长江水位下降及降雨条件下荆江河段岸坡渗流特性研究

发布时间：2018-05-27 02:32

本文选题：降雨 + 长江水位下降　；参考：《水电能源科学》2016年06期

【摘要】：为了研究荆江河段岸坡土体的渗流特性及失稳机理,对荆江中州子护岸工程段河岸土样做了渗透系数和土水特征曲线室内试验,并基于Van Genuchten模型对土水曲线的试验结果进行拟合。在获得土体水力参数的基础上,根据该河段岸坡二元结构土体的特点,基于饱和—非饱和渗流理论,探讨了水位下降及降雨条件下岸坡不同粘性土层厚度对岸坡渗流场的影响规律。结果表明,地下水的下降速率随粘性土层厚度的增加而减少;粉质粘土层厚度越大,降雨对岸坡孔压场的影响范围也越大,且在一定程度上增大了土体的暂态饱和区,不利于岸坡的稳定性。
[Abstract]:In order to study the seepage characteristics and instability mechanism of soil on the bank slope of Jingjiang River reach, the permeability coefficient and soil-water characteristic curve of riverbank soil samples in Zhongzhou bank revetment engineering section of Jingjiang River were tested in laboratory. The experimental results of soil and water curves are fitted based on Van Genuchten model. On the basis of obtaining hydraulic parameters of soil, according to the characteristics of the soil with dual structure on the bank slope of the river, the theory of saturated-unsaturated seepage flow is used. The influence of different thickness of cohesive soil layer on seepage field of bank slope under the condition of falling water level and rainfall is discussed. The results show that the decreasing rate of groundwater decreases with the increase of the thickness of the clay layer, and the larger the thickness of silty clay layer, the greater the influence of rainfall on the pore pressure field on the bank slope, and to a certain extent, the transient saturated area of soil is enlarged. It is bad for the stability of bank slope.
【作者单位】：河海大学港口海岸与近海工程学院;长江南京航道工程局;
【分类号】：TV223.4

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