Determination And Application Of Critical Value Of Rock Failure Angle

Rock mechanics,especially rock failure,has a great influence on the stable operation of large water conservancy projects,and is closely related to the water damage caused by groundwater pumping and mine mining.At present,there have been many researches and applications of using Angle sensors to monitor engineering rock mass instability and deformation,and the results are relatively rich.However,the critical value of Angle during deformation and failure has not been involved so far.In the laboratory test of this paper,the specimens made by artificial rock-like materials and natural rocks are taken as the research objects,and the numerical simulation of FLAC software and the simulation of similar materials are compared and verified and analyzed.The critical values of rock failure Angle of different lithologies are obtained by the comprehensive analysis of the three methods.The critical value of rock failure Angle is related to particle size and cementation mode,but has nothing to do with thickness and cross section area.The conclusion of the control variable test is verified by the numerical simulation of the laboratory test,the numerical simulation of the actual mining face and the material simulation.In different lithology corner,on the basis of the critical value,through the design and arrangement of 61601 working face field monitoring scheme,according to the damage threshold of mudstone got the floor with a depth of 16 m,at the same time,the network parallel electrical method of monitoring the bottom damage with a depth of15 m,verified the accuracy of Angle monitoring results and methods of reliability,safe operation of the project in the future have important significance and application value.There are 43 figures,29 tables and 92 references in this paper.