Experimental Study On Dynamic Performance Of Asphalt Concrete Core Wall Material Of High Earth Rock Dam

The development of asphalt concrete core wall dam is rapidly, while china’s earthquake(?) is well developed.Our country has abundant water resources in Southwest China where is(/)quake prone areas, we will encounter the dam in these essential areas of high intensity in(?) future.However, due to the high embankment dam asphalt concrete core wall dynamic(?)mance not well understood And we are doubt for the seismic performance of asphalt(?)e core rockfill dam. It has restricted the development of the asphalt concrete core dam.(?) er to study the dynamic performance of high rockfill dam with asphalt concrete core wall.(?) to further promote the development of asphalt concrete core rockfill dam. In this paper.(?) dynamic performance of asphalt concrete under dynamic torsional shear load and the(?) performance of asphalt concrete with different bitumen grades arc studied, The main(?) sionns are as follows:(1)The dynamic torsional shear tests with different confining pressures show that the(?) pressure has an effect on the dynamic performance of asphalt concrete under dynamic(?) shear loads: In the range of confining pressure (0.2MPa, 0.4MPa, 0.6MPa. 0.8MPa),the confining pressure, the higher the distribution of dynamic shear stress and strain(?) of asphalt concrete, and the dynamic shear stress corresponding to the same shear strain is(?) With the increase of confining pressure, the dynamic shear strength and dynamic shear(?) increasc.(2)The dynamic torsional shear tests with different consolidation ratios show that the(?)datios has an effect on the dynamic performance of asphalt concrete under(?)torsional shear loads: In the range of test consolidation ratio (1.O,1.2,1.6), With the(?)of consolidation ratio, dynamic shear stress, dynamic shear modulus and dynamic(?)ess corresponding to the same dynamic shear strain increase first and then decrease.(3) The test of small beam bending results show that asphalt grade has influence on the flexural performance of asphalt concrete: the strain increases with the increase of asphalt grade,and the increase of asphalt grade is helpful to improve the deformation ability of asphalt concrete, but the bending strength and modulus decrease. Effect of asphalt grade of asphalt concrete strength decreases with the increase of asphalt grade.(4) Dynamic triaxial tests of asphalt concrete with different grades show that asphalt grade has influence on the dynamic performance of asphalt concrete: With the increase of asphalt grade of asphalt concrete, the corresponding dynamic stress-strain relation curve decreased.With the same dynamic strain, the dynamic stress of asphalt concrete decreases and the dynamic strain increases with the same dynamic stress; The dynamic modulus of asphalt concrete decreases with the increase of asphalt grade, but the range is not very large, The change of asphalt grade has little effect on the damping ratio of asphalt concrete, and the damping ratio is varied between 0.1～0.35.