基于滑体渗透性与库水变动的滑坡变形滞后规律研究

刘艺梁; 唐玄; 许方党; 宋琨; 陈健翔; 薛欣; 高晨曦; 易庆林

doi:10.19509/j.cnki.dzkq.2022.0205

基于滑体渗透性与库水变动的滑坡变形滞后规律研究

doi: 10.19509/j.cnki.dzkq.2022.0205

刘艺梁^{1, 2,},
唐玄^{1, 2, ,},
许方党³,
宋琨^{1, 2},
陈健翔^{1, 2},
薛欣^{1, 2},
高晨曦^{1, 2},
易庆林^{1, 2}

1.
三峡库区地质灾害教育部重点实验室, 湖北宜昌 443002
2.
三峡大学土木与建筑学院, 湖北宜昌 443002
3.
浙江省第十一地质大队, 浙江温州 325006

基金项目:

国家自然科学基金项目 41807294

湖北省自然科学基金项目 2018CFB400

详细信息

作者简介:
刘艺梁(1985-), 男, 讲师, 主要从事滑坡灾害演化机理与防控研究。E-mail: lyl@ctgu.edu.cn

通讯作者:
唐玄(1998-), 男, 主要从事库岸滑坡演化机理及预测预报研究。E-mail: 3027984327@qq.com

中图分类号: P642.22
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- 文章访问数: 920
- PDF下载量: 75
- 被引次数: 0
出版历程
- 收稿日期: 2022-05-16

Landslide deformation hysteresis regularity based on permeability of landslide and reservoir water change

Liu Yiliang^{1, 2
,},
Tang Xuan^{1, 2
, ,},
Xu Fangdang³,
Song Kun^{1, 2},
Chen Jianxiang^{1, 2},
Xue Xin^{1, 2},
Gao Chenxi^{1, 2},
Yi Qinglin^{1, 2}

1.
Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, Yichang Hubei 443002, China
2.
College of Civil Engineering & Architecture, China Three Gorges University, Yichang Hubei 443002, China
3.
11th Geological Team of Zhejiang Province, Wenzhou Zhejiang 325006, China

摘要

摘要:
三峡水库运行过程中库岸滑坡的变形演化往往滞后于库水位的变化, 表现出时间滞后效应, 而且随渗透系数和库水位波动速率的不同, 滞后效应亦不同。以三峡库区白家包滑坡为例, 通过现场调查、监测数据分析以及数值模拟的方法, 研究了滑坡在不同渗透系数k和不同库水位下降速率v条件下的变形滞后时间变化规律。研究表明: 滑体渗透系数一定时, 库水位下降速率越大, 地下水滞后越明显; 库水位下降速率一定时, 滑体渗透系数越大, 地下水下降越快。当滑体渗透系数一定时, 库水位下降速率越大, 滑坡的变形滞后时间越短; 滑体渗透系数k=0.85 m/d时不同库水位下降速率作用下滑坡的变形滞后时间为3.74~9 d, 当0.47＜v/k＜1.18时, 0.24＜相对变形滞后时间＜1;当1.18＜v/k＜2.38时, 0＜相对变形滞后时间＜0.24。当库水位下降速率一定时, 滑体渗透系数越大, 滑坡变形滞后时间越短, 不同库水位下降速率下滑坡变形滞后时间随渗透系数的变化规律大致相同; 库水位下降速率v=1.8 m/d时不同滑体渗透系数下滑坡的变形滞后时间为1.7~8 d, 当0.52＜v/k＜0.84时, 0＜相对变形滞后时间＜0.16;当0.84＜v/k＜2.12时, 0.16＜相对变形滞后时间＜0.43;当2.12＜v/k＜9时, 0.43＜相对变形滞后时间＜1。研究成果对水库滑坡预测预警具有较强的应用价值。
- 水库滑坡 /
- 库水位下降速率 /
- 渗透系数 /
- 滑坡变形 /
- 滞后效应
Abstract:
The deformation evolution of reservoir landslides of ten lags behind the variation in the reservoir water level during the operation of the Three Gorges Project, showing a deformation hysteresis effect, and the hysteresis effect is different with the difference in the permeability coefficient and fluctuation rate of reservoir water. Taking the Baijiabao landslide in the Three Gorges Reservoir area as an example, the variation law of the deformation lag time under different permeability coefficients k and reservoir water level decline rates v is studied by field investigation, monitoring data analysis and numerical simulation. The results show that when the permeability coefficient of the landslide is constant, the higher the decreasing rate of reservoir water level is, the more obvious the groundwater lag. When the reservoir water level drops at a certain rate, the greater the permeability coefficient of the sliding body is, the faster the groundwater drop.When the permeability coefficient of the sliding body is 0.85 m/d, the higher the rate of reservoir water level decline is, the shorter the deformation lag time of the landslide.The corresponding lag time is 3.74-9 d under different decline rates of the reservoir water level.When 0.47 < v/k < 1.18, 0.24 < relative deformation lag time < 1; when 1.18 < v/k < 2.38, 0 < relative deformation lag time < 0.24. When the reservoir water level decline rate is constant, the larger the landslide permeability coefficient is, the shorter the landslide deformation lag time is. Under different reservoir water level decline rates, the change rule of the relative deformation lag time with increasing v/k value is roughly the same, v=1.8 m/d, and the corresponding lag time of different permeability coefficients is 1.7-8 d. When 0.52 < v/k < 0.84, 0 < relative deformation lag time < 0.16; when 0.84 < v/k < 2.12, 0.16 < relative deformation lag time < 0.43; when 2.12 < v/k < 9, 0.43 < relative deformation lag time < 1. The research results have strong application value for the prediction and warning of reservoir landslides.
- reservoir landslide /
- decreasing rate of reservoir water /
- permeability coefficient /
- landslide deformation /
- hysteresis effect

