Recovery roadway supporting method based on determination of rise of caving arch

Abstract

The invention discloses a recovery roadway supporting method based on determination of the rise of a caving arch. The method comprises the following steps: (1), excavating a roadway; (2), determining the basic mechanical parameters of surrounding rock and side pressure coefficient of rock masses at two sides of the roadway; (3), determining the rise of limit caving arches, namely determining the rise b2 of the first limit caving arch and the rise b3 of the second limit caving arch according to the determined side pressure coefficient lambda in combination with the basic mechanical parameters of surrounding rock; (4), determining a roadway supporting scheme, namely respectively determining a roadway top plate shallow supporting structure and a roadway top plate deep supporting structure according to b2 and b3; (5), supporting the surrounding rock of the roadway; (6), excavating the next section of roadway, and supporting the surrounding rock of the roadway; and (7), repeating the step (6) for many times till the rectangular roadway is completely excavated and the surrounding rock of the roadway is supported. The recovery roadway supporting method based on determination of the rise of the caving arch, which is disclosed by the invention, is simple in step, convenient to realize, good in use effect and low in construction cost; the top plate of the rectangular roadway can be effectively reinforced; repairing operation of the rectangular roadway is avoided.

Description

technical field [0001] The invention belongs to the technical field of roadway support, and in particular relates to a mining roadway support method determined based on caving arch height. Background technique [0002] Engineering practice shows that after the excavation of the rectangular roadway, the roof rock mass collapses due to the cutting of joints. When the collapse reaches a certain level, the upper rock mass forms a natural balance arch and stabilizes. Since the support parameters of the natural balanced arch are closely related to its shape and sag height, scientifically determining its shape and sag height can rationally design support parameters, save support materials to the greatest extent, and achieve the expected roof support effect. Therefore, it has extremely important theoretical and engineering practical significance to study the shape and sagittal height of the natural balance arch. [0003] The basic assumptions of Platts’s caving arch theory are as f...

AI Technical Summary

Problems solved by technology

At this time, the roof caving arch is mostly in the shape of a flat ellipse or a vertical ellipse, rather than a single parabolic shape, and the roadway roof is prone to fracture and caving, so it is not reasonable to determine the mine roadway support parameters based on Platts caving arch theory

[0008] Second, the simplification of the form of the two gangs is not appropriate, and the form of the gang has a great influence on the height of the arch:

[0011] Third, when the two sides are stable, the shape of the roof caving arch is simplified too simple:

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