| Based on the mining effect problems of fully-mechanized sublevel caving faceroadways in Guobei Coal Mine with soft thick and mixing muck coal seams, usinglaboratory experiment, field measurement, numerical simulation and appliedexperiment methods the showing laws and around rock deformation control ways ofworking field roadways under the mining pressures are studied in this doctoraldissertation. Through mining pressure measurements within roof rock seams of fieldroadways the mining pressure sizes and showing laws of fully-mechanized sublevelcaving face and roadway are obtained. The lateral pressure coefficient of soft coalseams and the showing degrees as well as influence ranges of mining pressures infield roadways are measured in coal sample tests and field around rock convergencemonitors. The effect relations of coal seam inclinations to roadway side level pressureasymmetry and the control deformation effects of around rock under the differentsupporting conditions are received from simulation calculating analysis. Thecombined supporting proposals of U type steel frame with coal seam bolts togethershort beams, which are fitted for mining face roadways, are designed throughresearching mechanism. The field application experiments and deformation monitorsshow that the designed supporting methods can be suitable for controlling around rockdeformations under mining influence in Guobei Coal Mine. |
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