›› 2006, Vol. 27 ›› Issue (S1): 266-269.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study on mechanism of abnormal pressure on support in fully mechanized sublevel caving face at geologic changing

SHI Hong1,2,3，JIANG Fu-xing2，LI Lian-xiang4   

  1. 1. Department of Civil Engineering, Shandong Jiaotong University, Jinan 250023, China; 2. Beijing University of Science & Technology, Beijing 100083,China；3 College of Hydraulic and Civil Engineering, Shandong Agricultural University, Tai’an 271018, China; 4. Shandong University of Science and Technology, Tai’an 271019, China
  • Received:2006-04-21 Published:2006-12-15

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Abstract: Aimed at phenomena of support’s being pressed to burst or be unable to work in a few fully mechanized sublevel caving longwall faces, according to the analysis of the roof structures, their movement characteristics and the dynamic stability in fully-mechanized sublevel caving face, the mechanism of abnormal pressure on support in fully mechanized sublevel caving face is studied. The conclusion is that the main cause of abnormal pressure is sliding of roof structure. Because of the difference of sliding of roof structure, there are three of abnormal pressure. According to the analysis of the pressure on support, the computation formulae of abnormal pressure on support are presented. Using the dynamic stability judgement rules of roof structures, the types of abnormal pressure on support are distinguished and the computation means of abnormal pressure are defined; and the theoretical foundation about the selection of support in fully mechanized sublevel caving face and controlling abnormal pressure at field experiments are provided.

Key words: fully mechanized sublevel caving face, top coal’s recovery ratio, dynamic stability, sliding of roof structure, abnormal pressure

CLC Number: 

  • TD 35
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