Deceleration Mechanism of Slope Foot Site to Landslide Movement

ZENG Yao-xun; FAN Xiao-yi; DUAN Xiao-dong

doi:10.13961/j.cnki.stbctb.2014.04.052

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Deceleration Mechanism of Slope Foot Site to Landslide Movement

- Deceleration Mechanism of Slope Foot Site to Landslide Movement
- Bulletin of Soiland Water Conservation Vol. 33, Issue 4, Pages: 193-196(2014)
- 作者机构：
  
  1. 西南科技大学土木工程与建筑学院,四川,绵阳,621010
  2. 成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川,成都,610059
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2014.04.052
  CLC：
- Published：2014
- 稿件说明：
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ZENG Yao-xun, FAN Xiao-yi, DUAN Xiao-dong. Deceleration Mechanism of Slope Foot Site to Landslide Movement[J]. Bulletin of Soiland Water Conservation, 2014, 33(4): 193-196.
DOI：

ZENG Yao-xun, FAN Xiao-yi, DUAN Xiao-dong. Deceleration Mechanism of Slope Foot Site to Landslide Movement[J]. Bulletin of Soiland Water Conservation, 2014, 33(4): 193-196. DOI： 10.13961/j.cnki.stbctb.2014.04.052.

摘要

在野外滑坡现场调查的基础上

采用通用离散元程序(UDEC)构建基本几何模型

对坡脚型滑坡运动-停积过程进行模拟

研究了坡脚型场地条件(坡角及下垫面摩擦系数)对滑体运动的减速机制。通过各监测点的减速分布曲线的对比分析可知

在滑坡规模相同的条件下

坡脚型滑坡的减速阶段运距随着坡角的增加呈先增大而后减小的变化趋势。而由撞击坡脚引起的能量传递现象则是决定减速阶段运距长短的关键

也是造成同等规模下滑坡运距存在差异的原因。同时

下垫面摩擦系数越低

位能转化为动能的程度也越高

遭遇坡脚后滑体的碎屑化更加严重

导致运距更远。

Abstract

Based on the field survey

using universal distinct element code(UDEC) to build the basic geometric model

the movement-stop and accumulation process of slope foot site landslide were simulated

and then the deceleration mechanism of slope foot condition(including gradient and underlying surface friction coefficient) to landslide movement was analyzed. By comparising the deceleration distribution curve of the monitoring sites obtained under the same landside scale

the results showed that the sliding distance of the landslide in the speed decreasing process increased sharply first and then decreased with the increase of slope gradient

and the energy transfer caused by the slope strike was crucial to the sliding distance during the deceleration phase. Meanwhile

the sliding distance was closely related with the underlying surface friction

the lower of the underlying surface friction caused the more energy transfer and the more serious landslide disintegration.

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references

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