降雨入渗对宁南山区黄土梯田边坡稳定性的影响

doi:10.11924/j.issn.1000-6850.casb20190800551

中国农学通报 ›› 2020, Vol. 36 ›› Issue (27): 88-98.doi: 10.11924/j.issn.1000-6850.casb20190800551

所属专题：农业气象

• 资源·环境·生态·土壤·气象 • 上一篇下一篇

降雨入渗对宁南山区黄土梯田边坡稳定性的影响

刘佳丽(), 田佳(), 梁志奇, 张志敏, 杨泽康, 马建文, 赵岩

宁夏大学农学院,银川 750021

收稿日期:2019-08-18 修回日期:2019-12-03 出版日期:2020-09-25 发布日期:2020-09-23
通讯作者: 田佳
作者简介:刘佳丽,女,1997年出生,宁夏银川人,在读硕士,研究方向:水土保持。通信地址:750021 宁夏银川市西夏区贺兰山西路贺兰山校区,Tel:0951-2061874,E-mail: 936606393@qq.com。
基金资助:
2018年大学生创新创业训练计划项目“宁南山区坡改梯工程对黄土边坡稳定性的影响”(2018107490044);2019年大学生创新创业训练计划项目“降雨入渗下的宁南山区黄土梯田稳定性及其优化设计研究”(2019107490009)

Rainfall Infiltration: Effects on Slope Stability of Loess Terraces in Mountainous Area of Southern Ningxia

Liu Jiali(), Tian Jia(), Liang Zhiqi, Zhang Zhimin, Yang Zekang, Ma Jianwen, Zhao Yan

School of Agriculture, Ningxia University, Yinchuan 750021

Received:2019-08-18 Revised:2019-12-03 Online:2020-09-25 Published:2020-09-23
Contact: Tian Jia

摘要/Abstract

摘要：

为了研究降雨入渗对宁南山区黄土梯田边坡稳定性的影响。采用ABAQUS软件建立降雨入渗下的宁南山区黄土梯田边坡稳定性有限元模型,研究了水平梯田、隔坡梯田、原始边坡（对照）3种边坡类型,在降雨入渗强度(28~38 mm/h)和边坡坡度(15°—30°)下的破坏时间和安全系数的变化规律。结果表明:降雨入渗下,黄土梯田边坡的破坏时间随降雨入渗强度的增大而减小,且呈幂函数关系,水平梯田的破坏时间显著高于隔坡梯田和原始边坡;安全系数也随降雨入渗强度的增大而减小,但呈线性关系,水平梯田的安全系数与隔坡梯田和原始边坡并无显著差异。降雨条件下,修筑梯田能增加浅层梯田边坡的稳定性,而对于深层梯田边坡的稳定性影响不大。

关键词: 降雨入渗, 黄土梯田, 边坡稳定, 有限元, 宁南山区

Abstract:

The paper aims to study the effects of rainfall infiltration on the slope stability of loess terraces in mountainous area of southern Ningxia. We established a finite element model for the stability analysis by using the software ABAQUS, and studied the variation of failure time and safety factors of 3 different types of terraced slopes: the level terrace, alternate terrace and original slope (control) under different rainfall infiltration intensities (28-38 mm/h) and the slope gradient (15°-30°). The results showed that: the failure time of the terraced slope decreased with the increase of rainfall infiltration intensity and satisfied the power function relation; the failure time of the level terrace was significantly higher than that of the alternate terrace and original slope; the safety factors of the terraced slope decreased with the increase of the rainfall infiltration intensity too, but satisfied the linear function relation; the safety factors of the level terrace had no significant difference between the alternate terrace and original slope. Under the condition of rainfall, the construction of loess terraces can increase the stability of shallow terrace slope, but has little effect on the stability of deep terrace slope.

Key words: rainfall infiltration, loess terrace, slope stability, finite element, mountainous area of southern Ningxia

中图分类号:

S859.84

刘佳丽, 田佳, 梁志奇, 张志敏, 杨泽康, 马建文, 赵岩. 降雨入渗对宁南山区黄土梯田边坡稳定性的影响[J]. 中国农学通报, 2020, 36(27): 88-98.

Liu Jiali, Tian Jia, Liang Zhiqi, Zhang Zhimin, Yang Zekang, Ma Jianwen, Zhao Yan. Rainfall Infiltration: Effects on Slope Stability of Loess Terraces in Mountainous Area of Southern Ningxia[J]. Chinese Agricultural Science Bulletin, 2020, 36(27): 88-98.

图/表 11

参考文献 30

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土壤类型	小于该粒径的土质量百分数/%							d₁₀/mm	d₆₀/mm
黄土	<5 mm	<2 mm	<1 mm	<0.5 mm	<0.25 mm	<0.1 mm	<0.075 mm	d₁₀/mm	d₆₀/mm
黄土	100	91.71	78.22	44.72	31.33	22.15	18.03	0.02	0.74

土壤类型	小于该粒径的土质量百分数/%							d₁₀/mm	d₆₀/mm
黄土	<5 mm	<2 mm	<1 mm	<0.5 mm	<0.25 mm	<0.1 mm	<0.075 mm	d₁₀/mm	d₆₀/mm
黄土	100	91.71	78.22	44.72	31.33	22.15	18.03	0.02	0.74

变异来源（因素）	Ⅲ类平方和	自由度	均方	F 值	P 值	分布值X/%
边坡坡度	11.732	3	3.911	552.119	0.001^**	75.442
梯田边坡类型	0.446	2	0.223	31.448	0.001^**	2.867
降雨入渗强度	2.942	5	0.588	83.065	0.001^**	18.918
修正后总计	15.551	71

变异来源（因素）	Ⅲ类平方和	自由度	均方	F 值	P 值	分布值X/%
边坡坡度	11.732	3	3.911	552.119	0.001^**	75.442
梯田边坡类型	0.446	2	0.223	31.448	0.001^**	2.867
降雨入渗强度	2.942	5	0.588	83.065	0.001^**	18.918
修正后总计	15.551	71

梯田边坡类型	梯田边坡类型	平均值差值	标准误差	显著性	95%置信区间
梯田边坡类型	梯田边坡类型	平均值差值	标准误差	显著性	下限	上限
水平梯田	隔坡梯田	0.1421	0.0243	0.001^**	0.0935	0.1907
水平梯田	原始边坡	0.1838	0.0243	0.001^**	0.1352	0.2323
隔坡梯田	原始边坡	0.0417	0.0243	0.091	-0.0069	0.0902
隔坡梯田	水平梯田	-0.1421	0.0243	0.001^**	-0.1907	-0.0935
原始边坡	隔坡梯田	-0.0417	0.0243	0.091	-0.0902	0.0069
原始边坡	水平梯田	-0.1838	0.0243	0.001^**	-0.2323	-0.1352

降雨入渗对宁南山区黄土梯田边坡稳定性的影响

Rainfall Infiltration: Effects on Slope Stability of Loess Terraces in Mountainous Area of Southern Ningxia

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变异来源	Ⅲ类平方和	自由度	均方	F 值	P 值	分布值X/%
边坡坡度	2.896	3	0.965	82.085	0.001^**	52.837
梯田边坡类型	0.008	2	0.004	0.319	0.727	0.146
降雨入渗强度	0.206	3	0.069	5.836	0.001^**	3.758
降雨入渗历时	0.808	2	0.404	34.346	0.001^**	14.742
修正后总计	5.481	143

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