A Combination Of Coal And Rock In The Experimental Research On Dynamic Damage

With the mining depth increasing, the intensity is enhanced and mining conditions worsen,the frequency and intensity of percussive ground pressure is more and more big, the harm is more serious, we must strengthen awareness. Impact pressure is a kind of disturbance caused by underground mining severe dynamic damage, is under the effect of high pressure surrounding coal and rock burst phenomenon as a result of the rapid release of energy.Impact earth pressure is the result of a sudden release of energy, in this case, the energy stored in where? For these energy which can be artificially controlled release rate and intensity,in order to avoid shock pressure? Based on the above problems, this paper from the perspective of energy accumulation and release, composite rock mass destruction rule of dynamic experiment study, the purpose is to determine the specific energy accumulation horizon,theoretically puts forward effective measures to slow the progress of the energy release, which provide support for targeted prevention and treatment of rock bursts.Combination of coal rock mass and the impact damage process and energy conversion law theory analysis, the results show that the rock crack and space inside the influence of different,its energy accumulation capacity and energy dissipation of the size of the method has the very big difference, strength of materials, the homogeneous degree of the material and energy input rate determines the way of the coal sample energy dissipation; Combination coal and rock in the process of impact damage, the interaction between internal rock, constant energy relay and self-organizing system balance, some of the rock is the key to the energy accumulation layers.Opened to DE 17 coal seam mining coal, fine sandstone and coarse sandstone monomer deformation damage experiments, contrast analysis of the whole process of coal and rock monomer stress-strain curve, the result shows that coal peak before accumulated energy is low,less energy consumption when damage occurs, has a strong impact bias, before the thick sandstone and fine sand were accumulated energy is much higher than coal, instantaneous destruction, a large amount of energy released quickly, belongs to the weak. Rock compressive strength is larger, the greater the ability to store, the stronger the brittleness, elastic energy release more thoroughly. Three will fine sandstone and sandstone and coal rock according to the design requirements are combined, energy storage of components analysis combination specimens, the experimental results show that in different combination of hard and soft coal strata, elastic modulus of hard rock, is not easy to deformation, but energy storage is small, not easy to accumulate energy. And smaller elastic modulus of weak rock, the more advantage in energy storage, it is easier to accumulate energy, in the case of the overall impact groundpressure, play a leading role. Combination of energy in the coal and rock is mainly accumulated in weak rock, soft rock is the key to the energy accumulation layer. Combination of hardness difference, the greater the impact effect.Research results help to more deeply from the perspective of energy accumulation of rock bursts occurred in interpretation, the nature of the energy distribution of composite rock mass have a deeper understanding, to have the guide meaning to the scene of percussive ground pressure control.