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典型地貌区原状黄土孔隙细观特征研究
引用本文:刘钊钊,钟秀梅,张洪伟,高中南,梁收运,王谦.典型地貌区原状黄土孔隙细观特征研究[J].水文地质工程地质,2019,0(2):148-148.
作者姓名:刘钊钊  钟秀梅  张洪伟  高中南  梁收运  王谦
作者单位:1.兰州大学土木工程与力学学院,甘肃 兰州730000;2. 中国地震局兰州地震研究所,甘肃 兰州730000;3. 中国地震局黄土地震工程重点实验室,甘肃 兰州730000
基金项目:中国地震局地震预测研究所基本科研业务经费项目资助(2016IESLZ01;2018IESLZ06);国家基础研究发展计划项目(973计划)资助(2014CB744701);国家自然科学基金项目资助(51778590;51408567)
摘    要:以黄土高原典型地貌区14个场地的原状黄土为研究对象,通过扫描电子显微镜获取图像,借助PCAS孔隙图像识别与分析系统,得到了原状黄土在孔隙尺度、排列、形态和类型等方面的细观结构特征;并依据分形理论,对黄土梁峁区、塬区和台塬区三类典型地貌区的孔隙细观特征进行了统计分析。结果表明:不同地貌区的原状黄土孔隙结构有显著差异,黄土梁峁区表观孔隙比明显大于黄土塬区与台塬区;平均孔隙面积与孔隙数呈负相关关系,孔隙数在黄土梁峁区自西向东递减,在黄土塬区递增,在黄土台塬区差异较大;孔隙度分维值在黄土梁峁区相差不大,在黄土塬区自西向东递增,在黄土台塬区差异较大;孔隙概率熵多大于0.98,孔隙排列较为混乱,缺乏明显定向性;黄土塬区的孔隙平均形状系数最大且分维数最低,其孔隙形状较为圆滑,孔隙复杂程度较低。

关 键 词:黄土高原地貌    细观结构    概率熵    平均形状系数    孔隙类型
收稿时间:2018-06-22
修稿时间:2018-09-14

Research on pore microscopic characteristics of undisturbed loess in typical geomorphologies
LIU Zhaozhao,ZHONG Xiumei,ZHANG Hongwei,GAO Zhongnan,LIANG Shouyun,WANG Qian.Research on pore microscopic characteristics of undisturbed loess in typical geomorphologies[J].Hydrogeology and Engineering Geology,2019,0(2):148-148.
Authors:LIU Zhaozhao  ZHONG Xiumei  ZHANG Hongwei  GAO Zhongnan  LIANG Shouyun  WANG Qian
Institution:1.College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, Gansu730000, China; 2.Lanzhou Institute of Seismology, CEA , Lanzhou, Gansu730000, China; 3.Key Laboratory of Loess Earthquake Engineering, CEA, Lanzhou, Gansu730000, China
Abstract:The undisturbed loess in 14 sites of typical geomorphologies in the Loess Plateau is taken as the research object. With the scanning electron microscope, loess microstructural images are obtained. By using the Pores and Cracks Analysis System (PCAS), the pore microscopic characteristics of the undisturbed loess in terms of scale, distribution, arrangement and type are gained. The fractal theory is also used to analyze the pore microscopic characteristics of the loess hilly-gully region, loess tableland and loess platform. The results show that there are significant differences in the pore structure of the undisturbed loess in different geomorphologies. The facial porosity ratio in the loess hilly-gully region is significantly greater than that in the loess tableland and loess platform. There is a negative correlation between the average pore area and pore number. The pore number decreases from west to east in the loess hilly-gully region, increases in the loess tableland, and varies greatly in the loess platform. The pore porosity fractal dimension is relatively uniform in the loess hilly-gully region, but increases from west to east in the loess tableland, and there are great differences in the loess platform. The probability entropy is mostly greater than 0.98. Pore arrangement is confusing and lacks obvious directionality. The loess tableland has the largest average form factor and the lowest pore fractal dimension. The loess tableland pore is smoother and its pore complexity is lower.
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