渗透变形过程中临空面表层土体渗透特性变化试验研究

发布时间：2018-02-08 20:55

  本文关键词： 堤基管涌 松散层 渗透特性 试验研究　出处：《岩土力学》2017年09期 　论文类型：期刊论文

【摘要】：在堤基管涌发展机制的研究中,需考虑管涌通道四周破坏扰动松散层的影响。目前针对松散层渗透特性变化的定量试验数据较少。基于此,通过一维垂直向上渗流作用下均匀砂的渗透试验来研究临空面表层土体的松散过程和渗透特性变化情况。砂样垂向渗透变形发展过程中伴随着临空面表层土体松散破坏和松散层逐渐向深部扩展的过程。通过分析砂样沿程水头分布的调整变化情况得知,松散表层土体的渗透系数分布呈突变形式,即临空面松散薄层的渗透系数远大于其下松散砂层的渗透系数。由此类推,管涌通道边壁四周松散薄层的渗透系数远大于砂样整体渗透系数,松散层的存在使得管涌通道尖端坡降并不会达到很大值。这一点认识对管涌发展机制的研究至关重要。
[Abstract]:In the study of the mechanism of foundation piping development, it is necessary to consider the influence of the destruction of disturbed loose layer around the piping passage. At present, there are few quantitative experimental data on the change of permeability characteristics of the loose layer. The loose process and the change of permeability characteristics of the surface soil are studied by the permeation test of uniform sand under the action of one dimensional vertical upward seepage. The development of vertical seepage deformation of sand sample is accompanied by the looseness of the surface soil on the face of the goaf. Through the analysis of the adjustment and variation of the distribution of sand samples along the water head, it is known that, The distribution of permeability coefficient of loose surface soil is a sudden change, that is, the permeability coefficient of loose thin layer is much larger than that of loose sand layer. The permeability coefficient of the loose thin layer around the side wall of the pipeline is much larger than that of the sand sample as a whole, and the existence of the loose layer makes the slope gradient at the tip of the pipeline not to reach a large value, which is very important to the study of the mechanism of pipeline development.
【作者单位】： 华南理工大学土木与交通学院;华南理工大学亚热带建筑科学国家重点实验室;
【基金】：国家科技支撑计划资助项目(No.2011BAG07B02) 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室资助课题(No.Z015013)~~
【分类号】：TV223
，

本文编号：1496251