【作者】 武彩霞； 戴福初； 闵弘； 涂新斌； 邝国麟； 周跃峰；

【Author】 WU Cai-xia~1,DAI Fu-chu~1,MIN Hong~2,TU Xin-bin~1,Kwong,A.K.L.~3,ZHOU Yue-feng~3 1.Institute of Geology and Geopysics,Chinese Academy of Sciences,Beijing 100029,China 2.Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China 3.Department of Civil Engineering,University of Hong Kong,Hong Kong 999077,China

【机构】 中国科学院地质与地球物理研究所； 中国科学院岩土力学研究所； 香港大学土木工程学系；

【摘要】 针对黑方台黄土滑坡.从现场灌溉试验监测数据和数值模拟分析着手.研究灌溉过程中台塬斜坡的水文响应以及对黄土斜坡稳定性的影响结果表明.短期的灌溉并不能对地下水位形成有效的补给但是却容易引起斜坡浅部范围内体积含水量增加.从而使得抗剪强度降低.最终在台缘顶部发生滑塌.台塬顶部裂缝的存在会使得浅部体积含水量增加速度加快加速土体弱化更易发生台塬顶部的滑塌.从长期灌溉模拟来看.裂缝的存在会加速地下水位的上升从数据上论证了黄土斜坡受裂缝的影响特性.为研究黄土滑坡与地表水入渗的关系提供数据参考此外数值模拟与监测数据有很好的对应关系用其模拟灌溉引起的斜坡水文响应是可行的更多还原

【Abstract】 A field irrigation experiment has been made in an instrumented loess landslide of Heifangtai.Hydrological response and its effect on loess slope are analyzed based on monitoring data and numerical modelling.The result indicates that the groundwater table cannot be enhanced by short-term irrigation.However,the volumetric water content at shallow depths of the slopes increased rapidly, reducing the shear strength of loess and resulting in shallow failure at the margin of the platform.The cracks at the margin of the platform could increase the rate of infiltration.Numerical modeling of long-term irrigation indicates that cracks arc favorable for rise of groundwater table.It is justified from the data the significance of loess slope affected by cracks.In addition,the numerical modeling results are consistent with the monitoring data,showing the numerical method can be used to simulate the hydrological response of the monitored site caused by irrigation.更多还原