Progressive shielding booster-type grouting and reinforcing technology for baseboard

Abstract

The invention relates to a progressive shielding booster-type grouting and reinforcing technology for a baseboard, aiming at the problems of weak and muddy roadway baseboard drilling construction and bottom heave control. The baseboard grouting depth is successively increased from a shallow part, a middle deep part and a deep part; shallow part grouting forms a shielding grout stopping layer to protect middle deep part grouting; the middle deep part grouting forms a shielding grout stopping layer to protect deep part grouting; after grouting, the integrity of a country rock within the grouting range is improved; and the problem of hole collapse for drilling in the subsequent grouting can be solved so as to realize the purposes of continuously increasing the grouting depth and the groutingpressure of a roadway baseboard. With the method, the geologic anomaly zone and the weak and muddy roadway baseboard can be effectively reinforced, the bottom heave speed is lowered, and the roadway bottom heave is controlled.

Description

technical field [0001] The invention relates to the treatment and reinforcement technology of the bottom plate of coal mine roadway, in particular to a progressively shielding pressurized grouting reinforcement technology for the bottom plate. Background technique [0002] The roadway floor heave problem is common in coal mine roadways. At present, domestic and foreign methods and technologies to control the floor heave or reduce the volume of the floor heave include pressure relief to improve the stress state of the surrounding rock of the floor and reinforcement to improve the strength of the surrounding rock of the floor. Protection method, full-section support method such as concrete slabs and arc slabs, construction floor anchor method, floor grouting method, bottom slab vertical groove prevention method, bottom slab excavation roadway pressure relief method on both sides of the floor, loosening the two bottom corners of the floor roadway The blasting method and the me...

AI Technical Summary

Problems solved by technology

However, when the content of clay minerals such as kaolinite, montmorillonite, illite, and illite in the surrounding rock of the roadway is relatively high, and the mudstone on the floor is severely muddy after contact with water, or the roadway is in a geological anomaly zone, weak and broken, The bottom plate is broken, and the quality of drilling holes in the bottom plate is poor. After the drill pipe is withdrawn, only the shallow part of the roadway bottom plate is drilled with good quality, and the deep hole will collapse. Bottom bolts and grouting pipes can only be used to construct and reinforce the roadway Bolts and grouting pipes in the shallow part of the floor and deep in the floor cannot be constructed, so the surrounding rock in the deep part of the floor will not be reinforced, and the bottom heaving of the roadway is still serious, and the floor cannot be effectively controlled

For these problems, there are no effective solutions at home and abroad.

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