Consolidation method for advance support passing through debris flow accumulation tunnel

Abstract

The invention discloses a consolidation method for an advance support passing through a debris flow accumulation tunnel, and the method comprises the following steps of: S1 leveling the ground surface, S2 surveying and setting out, S3 positioning by a drilling machine, S4 drilling the ground surface, S5 lowering a pipe, S6 sealing a hole, S7 surface grouting, S8 finishing surface grouting, S9 drilling a face, S10 burying a pipe, S11 grouting the face, and S12 finishing the face grouting. The grouting solution for grouting is a mixture of cement, water, water glass and retarder, the water-cement ratio is 0.7-1:1; the water glass concentration is 35-40 degrees Be, the volume ratio of the water glass to the cement slurry is 1:1; and the dosage of retarder is 11-11.5 kg / m3. By using the methodof the invention, the problem of water seepage and rock mass stability in the pre-excavation section before passing through the debris flow accumulation tunnel can be effectively prevented, and the weak and broken surrounding rock of the tunnel is effectively strengthened and stopped, and the number of grouting operations is small, the grouting range is wide; the construction period is short, andthe safety of tunnel construction is ensured.

Description

technical field [0001] The invention provides an advanced support consolidation method for tunnels passing through mud-rock flow accumulation bodies, and relates to the technical field of civil engineering. Background technique [0002] For tunnel engineering, the debris flow accumulation body is composed of round gravel, breccia and phyllite with different particle sizes and partially mixed with sandy saturated loess. Due to the short formation time, the structure is loose and the compactness is poor, so it is not stable. nature, it cannot be called a "rock". It has large porosity, is full of water, and has underground fluidity. The overall bearing capacity is low, which cannot meet the needs of tunnel engineering. It is necessary to carry out reinforcement treatment around the cavern and rebuild the surrounding rock to meet the needs of tunnel engineering. [0003] With the development of my country's construction industry, the country's investment in traffic engineering...

AI Technical Summary

Problems solved by technology

For the construction of tunnels crossing long debris flow gullies, due to the large construction section of double-track railway tunnels, various risks such as roof collapse, mud and water inrush, subsidence and deformation during construction are extremely high. The construction scale is small, the reinforcement range is also small, the effect after grouting is not easy to determine, the reliability is relatively poor, the range of surrounding rock reinforcement and the effect of water sealing are very limited, and it takes more time and cycles. The construction time period is long, the efficiency is low, and it is completely unable to meet the construction requirements of the tunnel through the debris flow accumulation body

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