Ground-surface fixed-point deep hole layered grouting construction method

Abstract

The invention discloses a ground-surface fixed-point deep hole layered grouting construction method. The method comprises the steps that vertical drilling is conducted from the ground surface of a construction area to the interior of the area needing to be grouted, wherein the hole depth is set to range from 80 meters to 150 meters; after the depth of a finished hole reaches the designed depth, a type-I sleeve valve tube (100) is put into the tail end of the drilled hole, designed grouting segments, put into the drilled hole, of a type-II sleeve valve tube (200) are connected segment by segment, and non-designed grouting segments, put into the drilled hole, of a type-III sleeve valve tube (300) are connected segment by segment; after the sleeve valve tubes are installed, a casing shell material is injected into a gap formed between the outer walls of the sleeve valve tubes and the inner wall of the drilled hole for hole sealing; after hole sealing is completed and solidifying is achieved, grouting core pipes (600) are put into the drilled hole; the tail end of the first grouting core pipe (600) penetrates through a stop-grouting plug (700) to be connected with the stop-grouting plug (700), and the other grouting core pipes (600) are connected segment by segment and then put into the sleeve valve tubes till the stop-grouting plug (700) is put into the bottoms of the sleeve valve tubes; a grouting pipe is connected to the core pipe end, grouting liquid is prepared, and then grouting operation starts through the grouting core pipes (600).

Description

technical field [0001] The invention relates to the technical field of rock and soil engineering, in particular to a construction method for strengthening rock and soil. Background technique [0002] With the increasing scale of railway construction, there are more and more high-speed railway tunnels. During the tunnel construction process, the surrounding rock undergoes large deformation, the stability becomes poor, and landslide disasters occur frequently. When the tunnel construction reaches the fault fracture zone, due to the sudden drop in the grade of surrounding rock and the fact that the fault fracture zone is often rich in groundwater, the original initial support design is difficult to maintain the stability of the surrounding rock, and large-scale landslides occur. In addition, the shallow buried section of the tunnel has a thin covering layer and poor stability of the surrounding rock, and engineering accidents such as landslides are prone to occur during excava...

AI Technical Summary

Problems solved by technology

But this invention still has the following disadvantages or deficiencies: (1), this method is not suitable for the reinforcement of shallow buried sections of tunnels crossing fault fracture zones; (2), this method uses constant grouting pressure for grouting, which is difficult to adapt to Surrounding rock characteristics of different fault fracture zones; (3) The material of the sleeve valve is polyvinyl chloride (PVC), which is difficult to withstand large load-bearing pressure, and the maximum depth can only reach about 30-40 meters, which is difficult to be used in deep holes Grouting

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