Direction and location slurry injection reinforcing method for particular area in giant rock heap loose body with large porosity

Abstract

The invention discloses a directional positioning grouting reinforcement method for a specific area in a large rock heap loose body with a large porosity. Sleeve valve layered grouting process is adopted, and quick-setting expansion grout is injected layer by layer to form a surrounding grout-stop curtain wall. The bottom grout-stop curtain wall is closed with the surrounding grout-stop curtain walls to form a "U"-shaped grout-stop curtain that limits the grouting reinforcement range of the rock pile. Cement water glass double slurry is used for grouting construction of "U" type grout-stop curtain inside the grout-stop curtain. Finally, ordinary cement slurry is used in the double-layer "U" grout-stop curtain to carry out the grouting reinforcement construction of the rock heap loose body. The invention has good economical efficiency, and can effectively prevent a large amount of grout from being lost due to the overhead structure in the loose rock heap in the ordinary grouting process through the application of the "U"-shaped grouting curtains on the inner and outer layers of the grouting area. The speed is fast, the work efficiency is high, and the total management cost is low.

Description

technical field [0001] The invention relates to the technical field of directional positioning grouting reinforcement construction in a giant rock pile loose body with a large porosity, in particular to a method for directional positioning grouting reinforcement in a specific area of ​​a large rock pile loose body with a 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 pile is 26.3-48.4 meters, and the lower part of the rock pile extends into the river along the mountain. The rock piles are mainly composed of rocks of different sizes, the rock is the quartz sandstone of the Diaoyutai Formation (Z1d) in the Early Sinian system, and the diamete...

AI Technical Summary

Problems solved by technology

[0003] The entrance of the Daqian Shiling Tunnel passes through the middle of the giant rock pile with large void ratio loose body. The maximum thickness of the rock pile at the top of the tunnel is 50 meters, and the depth of the bottom of the tunnel from the bedrock at the bottom of the rock pile is more than 32 meters. Unfavorable geological conditions such as looseness and the influence of water seepage can easily form local collapses and cause rock piles to slide on the entire mountain, resulting in safety accidents, which are also extremely unfavorable to the safety of tunnel construction and railway operations.

In order to solve the problems that the large-porosity loose rock mass has no adhesive force, excavation is prone to local collapse or overall slippage, and the railway operation is easily disturbed, etc., 7 meters above the top of the tunnel, 5 meters below the bottom, and on both sides of the tunnel centerline. Grouting reinforcement is carried out within the area of ​​the 13.5-meter loose rock pile, but because the rock pile is in a loose and overhead state, the general grouting method is used, and the grouting range is extremely difficult to control, and the grout is easy to follow the overhead rocks in the rock pile Overhead voids spread into the river below, causing slurry loss and environmental pollution

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