Study On Uniaxial Dynamic Compressive Properties And Size Effect Of Low Temperature Hydraulic Asphalt Concrete

Most of the water conservancy and hydropower facilities currently under construction in China are located in the northwest and southwest areas with high altitude,low temperature and frequent earthquakes.Hydraulic asphalt concrete is widely used in the anti-seepage facilities of water conservancy and hydropower projects with its excellent anti-seepage performance.At present,the study of dynamic mechanical properties of hydraulic asphalt concrete is a weak point in the seismic research of hydraulic anti-seepage facilities.In this paper,the dynamics of hydraulic asphalt concrete is tested by uniaxial dynamic compression test under different loading conditions under different loading conditions.The compression performance was initially explored.According to the structural theory of hydraulic asphalt concrete,a plurality of mixing ratios are selected by appropriate materials,and multi-factor analysis is carried out by orthogonal cracking test method.The asphalt content,filler content,gradation index and porosity,and splitting are compared and analyzed.The relationship of strength finally determines the appropriate mix ratio.The uniaxial dynamic compression performance of hydraulic asphalt concrete under dynamic and quasi-static loading rates under different temperature conditions was studied.The failure process of hydraulic asphalt concrete subjected to uniaxial dynamic compression under different temperature and different loading rates was explored,and different failure phenomena were explained.The relationship between temperature,loading rate and mechanical properties of hydraulic asphalt concrete was analyzed.The uniaxial compressive strain rate stress-strain constitutive model of hydraulic asphalt concrete under dynamic and quasi-static loading conditions was established,and the experimental data were fitted.The uniaxial compressive properties of three different sizes of asphalt concrete specimens were compared and analyzed.The damage of three sizes under the same loading conditions was explored,and the phenomenon was explained.The similarities and differences between the stress-strain curves of the specimens of different sizes were compared,and the compressive strength size effect and elastic modulus were introduced.The size effect degree is quantitatively strength size effect and elastic modulus were introduced.The size effect degree is quantitatively analyzed against the size effect phenomenon of compressive strength and elastic modulus.