关键词: 尾砂堆积坝, 含水率, 振动台试验, 数字图像相关技术, 破坏模式, 损伤演化

Abstract: In order to analyze the effect of water content on the vibration damage of the tailings accumulation dams,shaking table tests were conducted for different watercontent accumulation dam models on the basis of a series of indoor direct shear tests,and the digital image correlation (DIC) technology was used to analyze their vibration damage patterns,local deformation and damage evolution characteristics.The test results show that the cohesion of tailings shows a trend of increasing and thereafter decreasing as the moisture content increases,which gives a cω fitting formula,but the internal friction angle of tailings does not change much with moisture content,displaying a fluctuation in the range of 30.03°~33.44°.What′s more,the cohesion plays a pivotal role on the stability and cracking moment of the tailings dam.The water content exerts a critical effect on the rupture mode and a damage pattern of the accumulation dam,which shows "local single type" tensile damage at a highwater content of 16.0% and "staggered collapse type" tensileshear compound damage at a low water content of 5.6%.With the increase of water content,the vibration damage mode of the tailings accumulation dam transitions from tensile shear damage to tension damage dominated.Based on the statistical analysis of the local strain field,the damage factor is proposed.The damage factor of 5.6% waterbearing dam shows that a sudden up trend increases,and brittle damage appears,while 13.0% and 16.0% waterbearing dams show ductile damage in the later stages.