首页|Mechanism and control technology of strong ground pressure behaviour induced by high-position hard roofs in extra-thick coal seam mining

Mechanism and control technology of strong ground pressure behaviour induced by high-position hard roofs in extra-thick coal seam mining

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This work aimed at revealing the mechanism of strong ground pressure behaviour(SGPB)induced by high-position hard roof(HHR).Based on the supporting structures model of HHR,a modified voussoir beam mechanical model for HHR was established by considering the gangue support coefficient,through which the modified expressions of limit breaking span and breaking energy of HHR were deduced.Combined with the relationship between the dynamic-static loading stress of supporting body(hydraulic support and coal wall)and its comprehensive supporting strength,the criteria of ground pressure beha-viour(GPB)induced by HHR were discussed.The types of Ⅰ1,Ⅰ2,Ⅱ1,and Ⅱ2 of GPB were interpreted.Results showed that types Ⅰ1 and Ⅰ2 were the main forms of SGPB in extra-thick coal seam mining.The main manifestation of SGPB was static stress,which was mainly derived from the instability of HHR rather than fracture.Accordingly,an innovative control technology was proposed,which can weaken sta-tic load by vertical-well separated fracturing HHR.The research results have been successfully applied to the 8101 working face in Tashan coal mine,Shanxi Province,China.The results of a digital borehole cam-era observation and stress monitoring proved the rationality of the GPB criteria.The control technology was successful,paving the way for new possibilities to HHR control for safety mining.

Extra thick coal seamHigh-position hard roofStrong ground pressure behaviourSupporting structuresCriteria of ground pressure behaviourControlling effects

Chao Pan、Binwei Xia、Yujun Zuo、Bin Yu、Changnan Ou

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Mining College,Guizhou University,Guiyang 550025,China

National&Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam,Chongqing University,Chongqing 400044,China

State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China

国家自然科学基金Shanxi Province Science and Technology Plan Exposed Bidding ProjectOpen Project Program of Key Laboratory of Mine Disaster Prevention and ControlSci-entific Research Project of Introducing Talents in Guizhou Univer-sityOpen Project Program of National Engineering Technology Research Center of Development and Utilization for Phosphorus ResourGrowth Project of Young Scientific and Technological Talents in Universi-ties of Guizhou Province

5197404220191101015JMDPC202102202045NECP202210KY2022139

2022

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCDSCIEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2022.32(3)
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