土工基础

›› 2014, Vol. 28 ›› Issue (2): 117-120.

• 工程实录 • 上一篇    下一篇

宜昌唐家湾白垩系五龙组砂岩粒度特征

刘 力1，黎 睿1，张晓娟1，吴高昌2   

  1. （1.三峡大学土木与建筑学院，湖北宜昌 443002;2.三峡大学水利与环境学院，湖北宜昌 443002）
  • 收稿日期:2013-12-29 出版日期:2014-04-21 发布日期:2014-04-25
  • 作者简介:刘力（1987-），男，三峡大学土木与建筑学院研究生，研究方向为地质工程。

Grain Characteristics in Sandstone in Wunlong Group of Cretaceous Age at Tangjiawan, Yichang City

LIU Li1， LI Rui1， ZHANG Xiaojuan1, WU Gaochang2   

  1. (1.College of Civil Engineering and Architecture, Three Gorges Unversity, Yichang, 443002；
    2.College of Water Conservancy and Environment，Three Gorges Unversity, Yichang, 443002)
  • Received:2013-12-29 Online:2014-04-21 Published:2014-04-25

摘要： 对宜昌市唐家湾附近出露的白垩系剖面进行了野外描述和取样，探讨了白垩系砂岩沉积物的粒度参数特征。出露地层剖面粒序变化较大，整体呈现砂包泥的特征，交错层理发育，反映沉积过程中的动力变化过程；沉积物平均粒径、分选系数、偏态、峰态等粒度参数显示，各样品粒度参数规律一致，指征了当时沉积区域水动力条件较强且稳定的特点，沉积物粒度各组分中跳跃总体十分发育，是最具代表性的白垩系辫状河相沉积。

关键词: 五龙组, 辫状河相, 粒度参数, 白垩系, 沉积环境

Abstract: The cretaceous age geological profile near Tangjiawan in Yichange City has been field sampled and descripted in order to evaluate the grain size sedimentary parameters of sandstone in this age. There are significant changes in the sequence of the cretaceous outcrops although the sequence is generally presented by mud surrounded by sand. The central bar and cross-bedding is common in the sandstone due to the dynamic sedimentary environment. The grain size parameters are consistent in all samples from sedimentary indicators such as, mean grain size, sorting coefficient, skewness and kurtosis. These are the strong and stable indications of the sedimentary hydrodynamic conditions. The overall bouncing in the all grain size groups in the sediment is very developed. The layer in this age is the most representative of the cretaceous braided river facies.

Key words: Wulong Group, Braided River, Grain Size Parameter, Cretaceous Age, Sedimentary Environment