The Combined Load Of The Three-dimensional Movement Dynamic Characteristics Of The Rock Of High Stress And Rockburst Research

Many scholars engaging in research on rock mechanics haveinvestigated the performances of rocks experiencing static load anddynamic load(including impact and disturbance loads, the same below),obtained many results, and made great progress on both rock mechanicstheories and applications. In fact, in undergroud space engineering, suchas in deep mining and deep buried tunnels, rock is on the condition ofhigh static stress or ground stress before they are experienced dynamicstress, under which some blast waves make rockburst take place afterman-made excavation. So, it is meaningful to investigate thecharacteristics of rock failure and fragmentation when three-dimensionalstatic load and dynamic load are coupling applied on rock, which sufferdisturbance of blast waves.According to the problem above, with the support of key projectsfrom NSFC "The effects of coupling between multiphase and fields andthe prevention of disaster in deep rock engineering" and "The experimentresearch for dynamic accumulative damage and constitutive relations ofrock at intermediated strain rate", this paper investigated "rockdynamical characteristic and rockburst mechanism underthree-dimensional static-dynamic couping loading. The main researchwork was enumerated as follows:Firstly, by using of the improved SHPB test equipment with thefunction of three-dimensional static-dynamic coupling loading, the test ofsiltstone failure/fragmentation with medium strain rate under coupledstatic-dynamic loading is carried out to investigate the dynamic responseand fragmentation characteristics, when siltstone is experienceddifferent horizontal stress and vertical stress on the condition of dynamicdisturbance with different frequency and amplitude. The experimentaland theoretical basis is provided for analyzing the pillar stability androckburst in deep mining.This paper used currency software of finite element ANSYS formodelling the rock specimen with the static-dynamic coupling. The resultof numerical modelling showed that the influence of dynamical disturbfor rock which endured high pressure is more obvious, the rock mass was destroied more drastically and abruptly, so such as the rockburst, with theenhancing of stress.Finally, on the basis of the above experiment, mechanism onfragmentation and failure of rock is analyzed. This paper summarized andaffirmed the work done by predecessor, and pointed out the localizationof statics theoretics in research of rockburst mechanism. The dynamicsmechanism of rockburst was analyzed, especially a new point of view,according to the work above.In short, the research of this dissertation, which is based on thefrontal of the subject, under the condition of 3D static-dynamic couplingloaded rock system, is useful for both theory and practice, and in specialfor the developing of research on characteristics of deep rockmass.