A control method for roadway roof deformation under high level stress

Abstract

The invention discloses a control method for high-level stress effect roadway top plate deformation. The method comprises the following steps that (1) reasonable roadway width and height are determined; (2) a set of look-head pressure relief drill holes obliquely facing upward are drilled in the two sides of a roadway top plate at the surrounding rock portions of the shoulder angles on the upper portions of the two sides of a roadway; (3) high-strength high pretightening force cooperative support control is conducted on 'the roadway top plate, the roadway two sides and the shoulder angle surrounding rock'; (4) grouting holes are drilled in the surrounding rock of the shoulder angles on the two sides of the roadway top plate for grouting reinforcement. According to the control method, high-level stress on the two sides of the roadway of the top plate can be unloaded, the high-level stress is transferred to the deep portion of the roadway top plate, and compensating space is provided fordeformation of the surrounding rock of the shoulder angle of the roadway; the integral capacity of deformation resistance of the surrounding rock of the roadway can be significantly improved, and itis effectively avoided that due to the fact that an existing support mode attends to one thing and loses another, local buckling and buckling of a full cross-section are caused; the bearing capacity of the surrounding rock of the shoulder angle is enhanced, the capacity of deformation resistance of the surrounding rock is improved, and finally the stability of the roadway top plate under the effect of high-level stress is ensured.

Description

technical field [0001] The invention belongs to the technical field of roadway roof deformation control, and in particular relates to a method for controlling deformation of roadway roof under high-level stress. Background technique [0002] The stratum stress of coal mines is often dominated by horizontal stress. As coal mining goes deeper, the horizontal stress becomes more prominent. In structural areas such as faults and folds, the horizontal stress reaches 2 to 4 times the vertical stress. After the excavation of the roadway, under the action of high horizontal stress on both sides of the roof, the roof will be subjected to horizontal extrusion, causing serious subsidence, layer separation and deformation damage. If the control is unreasonable, roof caving accidents will occur. Equipment and safe production pose a serious threat. At present, for the roadway roof control under the action of high horizontal stress, the surrounding rock control idea of ​​increasing the su...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems existing in the prior art, the present invention provides a method for controlling the deformation of the roof of the roadway under high-level stress, aiming at the coordinated support control of the roadway roof, the two sides of the roadway and the surrounding rock at the shoulder angle through the horizontal stress relief of the roadway roof and the coordinated support of the roadway roof. The technology can effectively solve the technical problems existing in the existing technology such as "high horizontal stress of the roadway roof, serious deformation of the roadway roof and surrounding rock at the shoulder angle, and difficulty in controlling the deformation of the roadway roof with local strengthening support", thereby effectively improving the deformation control effect of the roadway roof

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