Study On Source Mechanism Of Engineering Rock Masses Failure And Application

The study of the Source Mechanism is a hot and difficult issue in seismic research.It is a hot spot to combine theory with practice and solve practical engineering problems by applying it to the study of the Source Mechanism solution of engineering rock mass failure process in civil engineering.In view of the Source Mechanism of engineering rock mass failure,the theory,source models,solution methods and application of the Source Mechanism are studied.In view of the theoretical and source models of the Source Mechanism,three models are compared and analyzed.The radiation patterns of P-wave and S-wave in the far field are extracted and the correlation between the parameters of the radiation patterns are analyzed.The P-Wave First Motion Method,P-wave to S-wave amplitude ratio method and S-wave Polarization Method are studied,The advantages,disadvantages and applicability of each solution methods are discussed.The moment tensor theory is studied,the moment tensor decomposition methods are discussed and the Source Mechanism beach ball method and Hudson source type plot method are used to describe moment tensor.Based on the principle of microseismic monitoring,the case of large mountain slip failure caused by the aftershock of artificial blasting in the 630 mining area of Shizhuyuan Polymetallic Mine in June 21,2012 was analyzed,and the microseismic location events were analyzed.39 events were extracted to retrieve the Source Mechanism solution of the rock mass failure,and the types of failure are discriminated and divided.Through the research of this paper,it is concluded that the double-coupled model is a more reasonable hypothesis of the source models.Through the study of the solution method of the Source Mechanism,it is believed that the principle of the P-Wave First Motion Method is clear,the amplitude ratio method and t S-wave Polarization Method for the determination of the nodal plane is more effective,but the difficulty lies in the accurate identification of the information of the S-wave and the determination of the amplitude;The method of moment tensor is obtained,and then the method of inversion of the Source Mechanism by the moment tensor is given,and the Source Mechanism beach ball method and Hudson source type method are analyzed,and the calculation of T-k parameters are used to make the expression of the moment tensor of the Source Mechanism.Based on the case analysis of the catastrophic mountain slip,the three components of the moment tensor solution of the microseismic positioning event are obtained,the calculated parameters of the pure double-couple component MDC are used to find the parameters of the fault at the source,and the Source Mechanism beach ball diagram is plotted to break the source,according to calculated value R and the waveform analysis of the location event,it is concluded that the type of the slip failure caused by this aftershock has a large probability of shear failure.By further parametric T-k analysis,it is also concluded that the type of slip failure caused by this aftershock is the probability of shear failure.In summary,the comprehensive application of the Source Mechanism solution theory can judge the type of the engineering rock mass failure,judge the fault parameters of the source,and express it by intuitionistic graphics,as a result,a reasonable and accurate judgment is maded on the types of engineering rock mass failure.