CAJ | 학술논문

青川东河口滑坡-碎屑流是"5·12"汶川大地震触发的典型高速远程滑坡,滑坡自高程1300m处开始滑动,总滑程约2400m,致使780余人遇难.野外调研结果表明,该滑坡自启动到最终静止,分别经历了滑坡启动阶段、重力加速阶段、圈闭气垫效应飞行阶段、撞击折返阶段及长距离滑动堆积阶段5个重要动力过程,最终抵达下寺河左岸的红花地村并形成堰塞湖.文中通过对该高速远程滑坡-碎屑流的地质背景及形态特征进行剖析认为,东河口滑坡启动区的断层破碎带、局部凸起地形以及力学性质较差的千枚岩、板岩的存在,对该滑坡的启动均有着显著影响;滑坡体在运行一段距离后是否可以继续保持高速远程滑动,除了有利的地形外,滑体滑动路径上高含水量的溪流堆积物的存在,是促使该滑坡成为高速远程滑坡-碎屑流的重要原因之一.
청천동하구활파-쇄설류시"5·12"문천대지진촉발적전형고속원정활파,활파자고정1300m처개시활동,총활정약2400m,치사780여인우난.야외조연결과표명,해활파자계동도최종정지,분별경력료활파계동계단、중력가속계단、권폐기점효응비행계단、당격절반계단급장거리활동퇴적계단5개중요동력과정,최종저체하사하좌안적홍화지촌병형성언새호.문중통과대해고속원정활파-쇄설류적지질배경급형태특정진행부석인위,동하구활파계동구적단층파쇄대、국부철기지형이급역학성질교차적천매암、판암적존재,대해활파적계동균유착현저영향;활파체재운행일단거리후시부가이계속보지고속원정활동,제료유리적지형외,활체활동로경상고함수량적계류퇴적물적존재,시촉사해활파성위고속원정활파-쇄설류적중요원인지일.
The Donghekou landslide-debris flow is a typical rapid long run-out landslide triggered by the great Wenchuan earthquake. It started from the elevation of 1300 m and caused 780 deaths, with a total long run-out of 2400 m. Field investigations show that, during the sliding process from start-up to stop, this landslide-debris flow experienced the following five dynamical stages. They are the starting-up stage, the gravity speed-up stage, the enclosure air cushion effect stage, the impact reentry stage and the long run-out sliding accumulation stage. Finally, the debris reached the Honghuadi village, which is located at the left bank of the Xiasihe River, causing the formation of dammed lakes. By analyzing the geological setting and feature of this landslide-debris flow, this paper draws a conclusion that the initiation of Donghekou landslide-debris flow is mainly affected by the fault crush belt, the local convex landform and the phyllite and carbon slate with weak mechanical property. For the rapid and long run-out sliding of this landslide-debris flow, the water containing condition of the slope debris on sliding route is an important factor, besides the advantage landform.