Method for controlling surrounding rock of roof-cutting self-forming roadway

Abstract

The invention provides a method for controlling surrounding rock of a roof-cutting self-forming roadway, and relates to the field of coal mining roadway safety. The method comprises the following steps of: quantifying supporting force and load force of a roadway roof-cutting area through technical means such as theoretical analysis, numerical test, indoor test and field monitoring, and establishing a supporting-load balance relationship; determining supporting parameters of anchoring and hydraulic supports according to the supporting-load balance relationship by taking anchoring supporting force and hydraulic support supporting force as controllable supporting force; and arranging the anchoring and hydraulic supports according to the structure of the roof-cutting area to control deformation of the roadway roof-cutting area, establishing a balance relationship between the supporting and load of the roof-cutting area, quantifying the effect of collapsed, crushed and expanded rock on a cutting seam surface and substituting the effect into the balance relationship, accurately obtaining the supporting parameters of the controllable supporting force, guiding the engineering field supporting structure and supporting process design, ensuring long-term safety and stability of the roadway and reducing the supporting cost.

Description

technical field [0001] The invention relates to the safety field of coal mining roadway, in particular to a method for controlling the surrounding rock of a self-formed roadway with a top cut. Background technique [0002] The longwall coal mining method is currently a commonly used coal mining method. It needs to excavate two roadways and set up a section of coal pillars in one working face, which is easy to form a stress concentration area and difficult to control. Moreover, the coal pillars are difficult to control after mining in the working face. It cannot be recycled, resulting in a waste of coal resources; at present, this problem is solved by the self-forming roadway mining technology without coal pillars. The crack surface collapses to form a gravel roadway, which serves the next working face, changing the traditional longwall mining mode of double roadways on one side. [0003] Among them, the self-forming roadway technology without coal pillars by roof cutting an...

AI Technical Summary

Problems solved by technology

Traditional roadway support parameters are mostly conservatively designed. Although the dilated rock mass exerts a certain force on the structural plane of the slit, the effect of the dilated rock mass on the support process is not clear. Substituting or not considering conservative values, resulting in excessive overall support, complicated support work and high support costs

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