摘要
针对泥质岩遇水易发生崩解的特点,采用自行设计的试验装置模拟自然界中降雨的实际环境,将泥质岩制成不同块度的试样,开展了干湿循环作用下的室内崩解试验研究。结果表明,随着循环次数的增加,不同粒径百分含量关系曲线呈现出不断减小、先增大后减小及不断增大3种变化趋势。分析了泥质岩矿物组成对其崩解特性的影响,采用优化级配方程描述了泥质岩崩解物的级配曲线,其相关系数都在0.98以上,且曲线与试验散点非常接近,验证了优化级配方程对泥质岩崩解物级配描述的适用性。推导了基于优化级配方程的相对耐崩解性指数,并与试验结果对比,分析表明两者非常接近,从而验证了推导模型的正确性。随着试样块度的不断增大,其耐崩解性指数与相对耐崩解性指数均不断减小。
Mudstone is easy to disintegrate when encounters water.A self-designed test device was used to simulate the actual environment of rainfall in the natural environment,and four different lumpiness samples were prepared for the mudstone.Experimental study on indoor disintegration under cyclic action is carried out.The results demonstrate that the relationships between percentage of each group and cycle number of mudstone disintegration show three trends.That is,as the cycle numbers increases,the percentage of different particle groups decreases,increases first and then decreases,and increases,respectively.Moreover,the influence of the mineral composition of mudstone on its disintegration characteristics is analyzed.The gradation curve of mudstone disintegration is described by the optimized grading equation.The correlation coefficient is above 0.98,and the curve is very close to the experimental scatter.The applicability of the optimized grading equation to the grading description of mudstone disintegration is verified.Besides,based on the optimized gradation equation,the relative slake durability index is derived and the correctness of the model is verified.As the sample lumpiness increases,the slake durability index and relative slake durability index all decrease.
作者
张磊
ZHANG Lei(Kaifeng City Construction Engineering Quality Inspection Station,Kaifeng 475000,China)
出处
《水电能源科学》
北大核心
2020年第8期118-120,124,共4页
Water Resources and Power
基金
甘肃省安全生产科研项目(GAJ00011)
甘肃省青年科技基金计划(18JR3RM240)。
关键词
崩解
泥质岩
降雨
干湿循环
试验研究
disintegration
mudstone
rainfall
dry and wet cycle
experimental study
