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融雪入渗条件下边坡渗流计算及稳定性分析

期刊名称：中国地质灾害与防治学报,2010,Vol 21(4): 27(33.
时间：0
分类：P642[天文地球—工程地质学;天文地球—地质矿产勘探;天文地球—地质学] TU441.35[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072
相关基金：国家自然科学基金（50979081 50879063）; 国家重点基础研究发展计划（2010CB732005）
相关项目：岩体结构面全应力应变过程水力耦合机理研究

关键词：融雪入渗, 非饱和渗流, 积雪深度, 气温, 坡度, 边坡稳定性分析, snowmelt infiltration, unsaturated seepage, snow depth, air temperature, slope angle, analysis of slope sta-bility

中文摘要：

本文利用饱和非饱和渗流有限元方法,参考积雪厚度、温度变化与融雪入渗关系统计资料,对积雪深度、气温变化以及坡度等不同条件进行了边坡融雪入渗渗流计算及稳定性分析。本文条件下计算结果表明：同一坡度下融雪入渗系数和坡面一定范围内的含水量及压力水头随积雪深度增加而增加,积雪深度达1.0m时,融雪入渗垂直影响范围为30.0m,边坡暂态饱和水位升高13m;相同积雪深度条件下,坡度越大,融雪入渗系数越小,坡内压力水头及含水量变化越小,30°边坡融雪入渗垂直影响范围最大为30.0m;同一积雪深度和坡度下,融雪入渗系数及坡面附近压力水头均与气温变化幅度呈正相关关系。根据极限平衡计算,边坡的稳定系数随着融雪过程的持续而降低,积雪深度、边坡坡度或温度变化越大,安全系数降低幅度越大;其中,坡度因子对边坡安全系数的影响最为显著,60°边坡受融雪影响安全系数降幅达9.7%。

英文摘要：

In this paper,with reference to the statistics of relations of snow depth,temperature variation and snowmelt infiltration,the seepage field and stability under the different conditions of snow depth,temperature variation and slope angle are obtained by the method of FEM in unsaturated seepage.The results are summarized as follows： as to slopes of the same ratio,snowmelt infiltration coefficient,water content as well as pressure head within a certain range of the slope will increase with the rising of the snow depth.In cases that the snow depth is 1.0m,the vertical infiltration extent of snowmelt is up to 30.0m and the transient saturation water level of the slope rises as high as 13m;Under the same snow depth,the steeper the slope is,the less the snowmelt will infiltrate,the change of pressure head and water content of the slope will also be lessed.In addition,the vertical extent of snowmelt infiltration when the slope angle is 30° reaches 30.0m at the maximum point;Under the same snow depth and slope angle,snowmelt infiltration and head pressure are in positive correlation to temperature changes;As to the slope safety,stability coefficient decreases with the continuous melting of snow,and the more the snow depth,slope angle or temperature variation is,the sharper the amplitude of stability coefficient will reduce.Moreover,the slope angle is the factor which affects the slope safety most significantly,60° slope stability coefficient decreases by 9.7% when affected by the snowmelt infiltration.

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