[1]邓津,安亮.天水黄土震陷性与微观孔隙参数分析[J].防灾科技学院学报,2018,20(02):6-14.
 Deng Jin,liang An.Analysis on Tianshui Loess Seismicity and its Microscopic PoreParameters[J].JOURNAL OF INSTITUTE OF DISASTER PREVENTION,2018,20(02):6-14.
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天水黄土震陷性与微观孔隙参数分析
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《防灾科技学院学报》[ISSN:1673-8047/CN:13-1377/P]

卷:
第20卷
期数:
2018年02期
页码:
6-14
栏目:
目次
出版日期:
2018-06-30

文章信息/Info

Title:
Analysis on Tianshui Loess Seismicity and its Microscopic Pore Parameters
作者:
邓津123安亮123
1.中国地震局兰州地震研究所, 中国地震局地震预测研究所兰州创新基地,甘肃 兰州730000; 2.中国地震局兰州地震研究所,黄土地震工程重点实验室,甘肃 兰州730000; 3.甘肃省岩土防灾工程技术研究中心,甘肃 兰州730000
Author(s):
Deng Jin123 liang An123
1.Key Laboratory of Loess Earthquake Engineering, Lanzhou Institute of Seismology,CEA, Lanzhou 730000, China; 2. Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province, Lanzhou 730000, China;3. lanzhou Base of Institute of Earthquake Prediction, China Earthquake Administration,Lanzhou 730000,China
关键词:
天水黄土 震陷性 微观孔隙参数 孔隙形状因子 孔隙概率熵
Keywords:
Tianshui Loess seismic subsidence microstructure pore parameters pores shape factor probability entropy of pore
分类号:
P642.13+1
文献标志码:
A
摘要:
针对天水不同黄土场地,选取洪冲积、河流阶地、河漫滩、洪积扇、滑坡等代表性场地,进行取样及震陷性及微观孔隙分析。采用动三轴和电镜试验及微观图像处理方法,试验结果表明:天水黄土粘粒含量较高,塑性指数较低,平均低于10,划分仍在粉土范围;天水黄土具有震陷不均匀性,含水量较高,震陷系数大的特点。由于天水黄土多具有架空孔隙结构,采用孔隙面积和围压等参数的震陷系数公式计算的震陷系数与试验结果基本符合。进一步的微观孔隙分析表明:孔隙长轴、短轴及孔隙面积均值、概率熵、曲率系数、形状系数曲线、玫瑰图等参数及指标,与震陷性强弱有较好的相关性。即孔隙尺寸越大,孔隙面积分布峰值越高,孔隙概率熵越小,曲率系数越大,震陷性越强。随着震陷性由小到大变化,孔隙形状因子曲线依次变陡。
Abstract:
Aiming at different loess sites for Tianshui, we selected loess sampls from flood and alluvial, river terraces, alluvial flat, diluvial fan, landslides etc. and anylyzed their microscopic pore. Using the dynamic triaxial, electron microscope test and microimage processing, we obtain the test results show that the clay content of Tianshui loess is higher, the plasticity index which is less than 10 is low, however, the division is still in the scope of powder loess. The characteristics of Tianshui loess show the uneven seismic subsidence, higher water content and large seismic subsidence coefficient. Because most of the Tianshui loess has an overhead pore structure, the seismic subsidence coefficient calculated by the seismic subsidence coefficient formula by pore area and confining pressure, which is basically consistent with the test results. The microscopic pores structure analysis shows some parameters have good correlation with the of strength seismic subsidence, such as long and short axises and area of the pore, probability entropy, curvature coefficient, shape coefficient curve, rose diagram. That is, the larger pore size, the higher peak of pore area distribution, the smaller the probability entropy of pore, the greater the curvature coefficient, and the stronger the seismicity, and as the seismic subsidence changes from small to large, the pore shape factor curves become steeper in turn.

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备注/Memo

备注/Memo:
收稿日期:2018-05-17 基金项目:国家自然科学基金面上项目(51578518) 作者简介:邓津(1970—), 女,博士,副研究员,研究方向为黄土微观动力学。
更新日期/Last Update: 2018-06-30