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    Volume 40, Issue 2 (March 2017)

    In Situ Investigations on Failure Evolution of Overlying Strata Induced by Mining Multiple Coal Seams

    (Received 9 May 2016; accepted 9 November 2016)

    Published Online: 2017

    CODEN: GTJODJ

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    Abstract

    Accurate evaluation of the failure evolution of the overlying strata after multiple mining actions is of great importance both for the prevention of water disasters and the mining designs. To ensure the safety of mining multiple coal seams, the fracture criterions of overlying strata after mining actions were established on the basis of beam theory as well as the influences of coal seam spacing, face size, and lithology on the increased heights of failure zones after each consecutive mining sequence. A newly developed device, named electric controlled water flow detector, and its detecting procedure, was introduced. In situ investigations were performed in the Gaojialiang and Jinhuagong Mines, China. Results showed that the mining of a lower coal seam does not change the failure evolution of the roof strata of the upper coal seam when the coal seam spacing is large. The larger the mining height of the lower coal seam is, the more fractures the overlying strata of the upper coal seam have, and the larger the height of the failure zone. In addition, the failure extent of overlying strata caused by coal face mining increased with their hardness. It was found that the electric controlled water flow detector can effectively detect the failure evolution during multiple mining actions, with high water plugging effectiveness and detection accuracy.


    Author Information:

    Tan, Y. L.
    State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong Univ. of Science and Technology, Qingdao, Shandong

    Liu, X. S.
    State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong Univ. of Science and Technology, Qingdao, Shandong

    Ning, J. G.
    State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong Univ. of Science and Technology, Qingdao, Shandong

    Lu, Y. W.
    State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong Univ. of Science and Technology, Qingdao, Shandong


    Stock #: GTJ20160090

    ISSN:0149-6115

    DOI: 10.1520/GTJ20160090

    Author
    Title In Situ Investigations on Failure Evolution of Overlying Strata Induced by Mining Multiple Coal Seams
    Symposium ,
    Committee D18