摘要
泥岩作为一种水敏性较强的填料,其渗透特性变化严重制约着工程结构的安全。采用对照试验方式,设计5个级配梯度,通过自主设计渗透试验仪对泥岩填料进行渗透变形破坏试验,对比泥岩填料击实破碎分形变化特征,分析填料渗透性与级配结构的相关性。结果表明,击实前后填料级配由不良变为良好,分形维数由2.23~2.51增至2.44~2.57,分形曲线分布特征与粒径累计曲线变化特征一致,分形维数可作为评价级配特征的量化指标;不同试样的渗透系数具有相同数量级(10cm/s),仅数值有所差异,部分试样发生渗流破坏;分形维数与渗透系数具有二次项函数关系,渗透系数峰值点及其相近邻域对应维数(维度2.525)的试样易发生渗流破坏。
Mudstone, as a kind of filler with strong water sensitivity, its permeability changes seriously restricts the safety of engineering structures. In this paper, five gradation gradients were designed in the form of control test. The permeability deformation and failure test of mudstone filler was carried out by independently designed permeability tester. Fractal change characteristics of compaction and breakage of mudstone filler were compared, and the correlation between permeability of filler and gradation structure was analyzed. The results show that the grading of packing changes from bad to good before and after compaction, and the fractal dimension increases from 2.23-2.51 to 2.44-2.57. The distribution characteristics of fractal curve are consistent with the change characteristics of particle size cumulative curve, and the fractal dimension can be used as a quantitative index to evaluate the grading characteristics. The permeability coefficient of different samples has the same order of magnitude of 10cm/s, and only the values are different, and some samples have seepage failure. The fractal dimension has a quadratic function relation with permeability coefficient, and the sample with the peak point of permeability coefficient and its corresponding dimension(dimension 2.525) is prone to seepage failure.
作者
李文杰
LI Wen-jie(Xinjiang Railway Survey and Design Institute Co.,LTD.,Urumqi 83001l,China)
出处
《水电能源科学》
北大核心
2022年第10期173-177,共5页
Water Resources and Power
关键词
泥岩填料
分形维数
颗粒级配
渗透特性
mudstone filling
fractal dimension
particle size distribution
infiltration characteristics
作者简介
李文杰(1989-),男,硕士、工程师,研究方向为地质工程及岩土体稳定评价,E-mail:544368910@qq.com。
