Research on Deformation Characteristics and Control Measures of Roadway Surrounding Rock Based on the Technology of Retaining Roadway Along Goaf
In response to the problems of strong strata behavior,prominent deformation of surrounding rock and so on in the roadway of Runhong Coal Industry,a systematic analysis is conducted on the influence of hydraulic fracturing cracks on surrounding rock deformation.Key roof cutting parameters are selected,based on numerical simulation and on-site experiments,the roof cutting and pressure relief and surrounding rock control of the 1311 working face retaining roadway along goaf are studied.The results indicate that the strong strata behavior of the roadway along goaf is mainly due to the presence of high stress zones near the roadway surrounding rock;During the hydraulic fracturing process of the roadway surrounding rock,when the main crack of the surrounding rock encounters a 90° precracking,it will deflect and expand in an approximately bidirectional symmetrical manner.However,when encountering a 45° precracking,it will expand in a unidirectional asymmetrical manner;different roof cutting parameters are conducted to be simulated through 3DEC,the precise fracturing position is determined between the mine pillar and the goaf,with an angle of 70° and a height of 2/3 of the basic top height.A support technology centered on"reinforced anchor rods(cables)+powerful W belt"is proposed,the deformation amount of the roadway roof,floor,and two sides are relatively small,achieving stable control of the roadway in the experimental section.
retaining roadway along goafdeformationhydraulic fracturingsupport
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