库水位升降与降雨作用下大型滑坡体渗流稳定性分析

唐军峰; 唐雪梅; 肖鹏; 王航; 李佳武

doi:10.19509/j.cnki.dzkq.2021.0409

库水位升降与降雨作用下大型滑坡体渗流稳定性分析

doi: 10.19509/j.cnki.dzkq.2021.0409

唐军峰^1,,
唐雪梅^1, ,,
肖鹏²,
王航²,
李佳武²

基金项目:

国家电力投资集团五凌电力自主创新项目 320035FW0420180010

中国电建集团中南勘测设计研究院自主创新项目 YFHT-1856

详细信息

作者简介:
唐军峰(1977-), 男, 正高级工程师, 主要从事岩土工程方面的设计与科研工作。E-mail: 184683801@qq.com

通讯作者:
唐雪梅(1976-), 女, 副教授, 主要从事岩土工程方面的科研和教学工作。E-mail: 394693080@qq.com

中图分类号: P642.22
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- 被引次数: 0
出版历程
- 收稿日期: 2020-12-04

Analysis of seepage stability of large-scale landslide under water-level fluctuation and rainfall

摘要

摘要: 库岸滑坡体分布广泛，在库水位升降和降雨条件下极易失稳。三板溪水电站东岭信滑坡堆积体总方量2 000×10⁴ m³，最大厚度150 m，2006年水电站蓄水后滑坡体开始出现大变形，每年雨季加剧。首先经野外地质勘察和十余年监测数据整理，探明了地质条件和变形规律；其次使用SEEP/W模块对不同库水位升降速率、2019年库水位结合实测降雨条件下的饱和-非饱和流进行模拟，并采用SLOPE/W分别计算不同时刻的稳定系数。分析认为东岭信为超深层滑坡，其变形过程深受库水位升降和降雨影响；滑坡体具有明显的滞水特征，渗流过程复杂；在库水位上升过程中稳定系数不断下降，而在库水位消落过程中稳定性逐渐增强；在库水位上升和强降雨量共同作用下稳定性下降很快，汛后10 d左右达到最低值，此时的稳定性最差。本研究可用于指导库水位升降和降雨条件下大型滑坡体稳定性评价。
- 大型滑坡堆积体 /
- 降雨 /
- 库水位升降 /
- 渗透特征 /
- 稳定性
Abstract: Landslide is widely distributed on the bank of the reservoir, which is easy to cause instability under the condition of water level fluctuation and rainfall.Donglingxin landslide accumulation body of the Sanbanxi Hydropower Station has a maximum thickness of 150 m and a total volume of 2 000×10⁴ m³.The slope began to show large deformation at the first impoundment of the hydropower station in 2006, and the deformation is accelerated at the annual rainy season.Firstly, based on the field geological investigation and over ten years of monitoring data, the geological conditions and deformation law of the landslide body were obtained.Secondly, the saturated-unsaturated flow was calculated with different reservoir water levels fluctuation rates and the measured reservoir water level together with rainfall in 2019 by SEEP/W, and SLOPE/W was used to calculate the stability factors at different time.Results show that the slope is a super-deep landslide, which deformation process was deeply affected by the rise and fall of the reservoir water level and rainfall; The slope has characteristics of stagnant water, and the seepage process is complex; The stability coefficient decreases continuously in the process of reservoir water level rising while increases gradually in the process of reservoir water level falling; The stability declines rapidly with the combined effect of rising reservoir water level and heavy rainfall, and reaches the lowest value about 10 days after the flood season.The research can be used to guide the stability evaluation of large-scale landslide under water-level fluctuation and rainfall.
- large-scale landslide accumulation body /
- rainfall /
- water level fluctuation /
- seepage properties /
- stability

HTML全文

图 1 东岭信滑坡工程地质平面图

Figure 1. Engineering geological plane of Donglingxin landslide

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图 2 东岭信滑坡剖面

Figure 2. Profile of Donglingxin landslide

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图 3 东岭信滑坡后缘裂缝

Figure 3. Cracks at the back of Donglingxin landslide

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图 4 地表位移、库水位与降雨量关系

Figure 4. Relationship of surface displacement with the reservoir water level and rainfall

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图 5 排水洞内揭露的滑面及擦痕

Figure 5. Sliding surface and sliding scratch in drainage tunnels

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图 6 裂缝变形及地下水位关系曲线

Figure 6. Relationship between crack deformation and groundwater level

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图 7 排水洞流量与降雨量

Figure 7. Relationship between discharge of drainage tunnels and rainfall

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图 8 土水特征曲线

Figure 8. curve of soil-water characteristics

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图 9 渗透系数

Figure 9. Penetration function curve of covering layer

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图 10 不同库水位上升速率时滑坡体内地下水位的变化

a.上升速率为3×10^-6 m/s(0.26 m/d，169.8 d)；b.上升速率为6×10^-6 m/s(0.52 m/d，84.9 d)；c.上升速率为9×10^-6 m/s(0.78 m/d，56.6 d)

Figure 10. Changes of groundwater level with different reservoir water level rising rates

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图 11 不同库水位下降速率时滑坡体内地下水位的变化

a.下降升速率为3×10^-6 m/s(0.26 m/d，169.8 d); b.下降速率为6×10^-6 m/s(0.52 m/d，84.9 d); c.下降速率为9×10^-6 m/s(0.78 m/d，56.6 d)

Figure 11. Changes of groundwater level with different reservoir water level dropping rates

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图 12 不同库水位升降速率时的稳定系数

a.库水位上升；b.库水位下降

Figure 12. Stability factors with different water level fluctuation rates

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图 13 2019年汛期GPS位移监测与库水位变化和降雨量关系(GPS监测始于2019年初)

Figure 13. Relationship between GPS displacement monitoring and water level and rainfall in 2019 flood season

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图 14 2019年汛期前后坡体渗流场及稳定系数

Figure 14. Seepage field and stability factors of the slope in 2019 flood season

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图 15 2019年汛期稳定系数与实测地下水位

Figure 15. Slope stability factors and the monitoring groundwater level in 2019 flood season

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表 1 东岭信滑坡堆积体岩土体参数取值

Table 1. Parameters of rock and soil mass of Donglingxin landslide deposit

岩土分类	天然重度/(kN·m^-3)	饱和重度/(kN·m^-3)	渗透系数/(m·s^-1)	抗剪强度		饱和体积含水率/%
岩土分类	天然重度/(kN·m^-3)	饱和重度/(kN·m^-3)	渗透系数/(m·s^-1)	c/kPa	φ/(°)	饱和体积含水率/%
滑体	22.0	22.5	1×10^-4	80	33.0	22
滑带	20.3	20.8	3×10^-5	23	29.4	34
基岩	26.8	27.6	1×10^-9	2 000	45.0	-

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