Analysis of Mechanical Properties and Energy Dissipation of Limestone under One-dimensional Dynamic and Static Combined Loading
In order to improve the rock breaking efficiency and energy consumption of limestone,one-dimensional dynamic and static combination loading tests of surrounding rock were carried out by separated Hopkinson pressure bar,and the effects of different strain rates and axial pressure gradients on the dynamic compressive strength,energy utilization and failure of limestone were analyzed.The results show that the dy-namic compressive strength of limestone specimens under impact load increases linearly with the increase of strain rate when axial pressure is constant.Under the same strain rate,the dynamic compressive strength of limestone increases with the increase of axial pressure,but the strength decreases when the axial pressure exceeds a certain threshold.The transmission ratio of limestone under different axial compression shows an exponential decreasing trend with the increase of incident energy.When axial pressure is constant,the high-er the loading strain rate is,the higher the energy consumption density is and the faster the deformation of limestone is.Under the condition of similar strain rate,the energy consumption density will be significantly reduced if the axial pressure is increased appropriately,but the energy consumption density will be in-creased if the axial pressure is too large.Therefore,the comprehensive effect of axial pressure and impact load should be considered when crushing limestone.
limestoneone-dimensional dynamic and static combinationdynamic compressive strengthincident energyenergy consumption density
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