基于激光衍射法的湿陷性土粒度分布研究  

Study on particle size distribution of collapsible soil based on laser diffraction

作　　者：张诏飞 李西鹏 席伟 ZHANG Zhao-fei;LI Xi-peng;XI Wei(China Railway Resources Group Survey and Design Co.,LTD,Langfang 065000,China;Central Laboratory of China Railway Resources Group Co.,LTD,Langfang 065000,China)

机构地区：[1]中铁资源集团勘察设计有限公司,河北廊坊065000 [2]中铁资源集团有限公司中心试验室,河北廊坊065000

出　　处：《佛山科学技术学院学报（自然科学版）》2022年第6期49-54,共6页Journal of Foshan University(Natural Science Edition)

基　　金：中国中铁股份有限公司科技开发重点科研课题资助(20-重点-01)。

摘　　要：通过对刚果(金)南部不同矿山的湿陷性土试样进行激光衍射法测量试验,分析试样的粒度分布特征,结果表明:试样主要粒组为粉粒组和细砂组,粒度分布曲线具有双峰特征。参照国内标准,其工程分类为含砂低液限黏土;按分形理论分析,其具有显著的分形特征,分维值在2.0~2.3之间,与国内湿陷性黄土分维值相似;渗透变形类别为流土,允许水力梯度在0.35~0.50之间。研究表明:如果尾矿坝坝基下的水力梯度控制在0.30~0.35以下,则坝基安全,为尾矿坝的工程建设和安全稳定提供理论参考。The laser diffraction method was used to measure the soil samples from different mines in the south of Congo(DRC), and the particle size distribution characteristics of the samples were analyzed. The results show that the main particle groups of the samples are silt and fine sand, and the particle size distribution curve has the characteristics of bimodal. According to the domestic standard, it is classified as clay with sand and low liquid limit. According to the fractal theory analysis, it has significant fractal characteristics with fractal dimension values ranging from 2.0 to 2.3, which is similar to the fractal dimension values of collapsible loess in China. The seepage deformation is classified as flowing soil, and the allowable hydraulic gradient is between 0.35 and 0.50.The research shows that if the hydraulic gradient under the tailings dam foundation is controlled below0.30-0.35, the dam foundation is safe, which provides theoretical reference for the construction and safety and stability of tailings dam.

关 键 词：湿陷性土 激光衍射法 双峰特征 分形维值 水力梯度 

分 类 号：TU411[建筑科学—岩土工程]