Coal-pillar-free self-forming roadway balanced mining design method and system

Abstract

The invention discloses a coal-pillar-free self-forming roadway balanced mining design method and system. The method comprises the following steps of obtaining a rock mass fragmentation and expansion coefficient through a rock mass fragmentation and expansion function equation; based on the rock mass breaking and expanding coefficient, the roof cutting height enabling a stope to achieve breaking and expanding balance is obtained through a stope breaking and expanding control equation; a series of indoor tests are utilized to obtain roof stratum friction coefficients, and the roof cutting angle is obtained when the stope roof caving resistance is minimum through kerf surface friction comparison; and self-forming roadway support balance parameters are obtained, the roof cutting height, the roof cutting angle and the self-forming roadway support balance parameters are verified to obtain balance mining design parameters, and finally a coal-pillar-free self-forming roadway balance mining solution is formed. According to the coal-pillar-free self-forming roadway balanced mining design method and system, the breaking and expanding parameters, the top cutting parameters and the supporting parameters can be accurately calculated, and the accurate coal-pillar-free self-forming roadway balanced mining solution is formed.

Description

technical field [0001] The invention relates to the field of coal mining, in particular to a design method and system for balanced mining of self-formed lanes without coal pillars. Background technique [0002] Coal mining methods have undergone continuous changes, from the traditional coal pillar digging along the gob to the current self-contained roadway without coal pillars. The mining method of self-forming roadway without coal pillars is to use pre-splitting roof cutting to cut off the stress transfer between the goaf and the roadway, and to use the work of the cut rock mass and the characteristics of the rock mass to automatically fill the goaf to form a gravel roadway. This process cancels the roadway coal pillars and cancels the roadway excavation at the same time. However, there is no clear basis and method for the design of some parameters of this method. Specifically in: [0003] (1) The basis for the design of stope balance parameters is insufficient, includin...

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Problems solved by technology

[0004] (2) The design of roadway balance parameters (row spacing between supports, prestress that can be applied, etc.) is limited to the traditional suspension theory, which cannot scientifically and effectively compensate for the stress loss of the roadway free surface

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