| 坡脚型场地对滑体运动的减速机制研究 |
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| 引用本文： | 曾耀勋,樊晓一,段晓冬. 坡脚型场地对滑体运动的减速机制研究[J]. 水土保持通报, 2014, 0(4): 193-196 |
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| 作者姓名： | 曾耀勋 樊晓一 段晓冬 |
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| 作者单位： | 西南科技大学土木工程与建筑学院, 四川绵阳 621010;西南科技大学土木工程与建筑学院, 四川绵阳 621010;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;西南科技大学土木工程与建筑学院, 四川绵阳 621010 |
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| 基金项目： | 国家自然科学基金项目"岩土体下垫面对降雨滑坡运动参数的作用机制及主控关系"(41272297); 国家科技支撑计划项目(2011BAK12B01); 中国博士后科学基金项目(2013M531943); 西南科技大学研究生创新基金(13ycjj16) |
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| 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。
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| 关 键 词： | 滑体运动 坡脚型场地 减速机制 通用离散元程序 |
| 收稿时间： | 2013-09-23 |
| 修稿时间： | 2013-10-26 |
Deceleration Mechanism of Slope Foot Site to Landslide Movement |
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| ZENG Yao-xun,FAN Xiao-yi and DUAN Xiao-dong. Deceleration Mechanism of Slope Foot Site to Landslide Movement[J]. Bulletin of Soil and Water Conservation, 2014, 0(4): 193-196 |
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| Authors: | ZENG Yao-xun FAN Xiao-yi DUAN Xiao-dong |
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| Affiliation: | School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China;School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China;State Key Laboratory of Geo-hazard Prevention and Geo-environment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, China;School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China |
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| 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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| Keywords: | landslide movement slope foot condition deceleration mechanism |
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