巨厚冲积层薄基岩综放开采覆岩移动规律

doi:10.11799/ce201410042

Abstract

Abstract:

Top-coal caving face always suffered abnormal roof weighting under the condition of ultra-thick alluvium and thin bedrock, which is a great challenge for roof control. Numerical calculation was employed to analyze the roof failures under the different condition with 600-m-thick alluvium and different bedrock thicknesses. The results show that all the overburden may shear off if the bedrock thickness is less than 120 m; the thick alluvium is a whole structure in deformation but difficult to form a stable bearing structure. The filed investigation presented the abnormal roof weighting and proved the relation between the thick alluvium and the thin bedrock. The achieves provide a reference for mining safety under similar conditions.

Key words: Top coal caving, ultra-thick alluvium, deep coal seam, thin bedrock, support resistance

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URL: http://www.coale.com.cn/EN/10.11799/ce201410042

http://www.coale.com.cn/EN/Y2014/V46/I10/146

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Overburden movement response top-coal caving under ultra-thick alluvium and thin bedrock

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