opening the pre-tensioning anchor head at the cross hole and applying prestress. Compared with other methods in the prior art, the method is simple in construction, low in manufacturing cost and high in applicability, is not limited by topographic conditions and overall line types, and is of great significance to tunnel engineering.

Description

technical field [0001] The invention belongs to the fields of geological engineering, geotechnical engineering, tunnel and underground construction engineering, and relates to a tension bolt system, in particular to an advanced detection, seismic isolation and advanced lateral tension bolt system for ultra-small clear distance tunnels and the same. How to use and apply. Background technique [0002] Small clear distance tunnel refers to a special tunnel structure in which the thickness of the middle wall rock (middle rock) column between tunnels is less than the recommended value of the tunnel specification. According to the experience of a large number of completed small clear distance tunnels and relevant domestic scientific research results, Generally, the clear distance of the tunnel should be greater than 6.0-8.0m. The ultra-small clear distance tunnel (clear distance ≤ 6.0m) is a special tunnel structure with a clear distance smaller than that of ordinary small clear ...

AI Technical Summary

Problems solved by technology

However, because the distance between the centers of the two caverns is small, the stress field will interact in space during the excavation process between the two caverns of the ultra-small distance tunnel, which is extremely unfavorable for the safety of tunnel construction.

Moreover, the stability and bearing capacity of the interlayer rock layer in the tunnel are unstable. For tunnels with weak interlayer rock surrounding rock strength, it is difficult to self-stabilize without protection.

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