Study On The Mechanical Properties Of Skarn Under High Temperature

In view of the lack of research on the mechanical properties of deep rocks in the southwest region under high temperature,this paper intends to carry out experimental research under high temperature through high temperature heating devices,static equipment and Hopkinson pressure rods,using skarn as the research object The following results were obtained:(1)The XK7L-12 box-type resistance furnace was used to heat skarn at high temperature,and the temperature of skarn basic physical parameters was measured and analyzed Effect,observed and compared the difference between the apparent color and the number and length of apparent cracks of the skarn rock specimen after high temperature and the normal temperature specimen.(2)The uniaxial compression experimental study was carried out on the skarn with high temperature natural cooling and high temperature water through the constant stress pressure test machine,the stress-strain curve under uniaxial compression was obtained,and the static mechanics of skarn was calculated and analyzed Indicators and the change law of the failure form with temperature and cooling method.(3)Based on the uniaxial impact compression and splitting experiments of the Hopkinson pressure bar,the skarn under different impact loads,the dynamic index and the change law of the failure form are derived,and the strain rate,impact rate and temperature are derived The empirical formula between the two;from the perspective of energy,explored the law of energy change in the dynamic load experiment with time,and combined with the macroscopic damage characteristics of the rock,and made a corresponding comparison with the energy change law.(4)Through XRD mineral analysis technology and SEM scanning electron microscope technology,the microstructure characteristics of skarn under high temperature were studied from the aspects of fracture morphology and main mineral composition changes of the fragments,and the changes of microstructure characteristics were studied.Compared with the macroscopic destruction characteristics of skarn,the phenomenon of deterioration of mechanical properties of skarn under high temperature is explained from a microscopic perspective.