Research on comprehensive treatment technology of surrounding rocks along gob-side entry retaining under special geological conditions
In order to ensure the effectiveness of retaining and reusing tunnels under the special geological conditions of roof fragmentation,taking the 31117 working face of Jinjie Coal Mine as the research background,a structural model of the overlying rock layer was established to confirm a support concept that combines strengthening support,increasing support density,and multiple support methods.During the retention period,measures such as reinforcing support and widening the width of concrete walls were taken to ensure the stability of the retained roadway.During the reuse period,measures such as adding hydraulic supports and reinforcing the roof of the roadway were taken to ensure the normal mining of the working face.The mining pressure results indicated that the increasing of support strength can effectively ensure the formation effect of the concrete wall during the retention period,and the mining pressure was not obvious.During the reuse period,the mining pressure was more severe,and the deformation of the concrete wall changed significantly compared with normal areas.The subsidence of the roof increased to 850 mm.By adopting various support forms,the normal mining of the working face was ultimately ensured.
gob-side entry retainingleft lane stagereuse stagemine pressure observation
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