| 库水升降条件下考虑饱和渗透系数空间变异性的白水河滑坡渗流变形分析 |
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| 引用本文： | 薛阳,吴益平,苗发盛,李麟玮,廖康,张龙飞.库水升降条件下考虑饱和渗透系数空间变异性的白水河滑坡渗流变形分析[J].岩土力学,2020,41(5):1709-1720. |
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| 作者姓名： | 薛阳 吴益平 苗发盛 李麟玮 廖康 张龙飞 |
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| 作者单位： | 中国地质大学（武汉） 工程学院，湖北 武汉 430074 |
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| 基金项目： | 国家自然科学基金资助项目（No. 41977244, No. 41572278）；国家重点研发计划（No. 2017YFC1501301）。 |
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| 摘 要： | 堆积层滑坡的岩土体渗透系数具有一定的不确定性，且渗透系数是饱和-非饱和渗流分析的重要参数，开展考虑其空间变异性的库岸堆积层滑坡渗流变形分析具有重要意义。以三峡库区中的白水河滑坡为研究对象，基于地面核磁共振技术获取的岩土体渗透系数，分析滑坡体渗透系数的空间变异特征，采用半变异函数方法求得滑坡体渗透系数的竖直波动范围，在此基础上建立渗透系数的非平稳随机场模型。以非侵入式随机有限元的方式开展库水升降两种工况下不确定模型与确定模型的流固耦合模拟，分析两种模型的渗流场、位移变形特征及其差异。结果表明：相比于确定模型，不确定模型孔压改变的滞后性更为明显，且库水下降工况下整体的变形更大，若忽略滑体渗透系数的非平稳空间变异特征将会低估滑坡的实际变形。
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| 关 键 词： | 空间变异性 饱和渗透系数 库水升降 非饱和流固耦合 非侵入式随机有限元法 |
| 收稿时间： | 2019-05-18 |
| 修稿时间： | 2019-09-09 |
Seepage and deformation analysis of Baishuihe landslide considering
spatial variability of saturated hydraulic conductivity
under reservoir water level fluctuation |
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| XUE Yang,WU Yi-ping,MIAO Fa-sheng,LI Lin-wei,LIAO Kang,ZHANG Long-fei.Seepage and deformation analysis of Baishuihe landslide considering
spatial variability of saturated hydraulic conductivity
under reservoir water level fluctuation[J].Rock and Soil Mechanics,2020,41(5):1709-1720. |
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| Authors: | XUE Yang WU Yi-ping MIAO Fa-sheng LI Lin-wei LIAO Kang ZHANG Long-fei |
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| Institution: | Engineering Faculty, China University of Geosciences, Wuhan, Hubei 430074, China |
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| Abstract: | The saturated hydraulic conductivity of rock and soil mass in colluvial landslide is uncertain, and it is an important parameter for the saturated-unsaturated seepage analysis. It is of great significance to carry out the seepage deformation analysis of reservoir bank landslide considering the spatial variability of saturated hydraulic conductivity. In this study, the Baishuihe landslide in the Three Gorges Reservoir Area is investigated as a case. The spatial variability characteristics of the hydraulic conductivity, which is obtained by the surface nuclear magnetic resonance technology (SNMR), are analyzed in detail. The vertical fluctuation range of the hydraulic conductivity is obtained by using the semi-variation function, and a non-stationary random field model of hydraulic conductivity is established. The non-intrusive stochastic finite element method is adopted to carry out the fluid-solid coupling simulation of the uncertain model and the deterministic model under the two working conditions of reservoir water level fluctuation. The seepage field, deformation characteristics and their differences between the two models are analyzed. The results show that, compared with the determinate model, the hysteresis of pore pressure change in the uncertain model is more obvious, and the overall deformation is greater under the condition of reservoir water falling. If the non-stationary spatial variation of the hydraulic conductivity of the sliding body is neglected, the actual deformation of the landslide will be underestimated. |
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| Keywords: | spatial variability saturated hydraulic conductivity reservoir water level fluctuation unsaturated seepage-stress coupling non-intrusive stochastic finite element method |
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