煤巷层状顶板岩石钻进动态响应特性数值试验

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Abstract Horizon combination as well as physico-mechanical characteristics severely influence the stability of rock bolting roof in coal roadway，and the drilling device of anchoring holes has different responses to different types of rock，which provides information of thickness and strength on rock. In order to overcome concealment problems of roof in coal roadway，design bolting parameters reasonably and prevent roof falling，numerical experiments about drilling characteristics on roof in coal roadway were carried out. Study shows that the drilling on roof in coal roadway is discontinuous and anchoring holes are deepened step by step like jump. Under the condition of homogeneous rock，the drilling speed from high to low is sandy mudstone，siltstone，mudstone and sandstone，while the resistance of bore bit from large to small is siltstone，sandstone，mudstone and sandy mudstone. Above indices are monitored by related instruments during drilling anchoring holes，which are very significant to distinguish the type and thickness of roof rock within the scope of anchoring holes in coal roadway.

Key words： rock mechanics bolting coal roadway stratified roof rock breaking and drilling drilling dynamic response numerical experiment

Received: 24 May 2013

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/Isl/3170

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