Experimental Study On Dynamic Mechanical Properties Of Limestone After High Temperature

The dynamic mechanical properties of rock under impact loading have been an important research direction in rock mechanics.With the continuous deepening of research by experts and scholars in recent years,many researchers have achieved fruitful results in rock dynamic mechanical properties and constitutive models through a large number of impact tests.However,there is less research on the dynamic mechanical properties of limestone after high temperature.This article mainly carried out dynamic impact compression and dynamic splitting tensile test for limestone after different high temperature through the SHPB test device.Studied the variation of stress-strain curve,peak strength,peak strain,strain rate,elastic modulus and failure characteristics of limestone after different high temperature.1.The impact compression tests of limestone after different high temperature of25°C,200°C,400°C and 600°C under different loading pressures of 0.4MPa,0.5MPa,0.6MPa,0.7MPa,0.8MPa,0.9MPa are carried out through the SHPB test device.Analysis the stress-strain curves and dynamic mechanical properties including peak strength,elastic modulus and peak strain of limestone under different high temperature and different strain rates.Analysis the failure characteristics of limestone after different strain rates.2.The impact compression tests of limestone after different high temperature of25°C,100°C,200°C,300°C,400°C,500°C,600°C,700°C under the axial pressure of20 MPa and non-axial pressure at loading pressure of 0.5 MPa are carried out through the SHPB test device.Analysis the effect of axial pressure on the stress-strain curve and dynamic mechanical properties including peak strength,strain rate,elastic modulus and peak strain of limestone after different high temperature.Analysis the effect of axial pressure on the failure characteristics of limestone after different high temperature.3.The impact compression tests of different limestone after different high temperature of 25°C,100°C,200°C,300°C,400°C,500°C,600°C,700°C,800°C under 0.5MPa loading pressure are carried out through the SHPB test device.Analysis the effect of lithology on the stress-strain curve and dynamic mechanical propertiesincluding peak strength,strain rate,elastic modulus and peak strain of limestone after different high temperature.Analysis the effect of lithology on the failure characteristics of limestone after different high temperature.4.The dynamic splitting tensile test of limestone after different high temperature of 25°C,50°C,100°C,150°C,200°C,250°C,300°C,400°C,500°C,600°C under0.4MPa loading pressure are carried out through the SHPB test device.Analysis the stress-strain curves and dynamic mechanical properties including peak strength and strain rate of limestone under different high temperature.Analysis the failure characteristics of limestone after different high temperature.