铜川市缓动式低速滑坡的滑移动力学机理

ON THE SLIDING DYNAMIC MECHANISM OF THE LAND- SLIDES WITH SLIGHT-STARTING AND LOW-SPEED IN TONGCHUAN CITY

铜川市区发育有为数甚多的缓动式低速滑坡。本文探讨了此类滑坡的滑移动力学机理。研究认为,由于滑面的峰—残微差效应、滑面动静摩擦阻力相近效应和滑带塑性蠕变耗能效应的综合作用,滑坡启动呈现缓动性;滑体低能效应、滑体低推力效应、滑带(面)强度自行恢复效应和滑体自行消能效应的叠加作用,导致滑坡以低速运移。

The landslide with slight-starting and low-speed is a dynamic kind of landslides in natural and engineering geological environments. It is prominently different from the landslide with violent-starting and high-speed in growth, distribution and harmfulness. There are a number of landslides of this kind in Tongchuan City. Based upon different kinds of data and a large number of facts, according to the essence-structural characteristics of the landslides, and using some of basic laws of dynamics, the writers approach the slide dynamic mechanism of the landslide. It is thought that the comprehentive action of these effects, such as tiny difference between the peak and residual strength on its slide, slight difference between the static and moving friction resistances on its slide face, and dissipating energy from plastic creeping deformation within the slide zone, results in slight-starting in the initiate course of starting motion of the landslide. The comprehensive action of these effects, such as low-energy, low-thrust and self-recovering of strength of the slide face, self-dissipating energy of the slide mass, results in low-speed in the sliding of the landslide.