LI J L, WANG X X, WANG Y, et al.Prediction of coal seam floor damage depth based on vulnerability index method[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(5):1-7.

doi:10.16186/j.cnki.1673-9787.2020030017

Received:2020/03/07

Revised:2020/07/09

Published:2022/09/25

Prediction of coal seam floor damage depth based on vulnerability index method

LI Jianlin1,2, WANG Xiongxiong1, WANG Yan3, CHANG Xiaofeng1

1.Institute of Resources & Environment，Henan Polytechnic University，Jiaozuo  454000，Henan，China;2.Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization，Jiaozuo  454000，Henan，China;3.School of Physics & Electronic Information Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China

Abstract:Aiming at the problem that the current research on the failure depth and law of coal seam floor mainly focuses on the mining face，but there is less research on the whole mining area，AHP was used to establish the vulnerability hierarchy of coal floor.The FLAC3D numerical simulation method and orthogonal test were used to determine the weight of each impact factor.The borehole exploration data of the mining area and the graphic overlay function of GIS were used to establish the vulnerability zone model of coal floor in the mining area，and the model was used to predict the failure depth of coal seam floor in the mining area.Taking No.12 coal mine of Pingdingshan Tian’an Coal Industry Co.，Ltd.as an example，the corresponding relationship between coal seam floor failure depth and vulnerability zoning was established by comparing with the simulated value of floor failure depth of typical working face.The following results were obtained：The 6 factors that affected the floor damage depth in order of weight were working face oblique length，roof lithology combination，mining depth，floor lithology combination，coal thickness and coal seam inclination respectively；When the degree of the coal floor vulnerability increased by 1 level，the depth of damage increased by 5 m；The predicted values of floor damage depth of mining area were from 12.2 m to 31.7 m.The coal seam floor vulnerability index method provided a new method for studying the depth of coal floor damage in the mining area.

Key words:coal seam floor;damage depth;floor vulnerability zone;FLAC3D numerical simulation;orthogonal experiment;mining area

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