摘要
为揭示库水位涨落条件对挡土墙坡体渗流特性的影响,基于饱和-非饱和渗流理论,采用有限元软件,分析库水位变化条件下挡土墙坡体的渗流特征。结果表明:库水位涨落的速率越大,墙后黏性土坡体比砂性土坡体的水位滞后于库水位的现象越明显;库水位骤升初期,近挡土墙坡体孔压等值线为斜率小于0的凹曲线,离挡土墙越近,孔压等值线的斜率绝对值越大,远离挡土墙,孔压等值线趋于直线;库水位骤变条件下,挡土墙墙后黏性坡体相比于砂性土坡体的孔压变化范围更小,当涨落速率为2 m/d时,挡土墙渗流时间最短,坡体孔压最快趋于稳定状态;库水位涨落条件下,挡土墙墙后附近浸润线呈曲线分布,远离挡土墙的浸润线呈直线分布,饱和渗透系数越小,浸润线曲线分布的范围增大约2倍。
In order to reveal the influence of reservoir water level fluctuation conditions on the seepage characteristics of the retaining wall slope,based on the saturationunsaturated seepage theory,finite element technology was used to analyze the seepage characteristics of the retaining wall slope under the condition of changing reservoir water level.The results show that the water level of the viscous soil slope behind the wall lags behind the water level of the reservoir more obviously than that of the sandy soil slope.In the early stage of sudden rise of reservoir water level,the pore pressure contour line near the retaining wall is a concave curve with a slope less than zero.The closer to the retaining wall,the larger the slope absolute value of the pore pressure contour line is.When the reservoir water level changes abruptly,the pore pressure of the viscous slope behind the retaining wall changes less than that of the sandy soil slope.When the fluctuation rate is 2 m/d,the seepage time of the retaining wall is the shortest,and the pore pressure of the slope body tends to the stable state the fastest.When the reservoir water level fluctuates,the saturation line near the retaining wall is in a curve distribution,while the saturation line far away from the retaining wall is in a straight line distribution.The smaller the saturation permeability coefficient is,the larger the distribution range of the saturation line is,and the curve distribution range increases by about 2 times.
作者
庄燕珍
ZHUANG Yanzhen(Sanming Communications Construction Development Group Co.,Ltd.,Sanming,Fujian 365099,China)
出处
《水利与建筑工程学报》
2024年第2期32-39,65,共9页
Journal of Water Resources and Architectural Engineering
基金
福建省住房和城乡建设行业科技项目(2022-K-319)。
关键词
库水位涨落
数值模拟
挡土墙
渗流特征
reservoir water level fluctuation
numerical simulation
retaining wall
seepage characteristics
