Analysis of the stability of the Lisizhuang landslide in Shunping County, Hebei Province
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摘要:
李思庄滑坡为河北省顺平县境内潜在危险性最大的一残坡积堆积层滑坡，近年由于削坡建房，滑坡稳定性降低，极端降雨条件下存在复活可能。在野外调查确定滑坡结构特征的基础上，采用改进Mein-Larson降雨入渗模型分析不同降雨强度及持时对李思庄滑坡安全系数影响，运用有限差分软件FLAC3D计算分析该滑坡在天然和极端降雨工况下的稳定状态。研究结果表明：天然状态下，边坡潜在滑移面为基岩与残坡积层分界面，边坡安全系数为1.18，未发生失稳破坏；随降雨历时增加，潜在滑移面由基岩与残坡积层分界面转移到湿润峰面，当湿润峰达到基岩与残坡积层分界面，边坡安全系数为0.83，属不稳定状态。并对李思庄滑坡初步提出设置挡土墙和截排水沟的治理建议。
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关键词:
- 堆积层滑坡 /
- 稳定性 /
- Mein-Larson降雨入渗模型 /
- FLAC3D
Abstract:The Lisizhuang landslide is the most potentially dangerous accumulation landslide in a residual slope accumulation layer. The toe of the landslide slope was cut to meet the need of construction land, reducing the stability of the landslide. Under the extreme rainfall conditions, the landslide may revive. Based on the field survey, the structural characteristics and main factors affecting the stability of the Lisizhuang landslide are determined. An improved Mein-Larson rainfall infiltration model was utilized to analyze the influence of different rainfall intensities and durations on the safety factor of the landslide. And the finite difference software FLAC3D was used to simulate the stability of the landslide under natural conditions and extreme rainfall conditions. The results show that:In the natural state, the potential slip surface of the slope is the interface between the bedrock and the residual slope, and the safety factor is 1.18. The landslide stays stable. With the increase of the rainfall duration, the potential slip surface is transferred from the interface between the bedrock and the residual slope to the wetting front. When the wetting front reaches the boundary between the bedrock and the residual slope, the numerical simulation shows that the safety factor of the landslide is 0.83, and the landslide is unstable. Retaining wall and drainage ditch for slope treatments of the Lisizhuang landslide are put forward in this paper.
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Key words:
- accumulation landslide /
- stability /
- Mein-Larsonrn rainfall infiltration model /
- FLAC3D
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表 1 改进Mein-Larson降雨入渗模型岩土体物理力学参数
Table 1. Physical and mechanical parameters of the Lisizhuang landslide based on the improved Mein-Larson rainfall infiltration model
残余含水率
θr/%饱和含水率
θs/%曲线拟合参数
α/m-1曲线拟合参数
n饱和渗透系数
ks/（m·s-1）土的重度
γt/（kN·m-3）有效内摩擦角
φ′/（°）有效黏聚力
c′/kPa材料属性
φb/（°）1.5 25 3.5 1.5 5.78×10-6 22.2 19 3.5 25 
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表 2 Fs=1时各降雨强度失稳所需历时
Table 2. Duration required for instability at each rainfall intensity when Fs=1
降雨强度/（mm/d） 300 250 200 150 100 50 降雨历时/h 18 20 24 30 40 62 潜在滑移面深度/m 2.3 1.9 1.9 1.8 1.7 1.6
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表 3 数值模拟岩土体物理力学参数
Table 3. Numerical simulation values of physical and mechanical parameters of the rock and soil mass
岩性 密度/（g·cm-3） 弹性模量/MPa 泊松比μ 粘聚力/kPa 内摩擦角/（°） 基岩 2.95 37700 0.37 35000 47 滑体（天然状态） 1.87 8.5 0.35 5.5 27 滑体（极端降雨状态） 2.22 6.6 0.37 3.5 19 冲洪积物 1.82 9.0 0.30 65 31
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