[1]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(04):365-369.
　WEN Yongfu,Gao Peng,MU Xingmin,et al.Analysis on the Stability of Slope in Northern Shaanxi Under Extreme Rainfall[J].Research of Soil and Water Conservation,2018,25(04):365-369.
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极端降雨作用下陕北梯田边坡稳定性分析

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 25 期数: 2018年04期 页码: 365-369 栏目: 出版日期: 2018-06-13
Title:
Analysis on the Stability of Slope in Northern Shaanxi Under Extreme Rainfall
作者:
温永福1,2, 高鹏2,3, 穆兴民2,3, 赵广举2,3, 孙文义2,3
1. 西北农林科技大学 水利与建筑工程学院, 陕西 杨凌 712100;
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, 陕西 杨凌 712100;
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, 陕西 杨凌 712100
Author(s):
WEN Yongfu1,2, Gao Peng2,3, MU Xingmin2,3, ZHAO Guangju2,3, SUN Wenyi2,3
1. College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China;
3. Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China
关键词:
极端降雨; 梯田边坡; 含水率; 安全系数
Keywords:
extreme rainfall; terraced slope; water content; safety factor
分类号:
S157.3
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2 h，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（8 h）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0~1.0 m，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5 h后安全系数ks<1，梯田边坡发生垮塌。
Abstract:
To better understand the collapse instability mechanism of terraced slope induced by extreme rainfall conditions and study some important features of soil internal parameters with the effect of rainfall simultaneously, 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 2 hours of the rainfall, the average infiltration rate was 65%, thereafter, as the runoff increased, infiltration rate decreased over time; 8 hours later, infiltration rate fell to a relatively stable value (25%); under the influence of rainfall infiltration, the sliding deformation 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 infiltration 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.

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备注/Memo

收稿日期:2017-08-07;改回日期:2017-09-06。
基金项目:水利公益性行业科研专项（201501049）；中国科学院西部之光项目；国家重点研发计划专题计划（2016YFC0501707）
作者简介:温永福(1992-),男,河北沧州人,硕士研究生,研究方向为水土保持和生态水文。E-mail:2548065512@qq.com
通讯作者:高鹏(1976-),男,陕西宝鸡人,博士,副研究员,硕士生导师,主要从事水土保持和流域生态水文研究。E-mail:gaopeng@ms.iswc.ac.cn

更新日期/Last Update: 1900-01-01