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。
In order to study the seepage characteristics and mechanism of bank slope stability in the Jingjiang River,soil samples were taken in revetment engineering section of Jingjiang Zhongzhouzi and used for the coefficient of permeability test and the soil water characteristics curve indoor test.And the test results of soil water characteristic curve were used for curve fitting based on Van Genuchten model.According to the features of dual soil structures in Jingjiang River,based on saturated-unsaturated seepage theory,the influence of different thickness of silty clay layer on slope seepage under the condition of water level descent and rainfall was investigated.The analysis results show that the decline rate of groundwater level decrease as silty clay layer thickness increase.The greater the silty clay layer thickness is,the larger the extent of the influence of rainfall on pore-water pressure field is.The transient saturated zone become larger as the silty clay layer thickness is greater,which is not conducive to slope stability.
出处
《水电能源科学》
北大核心
2016年第6期119-122,共4页
Water Resources and Power
关键词
降雨
长江水位下降
粘性土层厚度
岸坡渗流特性
非饱和土
土水特征曲线
rainfall
water level descent of Yangtze River
silty clay layer thickness
slope seepage characteristics
unsaturated soil
soil water characteristic curve
