A construction method for medium-controlled grouting reinforcement range of large-porosity giant rock heap loose body

Abstract

The invention discloses a construction method for controlling the grouting reinforcement range in a huge rock heap loose body with large porosity, measuring and setting the grouting hole positions of the grouting curtain around the grouting reinforcement area. Use a large-scale pipe drilling rig to drill into the grouting curtain grouting hole. Inject the sleeve valve housing material. Insert the grouting core pipe and complete the grouting of the grouting curtain holes row by row to form a grouting curtain wall that limits the surrounding area of ​​the grouting reinforcement area. Rows of jump holes are drilled into the grouting holes in the grouting reinforcement area. When the grouting at the bottom 3 meters of all the grouting drilling holes is completed, the grouting curtain wall at the bottom of the grouting reinforcement area is formed. The bottom grout-stop curtain wall is cross-closed with the surrounding grout-stop curtain walls, and finally forms a "U"-shaped grout-stop curtain that controls the scope of grouting reinforcement. The "U" grout-stop curtain wall formed on the periphery of the specific grouting reinforcement area can effectively prevent the loss of a large amount of grout caused by the overhead structure in the loose body of the rock pile when the ordinary grouting process is used. The construction speed is fast, the work efficiency is high, and the total management cost is reduced. Low.

Description

technical field

[0001] The invention relates to the technical field of grouting reinforcement construction for giant rock heap loose bodies with large porosity, in particular to a construction method of a "U"-shaped grouting curtain used for controlling the grouting reinforcement range of giant rock heap loose bodies with large porosity. Background technique

[0002] The scale of rock piles at the entrance of Daqian Shiling Tunnel is extremely large. The range of rock piles covers almost the entire mountain body from the foot of the mountain to the top of the mountain. The rock piles are wedge-shaped with thin upper part and thicker lower part attached to the mountain body. °, the thickness of the rock mound is 26.3-48.4 meters, and the vertical thickness of the rock mound body is as deep as more than 50 meters. The lower part of the rock mound body extends into the river along the mountain. The rock pile is mainly composed of rocks of different sizes and a small amount of s...

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