用于煤层底板突水机理研究的岩体原位测试技术

底板突水是底板受采动应力和承压水水压共同作用的结果。开拓和采动打破了原有地应力的平衡状态,为达到新的平衡,某些应力相对集中的地方,会释放应变能,使岩体构造发生变化;而承压水的水压对底板隔水层的作用主要是压裂扩容作用与渗水软化作用。本文介绍了由岩体原位应力测试技术、室内三轴渗透仪测定技术和计算机有限元模拟技术组成的岩体应力测试综合技术及其在煤层底板突水预测中的应用。 

THE TECHNIQUE MEASURING THE STRESS OF ROCK MASS USED IN THE STUDY OF THE MECHANISM OF THE WATER-INRUSH FROM COAL FLOOR

The water inrush from coal floor is led by the actions between mining stress and confined water pressure Because developing and mining upset the balance of crustal stress,some regions of concentrating crustal stress will release the energy of strain to reach new balance,so that the rock mass structure is changed The actions of confined water pressure and coal floor retainer is mainly bath rock mass volume expanding and the rock softening This paper introduces comprehensive technique of measuring rock mass stress,which is composed by the in situ measuring technique of the rock mass stress,measuring technique in trinity axis permeater instrument in laboratory and simulating technique of the finite element;and the applications in the prediction of water inrush from coal floor