重庆武隆鸡冠岭岩质崩滑-碎屑流过程模拟

Simulation of the process of the Jiguanling rock avalanche in Wulong of Chongqing

1994年乌江重庆武隆段左侧岸坡鸡冠岭发生大型岩质崩滑,崩塌体碰撞解体后沿沟谷形成碎屑流,碎屑流体高速入江激起涌浪,最终形成堰塞湖,造成重大人员伤亡和经济损失。本文在滑坡现场工程地质调查的基础上,阐述了鸡冠岭崩滑-碎屑流的基本特征,对鸡冠岭崩滑-碎屑流运动过程中碰撞和铲刮等现象进行了分析,并基于DAN3D动力分析软件反演了鸡冠岭崩滑-碎屑流运动全过程,得到了崩滑-碎屑流速度分布规律和堆积体分布特征,模拟结果与滑坡的基本特征与堆积体分布特征基本吻合。鸡冠岭的研究成果较少,本文从数值模拟的角度剖析了鸡冠岭崩滑-碎屑流的动力特性,完善了鸡冠岭崩滑的研究。本文的研究结果为崩滑动力特性及滑坡涌浪效应研究提供了依据。

A large rock avalanche occurred on the left bank of the Wujiang river in 1994. Body of collapsed rocks broke into coarser rocks during the collision and the coarser rocks were transformed into debris flow along the valley with a high speed. The debris flow rushed into the Wujiang river and lead a surge effect. In addition,the river was blocked,causing heavy casualties and economic losses. In this paper,geological information of the Jiguanling is obtained on the basis of the engineering survey and the general characteristics of this catastrophic event are summarized. Phenomena of collision and scraping are analyzed during the motion of debris flow. The process of all run-out movement of debris is simulated by the dynamic analysis software DAN3 D. The results can retrieve the movement of the rock avalanche. The velocity contours and deposition of the Jiguanling rock avalanche are figured out. The simulation results have a good agreement with the motion characteristics of the Jiguanling rock avalanche and the basic characteristics of landslide deposition. In this paper,the dynamic characteristics of the Jiguanling rock avalanche is analyzed through numerical simulation,which may improve the study of the sliding of the Jiguanling rock avalanche. The results provide a basis for characteristics of the landslide dynamic effect and the landslide surge effect.