A construction method of waterproof and consolidated structure for tunnels passing through debris flow deposits

Abstract

The invention provides a construction method of a waterproof solidification structure for penetrating through a debris flow accumulation body tunnel. The construction method of the waterproof solidification structure for penetrating through the debris flow accumulation body tunnel comprises the following steps that S1, construction is prepared; S2, surveying and setting out are carried out; S3, drilling machine positioning and drilling are carried out; S4, drilling is carried out; S5, a grouting pipe is buried and a pipe opening is blocked; S6, grouting is carried out; and S7, grouting is completed. Grouting holes are drilled for 2-5 turns, a hole arrangement mode is quincuncial pile type hole arrangement, and a spacing between every two adjacent holes is 950mm-1050mm; and deviation of a practical drilling position and a designed position of the holes is controlled within a range of 5cm, and the hole depth is 0.5m-0.6m longer than the length of the buried grouting pipe. Grouting liquidfor grouting is a mixture of cement, water, sodium silicate and a retarder, and a water cement ratio is (0.7-1) to 1; the concentration of the sodium silicate is 35-40 baume degrees, and a volume ratio of the sodium silicate to cement paste is 1 to 1; and the dosage of the retarder is 11-11.5Kg / m<3>. By using the construction method of the waterproof solidification structure for penetrating through the debris flow accumulation body tunnel, a good reinforcing and water stop role can be played on surrounding rock penetrating through the debris flow accumulation body tunnel, the construction time is short, the operation cycle index is less, and the production efficiency is high.

Description

technical field [0001] The invention relates to a construction method for a waterproof consolidation structure passing through a debris flow accumulation body tunnel, and belongs to the technical field of civil engineering. Background technique [0002] Debris flow deposits are composed of round gravel, breccia and phyllite with different particle sizes, and partially mixed with sandy water-saturated loess. It has large porosity, is full of water, and has underground mobility. The overall bearing capacity is low. During the construction of the debris flow accumulation tunnel, because the excavation range of the tunnel is rich in surface water, the surrounding rock of the tunnel is loose and lacks sufficient compactness. During the excavation process, the surface water is prone to seepage, causing water seepage and landslides, etc. , Seriously affect the efficiency of tunnel excavation and the safety of construction personnel. The traditional small conduit grouting method, b...

AI Technical Summary

Problems solved by technology

[0002] Debris flow deposits are composed of round gravel, breccia and phyllite with different particle sizes, and partially mixed with sandy water-saturated loess. It has large porosity, is full of water, and has underground mobility. The overall bearing capacity is low. During the construction of the debris flow accumulation tunnel, because the excavation range of the tunnel is rich in surface water, the surrounding rock of the tunnel is loose and lacks sufficient compactness. During the excavation process, the surface water is prone to seepage, causing water seepage and landslides, etc. , seriously affecting the efficiency of tunnel excavation and the safety of construction personnel

The traditional small conduit grouting method, because of its small construction scale and small reinforcement range, the effect after grouting is uncertain and the reliability is relatively poor. The effect of this method is very limited, and it takes more time and cycles, the construction time period is long, and the efficiency is not high. This method cannot meet the construction requirements of tunnels passing through debris flow accumulation bodies.

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