Analysis and Calculation on Roof Separation Critical Value of the Gob Roadway Supported with Bolts

摘要

According to the structure and the mechanic property of surrounding rock, the gob roadway can be considered as a special roadway in comparison with the solid-coal roadway. As for the coal mining roadway with bolt support, it's the most dangerous that the roof usually falls down because roof bedding separation value is too large. In order to calculate the critical value of roof bedding separation, the surrounding rock structure and mechanic property of the gob roadway are analyzed, moreover, the mechanical models of the gob roadway are built. Based on analyzing the mechanical property of the gob roadway supported with bolts, the mathematical representations of roof bedding separation critical value are got. Finally, a calculation example is showed, and the results indicate that the roof separation critical calculation value of gob roadway coincides with the monitoring value. The representations of roof bedding separation can be used to predict the critical value in the period of driving and mining, which will protect the workers' security and lives.