摘要
如何判定连阴雨条件下岩土体的稳定性是黄土地区工程设计尚未解决的一大难题,而其关键是土体含水率的演化规律。基于西安市近35 a降雨资料,根据地区降雨的统计特征,利用皮尔逊Ⅲ型曲线,构建了考虑水文因素的特定地区的连阴雨边界;在此基础上,基于非饱和土渗流数值模拟开展不同降雨边界条件、工程条件对黄土地基降雨入渗规律影响研究。具体结论如下:①百年一遇连阴雨作用下,地基表层出现了暂态饱和区,其他3种重现期未出现暂饱和区;②降雨入渗对地基稳定性的影响不仅发生在降雨过程中,降雨停止后一定时间内,水分会继续入渗,对地基的稳定性持续造成危害;③随着地基处理宽度、深度增大地基含水率增速变慢、增量变小。
Prediction of the stability of rock and soil of loess area during continuous rain is a big problem to be solved in the engineering design,and the key is to study the evolution law of soil moisture content.Based on the rainfall data of Xi'an in the past 35 years,according to the definition of continuous rain,using the Pearson III curve,the boundary conditions of continuous rain considering hydrological factors were constructed.On this basis,the effects of different boundary conditions,soil conditions and engineering conditions on rainfall infiltration laws of loess foundation are studied.The specific conclusions are as follows:①Under the action of continuous rain in the past 100 years,the transient saturation zone appears on the surface of the foundation,and the temporary saturation zone does not appear in the other three reproduction periods.②The influence of rainfall infiltration on the stability of the foundation not only occurs during the rainfall process,but also the water will continue to infiltrate within a certain period of time after the rainfall stops,which will continue to cause damage to the stability of the foundation.③As the treatment width and depth of foundation increases,the water content in the foundation increases at a slower rate and a smaller increment.
作者
高徐军
曹嘉臻
岳黎斌
GAO Xujun;CAO Jiazhen;YUE Libin(Power China Northwest Engineering Corporation Limited,Xi'an 710065,China;Xi'an University of Technology, Xi'an 710048,China)
出处
《西北水电》
2020年第5期33-37,共5页
Northwest Hydropower
关键词
黄土地基
降雨入渗
皮尔逊Ⅲ型曲线
连阴雨
loess foundation
rainfall infiltration
Pearson III curve
continuous rain
