摘要
以四川汉源九襄地区堆积体为例,通过现场勘测,结合粒度分析仪、全面图解计算法等途径,对其沉积特征、粒度参数进行计算与分析,并取得以下主要成果:堆积体以粗、巨颗粒为主,磨圆度介于较好和极差之间,粒径相差悬殊,密实性较好;其在粒度频率曲线上大多表现为双峰型,其主次峰分别处于不同粒组,且均以粗颗粒占优势;堆积体平均粒径分布较广,介于1.73Φ～5.79Φ之间;分选性较差,峰度为平坦到尖锐,偏度总体上呈现正偏;由于堆积体受到流水作用,在粒度参数上均与冰川沉积物存在差异。研究堆积体沉积特征能对其种类划分与工程地质特性有较为全面地把握,并对还原古气候变化具有重要的借鉴意义。
Taking Jiuxiang deposit in Hanyuan county,Sichuan as an example,this paper calculates and analyzes its sedimentary characteristics and grain size parameters by means of on-site investigation,grain size analyzer and comprehensive graphical calculation.The main results are as follows:The deposit is mainly composed of coarse and giant particles,and its roundness is between good and poor.Particle size difference,compactness is good;Most of its particle size frequency curves are bimodal,the main and secondary peaks are in different groups of particles,and coarse particles are dominant;The average particle size distribution of the deposits is wider,ranging from 1.73 to 5.79;poor sorting,the kurtosis is flat to sharp,skewness overall;The grain size parameters of the deposits are different from those of glacial sediments because of the flow action.The study of sedimentary characteristics of accumulations can give a comprehensive grasp of their classification and engineering geological characteristics,and is of great significance for reducing paleoclimate change.
作者
丁昊
涂国祥
赵永辉
赵石力
DING Hao;TU Guoxiang;ZHAO Yonghui;ZHAO Shili(State Key Laboratory of Geological Disaster Prevention and Geological Environmental Protection,School of Environment and Civil Engineering,Chengdu University of Science and Technology,Chengdu,Sichuan 610059,China;Tibet Water Conservancy and Electric Power Survey and Design Institute,Lhasa,Tibet 850000,China)
出处
《水利与建筑工程学报》
2018年第6期50-55,共6页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金“降雨在山岳型冰水堆积体中的入渗过程及对其稳定性影响的时间效应研究”(41472274)
关键词
堆积体
沉积特征
粒度
平均粒径
偏度
峰度
accumulations
sedimentary characteristics
grain size
average particle size
skewness
kurtosis
