煤层巷道蝶型冲击地压发生机理猜想

根据巷道围岩蝶形塑性区理论,分析了巷道围岩蝶形塑性区蝶叶瞬时急剧扩展的突变特征,提出了煤层巷道蝶型冲击地压发生机理猜想,认为煤巷冲击地压是由于巷道围岩蝶形塑性区的蝶叶瞬时爆炸式扩展引起的,阐明了该类型冲击地压形成、演化及发生的力学本质和物理过程。提出了蝶叶突变型冲击地压发生的必要与充分条件,建立了煤层巷道冲击地压判定准则,合理解释了巷道顶板冲击、底板冲击、煤帮冲击等不同类型的冲击地压发生机理。该猜想能够预见巷道冲击地压发生时必然产生至少1个、最多4个巨大的蝶叶塑性区的未知现象,可以获得煤巷冲击地压危险性评价和预测的关键指标和可测参量。

Mechanism conjecture of butterfly rock burst in coal seam roadway

According to theory of butterfly-shaped plastic zone around roadway in host rockmass,the instantaneously extend mutation characteristics of butterfly-shaped plastic zone were analyzed,a mechanism conjecture of butterfly-mutation rockburst in coal seam roadway was then developed.The presented conjecture considered an instantaneously exploration mutation characteristics of butterfly-shaped plastic zone as the main potential cause of roadway rockburst.Further,mechanics essence and physics process of the formation,evolution and occurrence of rockburst were explained.Necessary and sufficient conditions of rockburst were proposed and criterion of roadway rockburst was built.In this fashion,mechanisms of different types of roadway rockburst (roof burst,floor burst,rib burst,etc.) can be explained properly.This “conjecture” had the capacity of predicting the unknown phenomenon,which normally associates with from,at least,1 to 4 huge butterfly-shaped plastic zones inevitably occured under a roadway rockburst.In addtion,this “conjecture” could acquire critical index and measurable parameters for risk assessment and prediction.