降雨类型对浅层滑坡稳定性的影响

罗渝; 何思明; 何尽川

doi:10.3799/dqkx.2014.118

降雨类型对浅层滑坡稳定性的影响

doi: 10.3799/dqkx.2014.118

罗渝^{1, 2,},
何思明^{1, 2, ,},
何尽川³

1.
中国科学院山地灾害与地表过程重点实验室, 四川成都 610041
2.
中国科学院水利部成都山地灾害与环境研究所, 四川成都 610041
3.
中国市政工程西南设计研究总院, 四川成都 610081

基金项目:

国家自然科学基金项目 41401004

国家自然科学基金项目 41272346

国家科技支撑项目 2011BAK12B03

详细信息

作者简介:
罗渝(1981-), 女, 助理研究员, 博士, 主要从事降雨滑坡形成机理及防治研究.E-mail: ly@imde.ac.cn

通讯作者:
何思明, E-mail: hsm@imde.ac.cn

中图分类号: P642.22
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出版历程
- 收稿日期: 2013-12-17
- 刊出日期: 2014-09-01

Effect of Rainfall Patterns on Stability of Shallow Landslide

Luo Yu^{1, 2
,},
He Siming^{1, 2
, ,},
He Jinchuan³

1.
Key Laboratory of Mountain Hazards and Surface Processes, CAS, Chengdu 610041, China
2.
Institute of Mountain Hazards and Environment, CAS, Chengdu 610041, China
3.
Southwest Municipal Engineering Design & Research Institute of China, Chengdu 610081, China

摘要

摘要: 在降雨与浅层滑坡稳定性关系的研究中, 目前的研究往往忽略了降雨类型的影响.因此, 选取4种具有代表性的降雨类型: 均匀型、递增型、递减型以及峰值型为对象, 基于Rosso提出的降雨强度与地下水关系模型, 构建考虑降雨类型的浅层滑坡地下水位高度随降雨时间的变化关系, 研究不同降雨类型对浅层滑坡地下水位变化的影响.进而, 结合无限边坡理论, 建立浅层滑坡的稳定性计算模型, 研究不同降雨类型对浅层滑坡稳定性的影响.研究结果表明: 降雨类型对浅层滑坡稳定性的影响是明显的, 递增型降雨作用下的浅层滑坡安全系数最小, 其次是均匀型降雨, 再次是峰值型降雨, 最大的是递减型降雨; 同时在确定浅层滑坡临界降雨量和进行区域浅层滑坡易发性研究时降雨类型的影响不容忽视.
- 地下水 /
- 浅层滑坡 /
- 降雨类型 /
- 稳定性 /
- 无限边坡 /
- 地质灾害
Abstract: The effect of the rainfall patterns is often ignored in studies of the relationship of rainfall versus shallow stability of landslide. This paper takes four representative rainfall patterns including uniform, delayed, advanced and central ones as the object of study to explore the effect of the rainfall patterns on the height of ground water, based on the hillslope hydrological model proposed by Rosso. And then the infinite slope failure model is applied to establish the stability calculation model for shallow landslide, and the effect of the rainfall patterns on shallow landslide stability is analyzed. Results show that rainfall patterns have strong effect on the stability of shallow landslide, with the delayed rainfall having the lowest safety factor for shallow landslide, followed by uniform rainfall, then central rainfall, and lastly the advanced rainfall. It is found necessary to consider the effect of rainfall patterns for determining of the critical rainfall and analyzing of the susceptibility of shallow landslide in a region.
- underground water /
- shallow landslide /
- rainfall patterns /
- stability /
- infinite slope /
- geologic hazard

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图 1 坡地水文模型

a.单元网格图平面视图；b.地下水文模型

Fig. 1. Hydrological model of shallow slope

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图 2 4种降雨类型的降雨强度时间

Fig. 2. Rainfall intensity versus time of four rainfall patterns

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图 3 浅层滑坡稳定性计算模型

Fig. 3. Computation model for stability analysis of shallow landslide

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图 4 不同降雨类型下的地下水位与降雨时间关系

Fig. 4. Ground water level versus time for different rainfall patterns

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图 5 不同降雨类型下的浅层滑坡稳定性系数与降雨时间关系

Fig. 5. Safety factor of shallow landslide versus time for different rainfall patterns

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图 6 不同降雨类型下浅层滑坡的临界降雨量值

Fig. 6. The critical rainfall of different rainfall patterns

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图 7 不同降雨类型下深溪沟流域的不稳定浅层滑坡分布

a.递增型降雨；b.均匀型降雨；c.峰值型降雨；d.递减型降雨

Fig. 7. The distribution of unstable shallow landslide in Shenxigou watershed under different rain patterns

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图 8 递增型降雨与递减型降雨作用下的不稳定浅层滑坡分布区重叠对比

Fig. 8. The overlap comparison of the unstable shallow landslide distribution in Shenxigou watershed between rain pattern of delayed and advanced

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表 1 各岩组的物理力学指标参数

Table 1. The physical-mechanical properties of each petrofabric

岩土类别	天然密度P(kN/m³)	导水率T(m²/d)	内摩擦角φ(°)
三叠系上统须家河组	21.0	70	40
泥盆系中统养马坝组	19.6	95	38
震旦系下统	17.6	75	33

下载: 导出CSV

表 2 不同降雨类型下, 浅层滑坡不稳定区的面积比

Table 2. The ratio of the unstable area to the total area under the different rainfall patterns

降雨类型	递减型	递增型	峰值型	均匀型
面积比	0.182 7	0.242 3	0.183 8	0.189 0

下载: 导出CSV

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