HTML全文

图 1 白家包滑坡工程地质平面图

Figure 1. Engineering geological plan of the Baijiabao landslide

下载: 全尺寸图片幻灯片

图 2 白家包滑坡工程地质剖面图

Figure 2. Engineering geological profile of the Baijiabao landslide

下载: 全尺寸图片幻灯片

图 3 滑坡GPS监测点累计位移-库水位-降雨量-时间关系曲线

Figure 3. Curves of accumulative displacement, reservoir water level, rainfall and time of landslide at GPS monitoring point

下载: 全尺寸图片幻灯片

图 4 滑坡自动监测点累计位移-库水位-日降雨量-时间关系曲线

Figure 4. Curves of accumulative displacement, reservoir water level, daily rainfall and time relationship of landslide at automatic monitoring point

下载: 全尺寸图片幻灯片

图 5 白家包滑坡数值模型

Figure 5. Numerical model of the Baijiabao landslide

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图 6 白家包滑坡滑体渗透系数为0.85 m/d时的渗流场稳态云图

Figure 6. Steady-state cloud image of seepage field with a permeability coefficient of 0.85 m/d of the Baijiabao landslide

下载: 全尺寸图片幻灯片

图 7 ZD3监测点实际位移与模拟位移对比图

Figure 7. Comparison diagram of actual displacement and simulated displacement at ZD3 monitoring point

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图 8 库水位下降速率统计图

Figure 8. Statistical diagram of the reservoir water level decreasing rate

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图 9 不同库水位下降速率下滑坡变形滞后时间曲线图

Figure 9. Time lag of the relative deformation under different decreasing rates of the reservoir water level

下载: 全尺寸图片幻灯片

图 10 渗透系数一定时不同库水位下降速率和渗透系数比率下的相对变形滞后时间

Figure 10. Time lag of the relative deformation under ratios of different decreasing rates of reservoir water level to permeability coefficient

下载: 全尺寸图片幻灯片

图 11 不同库水位下降速率和渗透系数下滑坡变形滞后时间曲线图

Figure 11. Time lag curve of landslide deformation under different decreasing rates of the reservoir water level and permeability coefficient

下载: 全尺寸图片幻灯片

图 12 不同库水位下降速率和渗透系数比率下的相对变形滞后时间

Figure 12. Time lay curve of relative deformation under ratios of different decreasing rates of the reservoir wate level to the pemeability coefficient

下载: 全尺寸图片幻灯片

表 1 白家包滑坡数值模拟参数

Table 1. Parameters of numerical model of the Baijiabao landslide

参数名称	滑体	滑带	滑床
含水量w_B/%	20.7	15.8
弹性模量/MPa	15.4	8.1	6.6×10⁴
泊松比	0.25	0.44	0.24
黏聚力/kPa	17.1	26.8	1 200
内摩擦角/(°)	21.4	18.6	32.3
容重/(kN·m^-3)	18.0	21.3	24.3

下载: 导出CSV

表 2 不同滑体渗透系数的模拟工况

Table 2. Simulated permeability coefficients for the different sliding bodies

工况序号	库水位下降速率/(m·d^-1)	渗透系数/(m·d^-1)
1	0.6	0.2, 0.85, 1.5, 2.15, 2.8, 3.45
2	1.2	0.2, 0.85, 1.5, 2.15, 2.8, 3.45
3	1.8	0.2, 0.85, 1.5, 2.15, 2.8, 3.45

下载: 导出CSV

表 3 不同库水位下降速率和渗透系数下滑坡变形滞后时间变化

Table 3. Time lag table of landslide deformation under different decreasing rates of the reservoir water level and permeability coefficient

渗透系数变化区间/(m·d^-1)	库水位下降速率/(m·d^-1)	滞后时间/d
渗透系数变化区间/(m·d^-1)	库水位下降速率/(m·d^-1)	最小值	最大值
(0.20, 0.85)	0.6	8	13
	1.2	6	10.5
	1.8	4.42	8
(0.85, 2.15)	0.6	4	8
	1.2	3.5	6
	1.8	2.72	4.42
(2.15, 3.45)	0.6	3	4
	1.2	2.5	3.5
	1.8	1.7	2.72

下载: 导出CSV

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