【摘要】 映秀至汶川公路距"5.12"汶川地震震中最近,地震崩塌灾害最重。经过震后三年的详查,借助航片、3D激光扫描及岩体结构精细描述,对公路沿线典型地震崩塌的斜坡破坏部位、微地貌特征、坡度、坡体结构、岩体结构和地层岩性进行研究,运用DDA对八度区典型斜坡体发生崩塌的破坏机理进行模拟研究。结果表明,崩塌部位受控于岩体结构和基岩强风化层,同时,微地貌与发震断裂的位置关系造成的斜坡放大与地震背坡效应对崩塌影响明显。地震崩塌有拉裂-滑移、震动-溃散、震动-抛射三类破坏模式。更多还原

【Abstract】 Heavy collapses occurred along the Yingxiu Wenchuan highway,close to the 5?12Wenchuan earthquake epicenter.Aerial photographs,3Dlaser scanning and rock structure description are used to study the typical collapses along the highway.And DDA is used to simulate the failure mechanism of collapses at the area of 8degree intensity.The results show that the collapse sites are controlled by the rock structure and weathered base rock structure.Slope amplification effect and earthquake back slope effect exerted a significant impact on collapses.The collapse modes include crack-slip,vibration–scatter and vibration-projection failure modes.更多还原