摘要
针对降雨过程中裂隙对膨胀土边坡内部渗流的影响问题,尝试在前人研究的基础上,提出将边坡由表面向深部依次划分为两个亚层:裂隙影响层和原始层,来反映裂隙状态下边坡的工作状态的简化方法.通过现场与室内试验相结合来确定各亚层非饱和土体参数,并对各亚层的深度进行了研究确定,然后根据前人所进行的膨胀土边坡现场降雨试验实例,采用MIDAS/GTS有限元分析软件,对降雨过程中边坡内部孔隙水压力的分布规律进行模拟分析.结果显示提出方法得出的孔隙水压力与现场实测结果基本一致,并且能够反映裂隙膨胀土边坡相对于无裂隙边坡渗流速度快,在两亚层接触区域存在滞水现象等特点.
To cope with the problem that the influence caused by fissures on internal seepage of expansive soil slope in rainfall process, on the basis of previous studies, a new method was put forward to try to re- flect the work state of expansive soil slope by dividing the slope into two layers fissure influence layer and the original layer. The field and laboratory tests are used in combination to determine the layer of unsaturat- ed soil parameters, and the depth sub layer was also identified, then according to the expansive soil slope field rainfall test examples, the internal seepage of expansive soil slope in rainfall process was analyzed using MIDAS / GTS finite element analysis software. The results showed that the pore water pressure got by the proposed method were consistent with the field measured data, the fact that seepage speed in fissures expan- sive soil slope is faster than slope without fissures and the backwater phenomenon between two layer contact area can also be reflected.
出处
《湘潭大学自然科学学报》
CAS
CSCD
北大核心
2012年第3期30-37,共8页
Natural Science Journal of Xiangtan University
基金
国家自然科学基金项目(50974078
51174124)
关键词
膨胀土
裂隙
降雨
渗流
expansive soil
fissure
rainfall
seepage
