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Study On Mining-Induced Slope Activity Mechanism And Its Control Of Shallow Coal Seam In Gully-Growth-Wide Mining Area

Posted on:2010-09-17Degree:DoctorType:Dissertation
Country:ChinaCandidate:X F WangFull Text:PDF
GTID:1101360278461442Subject:Mining engineering
Abstract/Summary:PDF Full Text Request
Crossing geomorphologic characterization of gully causes that interaction of fluctuating surface and shallow coal seam mining is more sensitive and intense in China northwest mining area, especially, kinds of gully-slope in surface, causes strata-pressure behavior to occur new characters in underground coalface, and has the adverse effect to coalmines safe highly effective production. Taking two kinds of typical mining-induced slopes of bedrock and sand-soil to as research objects and coalface back-gully advancing to as main mining method in this paper, mining-induced slope activity mechanism and its control of shallow coal seam in gully-wide-growth mining field have been systematically analyzed by laboratory physical simulation, numerical simulation, theoretical analysis and field observation methods etc, and which could guide engineering practice initially. Innovative achievements of this dissertation have been displayed as follows:(1)Different mining-induced slope activity way deriving from different advancing direction of coaface has been revealed and proved first time. Down-slope sliding occurs for toward-gully mining, while reverse-slope rotating for back-gully mining, but the slope activity mechanism deriving from bedrock-gully and sand-soil-gully is different.(2)Multilateral block hinged structure of bedrock-gully mining-induced slope has been proposed for the first time, influence characteristics of different slope angle to the structure has been analyzed, and corresponding mechanical model of stability analysis has been founded; angle of gully is the bigger and thickness of bedrock is smaller, the structure is much easier to sliding instability, and supporting resistance of controlling multilateral block sliding instability has been calculated out.(3)The main roof first breakage asymmetry of shallow coal seam under sand-soil-gully slope has been proposed first time, corresponding structure mechanical model of main roof first weighting and periodic weighting has been founded, and the relation between structure stability and"support-surrounding rock"has been analyzed, supporting resistance of controlling roof structure sliding instability has been calculated out.(4)The coalface supporting resistance calculation validity under two kinds of typical gully-slope has been validated by actual measure results, which shows that the coalface supporting resistance occurs reducing tendency for back-gully mining and the key point of roof controlling is below segment of mining-induced slope.(5)Based on mass actual mesure and numerical calculation results analysis, the gully-slope cutting-coefficient concept has been proposed for the first time, according to two index of cutting-coefficient and slope angle, mining insenstivity classification has been done on gully-slope, which might guide coalmines safe highly effective production116 pieces of figures, 26 pieces of tables and 152 pieces of consult documents (38 pieces of foreign literatures inside)have been quoted in this dissertation.
Keywords/Search Tags:gully development, shallow coal seam, mining-induced slope, multilateral blocks, sensitivity classification
PDF Full Text Request
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