Deep soft coal rock stability early judgment method

Abstract

The invention discloses a deep soft coal rock stability early judgment method. The method comprises the steps that soft coal rock roadway surface deformation of key parts of different time points is measured every two days, and different surface deformation speeds are analyzed; an evaluation roadway surface deformation speed retarding degree index is determined and a critical allowable value is quantitatively determined; and the actual measurement value and the critical allowable value of the roadway surface deformation speed reduction degree index are compared and evaluated, and the stabilityof the soft coal rock is judged in time in the early stage. The invention relates to the technical field of roadway surrounding rock instability judgment. According to the deep soft coal rock stability early judgment method, the problems that in the existing roadway coal rock stability judgment process, deviation exists in roadway coal rock deformation, passive repair is needed in the later period, the roadway tunneling speed is reduced, the supporting cost is increased, and potential safety hazards are improved are solved.

Description

technical field [0001] The invention relates to the field of roadway surrounding rock instability identification technology, in particular to an early identification method for the stability of deep weak coal rocks. Background technique [0002] Deformation and instability of surrounding rocks in deep soft rock coal rock roadways are widespread, but the "instability" of surrounding rock deformation has a time process. Generally, the "instability" of surrounding rock deformation needs to go through a rapid deceleration stage, a slow deceleration stage, and an acceleration stage before deformation occurs. Unsteady. It usually takes more than 150 days to 180 days from the excavation of the roadway to the obvious deformation and instability of the deep soft coal rock, sometimes longer or even more than one year. At present, the surface deformation of the roadway is generally measured by the wire drawing method in engineering and compared with the determined critical allowable va...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides an early identification method for the stability of deep weak coal rocks, which solves the problem of deviations in the deformation of the coal rocks in the existing roadways during the identification process of the coal rock stability in the existing roadways, which causes passive repairs in the later stage. Reduce the speed of roadway excavation, increase support costs, and increase safety hazards

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