地质异常带巷道稳定控制对策及效果研究

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Abstract Based on the engineering geological conditions in geological anomaly zone，outburst hazard of coal uncovering in rock cross-cut is evaluated and prevented further；and it is confirmed that the coal seam 11–2 has no outburst danger. Combining the grouting in super deep hole and pipe embedded in the drilling，a new advanced supporting technique is proposed；and its action mechanism and supporting technology are analyzed and introduced respectively. Excavation practice has shown that the new advanced support means are feasible to provide an ideal construction circumstances for excavation and subsequent support. After the preliminary support，the deformation monitoring and analysis of roadway show that at the same monitoring section，the deformation of floor heave is more serious than that of two sides and roof；and at different monitoring sections，the deformation of roadway becomes more significant with the increasing of crushing degree of roadway surrounding rock. Cause analysis of the deformation and damage of roadway shows that except engineering geological conditions and in-situ stress of surrounding rock have a significant effect on roadway deformation，another key factor depends on the construction control condition of roadway. Floor short supporting is essential inducement to cause floor heaving seriously，and then instability and failure of whole section ultimately. Then，a new supporting technique combined prestressed multiple anchor cable and bolt-grouting for control of floor heave is proposed；and its reinforcement mechanism and construction technology are analyzed and introduced respectively. Contrast analysis of monitoring results before and after control of floor heave on surface displacement and deep displacement have shown that effect of the new technique is significant for control of roadway floor heave；and rates of surface deformation and deep deformation of roadway significantly decrease，so that the overall stability of surrounding rock of roadway is basically controlled.

Key words： mining engineering fault fracture zone gas outburst hazard advanced support stepped combined support control of floor heave effect analysis

Received: 17 May 2011

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/I12/2486

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