摘要
为研究泥石流堆积区单期和多期粒度分布及其关系,通过现场调查和颗粒分析试验,采用统计法分析泥石流堆积区形态特征、平面和垂向粒度分布特征。结果表明:泥石流堆积区呈中间高两侧低,横轴与纵轴长度基本一致;平面上纵向从沟口到堆积扇前缘粒径逐渐增大,曲线范围峰值粒径百分含量中轴线最大,向两侧逐渐减小,中轴线粒径集中性强;平面上横向从沟口到堆积扇前缘粒径呈增大的趋势,曲线范围峰值逐渐变大,曲线范围峰值粒径百分含量逐渐增加,堆积区中部粒径集中性强;垂向上自上而下厚度逐渐增大,粒径曲线范围峰值主要为10~20 mm,具有较好的集中性。研究成果可为泥石流形成机理研究和泥石流防治规划等提供参考。
To investigate the distributions and correlations of single-stage and multi-stage particles in the accumulation areas of debris flow, field investigation, particle analysis, and statistical analysis of the debris flow deposits were conducted, a debris flow accumulation area and its horizontal and vertical particle distributions were scrutinized. Results show that the debris flow accumulation area is dome-like shaped alluvia fan with identical lateral lengths in both transverse and longitudinal directions. In the longitudinal direction, grain size gradually increase from the outfall to the leading edge of the alluvial fan. The maximum grain size in the curve range peaked at the central line and decrease in both flanks gradually. The concentration of particle size is high in the central line. In the transverse direction, the grain size show an increasing tendency from the outfall to the leading edge. The maximum grain size in the curve range increase, and its percentage grow steadily. The particle size concentration is high in the center. In the vertical direction, the layer thickness of accumulation increase from the top to the bottom gradually, the curve-range peak grain size is mainly in the range of 10~20 mm with a relatively high concentration. The results provide an insight to the mechanisms of debris-flow forming and a reference for the prevention and control of debris flow.
作者
王运兴
周自强
白晓华
张国信
贾雪梅
WANG Yun-xing;ZHOU Zi-qiang;BAI Xiao-hua;ZHANG Guo-xin;JIA Xue-mei(Institute of Geological Hazards Prevention,Gansu Academy of Sciences,Lanzhou 730000,China)
出处
《科学技术与工程》
北大核心
2020年第20期8073-8078,共6页
Science Technology and Engineering
基金
甘肃省科学院青年科技创新基金(2017 QN-06)
甘肃省科学院地质灾害防治与生态地质环境修复创新团队(CX201801)。
关键词
泥石流
堆积区
粒度
特征
debris flow
accumulation area
grain-size
feature
