Failure structure characteristics of strata with <a name="OLE_LINK10">upper thin and lower</a> thick strata in ultra-close coal seams with simultaneous mining and relationship between shield and surrounding rock

Journal of Mining & Safety Engineering ›› 2017, Vol. 34 ›› Issue (5): 832-837.

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Failure structure characteristics of strata with upper thin and lower thick strata in ultra-close coal seams with simultaneous mining and relationship between shield and surrounding rock

Received:2016-05-12 Online:2017-09-15 Published:2017-10-09

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