Practice of exploration and support technology for goaf area passing through old roadway during excavation of extra thick coal seam
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Abstract
During the excavation of 39102 auxiliary transportation gateway of China Coal Energy Huayu Yuanbaowan Coal Industry Co., Ltd., the old empty area is connected with the old lane of the original No.2 well, which caused potential safety hazards to the safety production of 39102 working face. In order to ensure the safety production of the working face, the old roadway exposed during the excavation of the 39102 auxiliary transportation is supported and treated. Before the management of the goaf, it is necessary to use the methods of geophysical exploration, drilling and combined chemical exploration for the old lane emptying area to determine the distribution range of the old lane emptying area. On this basis, it is necessary to explore the empty area of the old lane to clarify the technical measures when the tunneling roadway crosses the old lane empty area. In the empty section of the 39102 auxiliary transportation roadway through the old lane, the joint support scheme of “frame to shed + grouting + grouting filling” is adopted, which not only improves the efficiency of the auxiliary transportation along the channel, but also effectively controls the instability of surrounding rock during the old space of the small kiln. A joint support scheme of “frame to shed + spray + grouting filling” is proposed to improve the efficiency of the auxiliary transportation along the tunnel excavation and effectively control the instability of the surrounding rock during the small kiln goaf.
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