Advanced detection, grouting reinforcement and excavation method of wide separation fracture of high-pressure water-rich tunnel

Abstract

The invention discloses an advanced detection, grouting reinforcement and excavation method of a wide separation fracture of a high-pressure water-rich tunnel. The advanced detection, grouting reinforcement and excavation method comprises determining the level of surrounding rock of the tunnel to reach above the third level through advanced geological detection on the tunnel; building a wall for grouting on the tunnel face and drilling at least three detection and drain holes in the lower middle portion of the wall for grouting; calibrating at least fifteen grouting hole positions on the wall for grouting along the inner circumference of a tunnel excavation contour line separately; measuring the water yield of every detection and drain hole after drilling grouting of the at least fifteen grouting hole positions is achieved; performing direct tunneling when the maximum water yield of the single hole is measured to be not more than 10 liters every meter*minute; increasing and drilling detection and drain holes when the maximum water yield of the single hole is measured to be more than 10 liters every meter*minute and not more than 20 liters every meter*minute until the maximum water yield of the single hole is measured to be not more than 10 liters every meter*minute and performing the tunneling; performing whole section curtain grouting construction when the maximum water yield of the single hole is measured to be more than 20 liters every meter*minute and performing the tunneling.

Description

technical field [0001] The invention relates to a tunnel and underground engineering construction method, in particular to a method for advanced forecasting, grouting reinforcement, detection effect and excavation of a high-pressure water-rich tunnel. Background technique [0002] During the construction of new railway tunnels, various special strata are often encountered, such as: cracks, broken zones, weak interlayers, karst caves, etc., and such special strata are often accompanied by high-pressure rich water, which brings great difficulties to tunnel construction. and security risks. At present, when the domestic railway engineering field encounters similar special strata, the construction measures of advancing full-section curtain grouting are adopted to reinforce and improve the stratum. However, each project has its particularity. Water, some projects need to take into account both water blocking and reinforcement, and also combined with advanced large pipe shed supp...

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned prior art construction method has the following shortcomings and deficiencies: the full-section curtain grouting construction method is adopted, and the grouting reinforcement and water blocking effect are good, but the grouting period is long, resulting in a relatively slow overall construction progress. The entire construction period is seriously delayed

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