Study on Rock Core Discing Mechanism Based on Stress and Energy Principle

摘要

To study the mechanism of rock core discing phenomenon in coal mine,the stress and energy conditions of the occurrence of rock core discing phenomenon are analyzed from stress' and energy's points of view,together with the engineering practice of rock core discing in Zhaogezhuang coal mine of Kailuan mining area,and in-situ stress measured data of 4103 crosscut where rock core discing occurred.The results show that when the tensile stress generated by the relieved part of rock core is larger than its tensile strength,rock core discing phenomenon will occur according to the stress relieving method.From the perspective of energy,rock core discing is generated by the cyclic release of energy,which is accumulated in rock core.The research results will provide theoretical evidence to high-stress forecast of Zhaogezhuang coal mine,and provide an effective alarm to the potential occurrence of geological dynamic disasters in Zhaogezhuang coal mine at the same time.