Bottom plate pressure relief and reinforcement structure for controlling floor heave of deep roadway and construction method of bottom plate pressure relief and reinforcement structure

Abstract

The invention discloses a bottom plate pressure relief and reinforcement structure for controlling a floor heave of a deep roadway and a construction method of the bottom plate pressure relief and reinforcement structure. The construction method comprises the following steps: (1) excavation of a roadway and anchor mesh supporting: excavating the deep roadway, and performing the anchor mesh supporting on a surrounding rock after the surrounding rock is formed; and (2) digging of two pressure relief troughs: respectively digging a long-strip-type pressure relief trough in each of the left and right sides of a bottom plate of the roadway through an air pick along the axial direction of the roadway, wherein the cross section of each pressure relief trough is rectangular, and the pressure relief troughs take a boundary line of one side end as a symmetric line. In conclusion, a bottom plate pressure relief method is used for controlling the problems of the floor heave of the deep roadway and deformation of the surrounding rock; and on the basis of a deep roadway anchor and injection supporting technology at the present, the pressure relief effect on the surrounding rocks on the bottom plate, two ends and a top plate is improved by reasonably determining the shape, the size and the arrangement position of each pressure relief trough, the number of secondary interstices in the surrounding rocks is increased, the grouting effect on the surrounding rocks is enhanced, the problem of the floor heave of the deep roadway can be effectively controlled, and long-term stability of the surrounding rock of the deep roadway is guaranteed.

Description

technical field [0001] The invention belongs to the field of roadway support, and in particular relates to a floor pressure relief reinforcement structure for controlling deep roadway bottom sag and a construction method thereof. Background technique [0002] Due to the impact of roadway excavation or coal seam mining, the stress field of the original rock is destroyed, causing the stress redistribution of the surrounding rock of the roadway. When the concentrated stress of the surrounding rock exceeds the strength of the surrounding rock, the surrounding rock undergoes plastic deformation, which is mainly manifested as the roof and floor of the roadway and the surrounding walls of the two sides. The rock moves to the roadway space, and the movement of the surrounding rock of the roadway floor to the roadway becomes the bottom rock. Under normal circumstances, the floor of the roadway is in a state of no support or no closure. The support strength of the floor of the roadway...

AI Technical Summary

Problems solved by technology

Under normal circumstances, the floor of the roadway is in a state of no support or no closure. The support strength of the floor of the roadway is lower than that of the two sides and the roof of the roadway. The deformation and damage of the roadway first starts from the bottom of the roadway, that is, the bottom of the roadway. After that, the two sides of the roadway converge, resulting in The roadway support is completely ineffective. Therefore, the bottom of the deep mining roadway (cavement) has always been the main factor that affects the stability of the surrounding rock of the roadway (cavement) and increases the difficulty of roadway support. The nearness is more than 80%. The bottom of the roadway not only increases the distance between the roof and the floor, but also reduces the section size of the roadway, which affects the normal transportation, ventilation and pedestrians of the roadway.

The roadway with serious bottom slack causes the increase of the approach of the two sides of the roadway, the deformation of the surrounding rock of the roadway is in a rheological state, and the surrounding rock is in an unstable state. completely scrapped

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