Bolting and grouting process for governing roadway floor heave

Abstract

The invention discloses a bolting and grouting process for governing a roadway floor heave. The bolting and grouting process comprises the following steps: constructing on a lane base plate to form a shallow part grouting hole with the depth of 0.6-1.2m; after the construction of the shallow part grouting part is finished, inserting a grouting capsule pipe and starting grouting; when the slurry return phenomenon occurs on the lane base plate or the grouting pressure reaches 1MPa, stopping grouting; after the slurry in the shallow part grouting hole is solidified, constructing on the lane base plate to form a medium-depth part grouting hole with the depth of 2.5-3.5m; after the construction of the medium-depth part grouting hole is finished, inserting a grouting capsule pipe and starting grouting; when the grouting pressure reaches 2.0-3.0MPa, stabilizing the pressure for 5 minutes and stopping grouting; after slurry in the medium-depth part grouting hole is solidified, constructing on the lane base plate to form a deep part drill hole with the depth of over 5m and carrying out deep part drilling and high-pressure grouting by selecting a hollow anchor cable; when the grouting pressure reaches 3.0-5.0MPa, stabilizing the pressure for 5 minutes and stopping grouting; and repeating the steps until the solidifying construction for the lane base plate is finished. The bolting and grouting process disclosed by the invention has the advantages that the simplicity and easiness for construction are realized; the links of sealing holes and constructing terrace are omitted; the construction procedures are simplified; the grouting efficiency is increased; and the favorable effect of controlling the floor heave is obtained.

Description

technical field [0001] The invention belongs to the treatment of the bottom of coal mine roadway or other tunnel bottoms, and in particular relates to an anchor injection process for the treatment of the bottom of roadways. Background technique [0002] In recent years, with the increasing depth of coal underground mining, the engineering problems of large deformation and difficult support of soft rock roadways have become more and more serious. Under high ground pressure conditions, bottoming is one of the main characteristics of large deformation of soft rock roadways; The damage of the bottom plate directly affects the stability of the side and roof of the roadway. In the case that the floor is not supported, about 2 / 3 to 3 / 4 of the approach of the roof and floor of the roadway is caused by the bottom. The bottom causes the section of the roadway to shrink, hinders transportation and personnel walking, hinders ventilation, and the bottom is serious It can cause the entir...

AI Technical Summary

Problems solved by technology

[0004] CN201010147471.7 discloses a roadway floor grouting reinforcement method, but the effect of controlling the floor is not good

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