里必井田承压水带压开采评估

Evaluation research of coal mining under pressure in Libi minefield

煤层底板承压水突出是发生水害事故的原因之一,要减少该类事故的发生,需对底板突水危险性进行准确评价。为保障里必井田承压水带压开采的安全进行,基于煤层底板突水研究理论分析,采用常规突水系数法和等效厚度突水系数法,分别对里必井田内3#煤和15#煤的奥灰水突水危险性进行了研究。研究发现,奥灰水对于3#煤的开采影响不大,但在局部构造及陷落柱发育地段及采区东北部区域仍存在一定的突水可能性;奥灰水对15#煤开采具有较大威胁,大部分区域具有较大突水危险性。等效岩层厚度法计算的突水系数考虑了不同性质岩层的岩石强度和阻水能力,计算更接近生产实际,结果更可靠;且在对突水系数法进一步优化后,其评价的结果可以更精确。

The outburst of confined water in coal seam floor is one of the water damage accidents.In order to reduce the occurrence of such accidents,it is necessary to accurately evaluate the risk of water inrush from the floor.In order to ensure the safety of mining under pressure of confined water in Libi minefield,the risk of water inrush from Ordovician limestone in the mining of No.3 coal seam and No.15 coal seam in Libi minefield was studied by using conventional water inrush coefficient method and equivalent thickness water inrush coefficient method respectively.The results show that the effect of Ordovician limestone water on the mining of No.3 coal seam is not significant,but there is still a certain possibility of water inrush in the local area where the structure and collapse column is developed,as well as in the northeast of the mining area.The Ordovician limestone water has a great threat to the No.15 coal seam,and most of the areas have a great risk of water inrush.The water inrush coefficient calculated by equivalent rock thickness method considers the rock strength and water resistance capacity of different rock layers.After further optimization of water inrush coefficient method,the water inrush evaluation result can be more accurate and closer to the production practice.