| 三峡库区泄滩滑坡非饱和渗流分析及渗透系数反演 |
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| 引用本文： | 魏进兵,邓建辉,高春玉,谭国焕,李焯芬.三峡库区泄滩滑坡非饱和渗流分析及渗透系数反演[J].岩土力学,2008,29(8):2262-2266. |
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| 作者姓名： | 魏进兵 邓建辉 高春玉 谭国焕 李焯芬 |
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| 作者单位： | 1. 四川大学,水利水电学院/水力学与山区河流开发保护国家重点实验室,成都,610065
2. 香港大学,土木工程系,香港 |
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| 基金项目： | 973项目
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中国博士后科学基金
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香港RGC基金 |
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| 摘 要： | 泄滩滑坡的水文地质结构比较复杂,滑体、滑带及滑动影响带为多孔连续介质,透水层基岩为裂隙介质.采用等效连续介质模型模拟裂隙岩体,建立了泄滩滑坡饱和-非饱和渗流的有限元计算模型.然后采用BP网络对非饱和有限元渗流计算进行了模拟,并根据蓄水期水库水位及滑坡体地下水位监测资料,采用遗传算法对泄滩滑坡各地层渗透系数进行了反演.反演的滑体饱和渗透系数为4.89×10-2 cm/s,与现场原位试验值1.78×10-2 3.2×10-2 cm/s相当;反演的滑带饱和渗透系数为4.66×10-5 cm/s,远比室内试验值2.74×10-7 5.73×10-7 cm/s大.这种差异在一定程度上反映了土体参数的尺度效应.
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| 关 键 词： | 非饱和渗流 渗透系数 BP网络 遗传算法 泄滩滑坡 |
| 收稿时间： | 2007-03-06 |
Unsaturated seepage analysis and back analysis of permeability coefficient for Xietan landslide in Three Gorges Reservoir area |
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| WEI Jin-bing,DENG Jian-hui,GAO Chun-yu,THAM L. G.,LEE C. F..Unsaturated seepage analysis and back analysis of permeability coefficient for Xietan landslide in Three Gorges Reservoir area[J].Rock and Soil Mechanics,2008,29(8):2262-2266. |
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| Authors: | WEI Jin-bing DENG Jian-hui GAO Chun-yu THAM L G LEE C F |
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| Institution: | 1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China; 2. Department of Civil Engineering, the University of Hong Kong, Hong Kong, China |
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| Abstract: | The hydrogeological structure of Xietan landslide is very complex; its slidebody, slipband and sliding-disturbed zone can be regarded as porous continuous medium, but its infiltrative bedrock is fractured. An equivalent continuum model is used to model fractured rock; and a finite element model of saturated-unsaturated seepage analysis of Xietan landslide is established. Then back-propagation neural network is used to substitute finite element seepage analysis; and saturated permeability coefficient of every stratum is optimized by genetic algorithm based on monitoring data during reservoir filling. The saturated permeability coefficient of slidebody by back analysis is 4.89×10-2 cm/s, which is consistent with field testing result(1.78?10?2 cm/s to 3.2×10?2 cm/s); the saturated permeability coefficient of slipband by back analysis is 4.66×10?5 cm/s, which is very larger than indoor testing result (2.74×10?7 cm/s to 5.73×10?7 cm/s). The scale effect of soil sample is reflected by this difference. |
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| Keywords: | unsaturated seepage permeability coefficient back-propagation neural network genetic algorithm Xietan landslide |
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