| 极端降雨作用下陕北梯田边坡稳定性分析 |
| 温永福1,2; 高鹏2,3; 穆兴民2,3; 赵广举2,3; 孙文义2,3
|
| 2018
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发表期刊 | 水土保持研究
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卷号 | 25期号:4页码:365-369 |
摘要 | 为了研究在极端降雨作用下梯田边坡稳定性,同时探究土体内部重要参数随降雨入渗变化规律,进行了人工
降雨作用下的梯田边坡的室内模型试验研究以及梯田边坡数值模拟分析。研究结果表明:在实施降雨的前 2h ,平均
入渗百分率为65% ,之后,入渗率由于地表径流的增加而随时间逐渐减少,一段时间(
8h )之后,入渗率降到一个相对
稳定值( 25% );降雨入渗造成土体中含水率增加,致使梯田边坡的抗剪强度由于有效应力的减少及土体吸水软化而降
低;降雨入渗影响下梯田边坡的滑动变形区为坡面以下 0~1. 0m ,变形量以坡面最大,从坡面到坡体深部逐渐减小,
梯田边坡崩塌类型为冲蚀引起的局部浅层崩塌破坏;随着降雨的持续,梯田边坡安全系数不断减小,在降雨5h后安
全系数 k s <1 ,梯田边坡发生垮塌。 |
其他摘要 | To better understand the collapse instability mechanism of terraced slope induced by extreme rain -
fall conditions and study some important features of soil internal parameters with the effect of rainfall simul
-
taneously , model tests and numerical simulation were carried out to research and discuss the terraced slope
under simulated rainfall.The results show that during the first 2hours of the rainfall
, the average infiltration
rate was 65% , thereafter , as the runoff increased , infiltration rate decreased over time ; 8hours later , infil -
tration rate fell to a relatively stable value (
25% ); under the influence of rainfall infiltration , the sliding de -
formation zone of the terraced slope was between 0~1.0 m below the slope ; the maximum amount of
deformation in the slope gradually decreased from the slope surface to the depth of the slope
, and the collapse
type was caused by the erosion of the local shallow destruction
; rainfall infiltration caused the pore water
pressure and water content to increase and the suction to decrease , so that the shear strength of slope soil
reduced due to the reduction of effective stress and soil water softening.The double effect of rainfall infiltra -
tion may be one of the main causes related to erosion and collapse of terraced slope induced by
rainfall ; the
safety factor of the terrace slope is decreasing
with the duration of rainfall and terraced slope collapsed after
5 - hours rainfall. |
关键词 | 极端降雨
梯田边坡
含水率
安全系数
|
收录类别 | 中文核心期刊要目总览
|
语种 | 中文
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文献类型 | 期刊论文
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条目标识符 | sbir.nwafu.edu.cn/handle/361005/10295
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专题 | 水保所知识产出(1956---)
|
作者单位 | 1.西北农林科技大学 水利与建筑工程学院 2.西北农林科技大学 水土保持研究所 黄土高原土壤侵蚀与旱地农业国家重点实验室 3.中国科学院 水利部 水土保持研究所 黄土高原土壤侵蚀与旱地农业国家重点实验室
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推荐引用方式 GB/T 7714 |
温永福,高鹏,穆兴民,等. 极端降雨作用下陕北梯田边坡稳定性分析[J]. 水土保持研究,2018,25(4):365-369.
|
APA |
温永福,高鹏,穆兴民,赵广举,&孙文义.(2018).极端降雨作用下陕北梯田边坡稳定性分析.水土保持研究,25(4),365-369.
|
MLA |
温永福,et al."极端降雨作用下陕北梯田边坡稳定性分析".水土保持研究 25.4(2018):365-369.
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文件名:
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极端降雨作用下陕北梯田边坡稳定性分析_温永福.pdf
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格式:
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Adobe PDF
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