doi:10.16186/j.cnki.1673-9787.2019110014

Received:2019/11/05

Revised:2020/06/09

Published:2021/09/15

Water inrush risk assessment of No.15 coal floor after CBM development in Chengzhuang coal mine

LIJianlin 1,2, ZHAO Shuaipeng1, CUIYanhua 3

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.Guangxi Datengxia Water Control Project Development Co.， Ltd. ， Nanning  530000 ， Guangxi， China

Abstract:The study on water inrush risk assessment of coal floor after coal bed methane（CBM） development is very important in theoretical and practical studies for safe coal mining. From two aspects of rock mechanics and geomechanics ， theoretical analysis of water inrush from coal floor after CBM development was conducted. The Ordovician aquifer of No.15 coal seam of Chengzhuang coal mine was taken as an example to establish the in-rush risk assessment model. The results showed that after CBM development ， if the coal seam floor is connicted with the Ordovician aquifer ， the main controlling factors of water inrush from coal floor were in descending order of weight as minimum principal stress of floor ， water pressure of aquifer in floor ， effective thickness of aquifer ， and geological structure ； If the coal seam floor and the Ordovician aquifer were not connected ， the factors of water inrush from coal seam floor were as ； the water pressure of the bottom aquifer ， the effective thickness of the aquifer ， the richness of the aquifer ， the geological structure ， the rock fracture pressure ， and the minimum principal stress of the bottom plate ；The weight of the main control factors were determined by AHP. The fractal-vulnerability index method to was used conduct water inrush risk zoning. The western part of the study area was more vulnerable ， with the north-central part being the transition area and the southeast part of the mining area being the safe area. This method has reference value for water inrush risk assessment of coal floor after CBM development.

Key words:floor water inrush;risk assessment;fractal-vulnerability index method;Chengzhuang coal mine;CBM development

 煤层气开采后成庄矿15号煤层底板突水危险性评价_李建林.pdf