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黄土微观结构研究的回顾和探讨
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作者 张玉蕴 郭俊凯 《科技情报开发与经济》 2003年第6期91-92,共2页
总结了黄土微观结构研究成果,即黄土的微观结构与其震陷性、湿陷性液化有紧密的联系,指出黄土微观结构的定量化是黄土工程性质的研究方向。
关键词 黄土微观结构 震陷性 湿陷性 液化 定量化
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基于图像处理的Q_3黄土的微观结构变化研究 被引量:31
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作者 谷天峰 王家鼎 +2 位作者 郭乐 仵大磊 李开超 《岩石力学与工程学报》 EI CAS CSCD 北大核心 2011年第S1期3185-3192,共8页
黄土地质灾害的发生与黄土的微结构特征息息相关。针对黄土微结构图像定量分析中存在的问题,对原状及循环荷载作用后Q3黄土的微观结构特征进行研究。首先探讨SEM图像处理中的降噪和分割方法,将Lee图像增强算法应用于图像的降噪处理,将FC... 黄土地质灾害的发生与黄土的微结构特征息息相关。针对黄土微结构图像定量分析中存在的问题,对原状及循环荷载作用后Q3黄土的微观结构特征进行研究。首先探讨SEM图像处理中的降噪和分割方法,将Lee图像增强算法应用于图像的降噪处理,将FCM聚类方法应用于灰度图像的分割,在此基础上计算循环荷载作用前后Q3黄土的孔隙面积、孔径、圆度、形态比等参数。结果表明:(1)通过SEM图像表观特征的分析可知,在动应力的作用下,大孔隙数目减少,颗粒排列逐渐密实,接触关系也逐渐由点接触变为面接触;(2)通过对孔隙面积、数量变化的分析可知,循环荷载产生的变形主要由于大孔隙破坏造成;(3)通过对孔隙定向分布特征的研究可知,原状黄土的孔隙具有定向特性,在循环荷载的作用下,孔隙的定向性发生改变;(4)通过对孔隙形状分布特征的研究可知,在动应力作用下,土颗粒发生转动,部分孔隙连通性受损。本研究可为揭示土体宏观受力的变形机制提供依据。 展开更多
关键词 土力学 黄土微观结构 SEM图像分析 孔隙变化
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基于支持向量机的Q_3黄土孔隙微观结构研究 被引量:9
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作者 谷天峰 王家鼎 +1 位作者 郭乐 李开超 《水文地质工程地质》 CAS CSCD 北大核心 2010年第6期102-106,共5页
为了解决利用黄土SEM图像提取孔隙参数的问题,将孔隙区域的提取问题转化为孔隙像素点的分类问题,通过把整个图像的像素点分为孔隙点和骨架点,从而实现孔隙的提取。利用这种方法,对潼关Q3黄土震陷试验前后的微结构图像进行处理,得到了动... 为了解决利用黄土SEM图像提取孔隙参数的问题,将孔隙区域的提取问题转化为孔隙像素点的分类问题,通过把整个图像的像素点分为孔隙点和骨架点,从而实现孔隙的提取。利用这种方法,对潼关Q3黄土震陷试验前后的微结构图像进行处理,得到了动力作用前后的孔隙分布图,并计算了孔隙面积、面孔隙度、孔隙分形维数等参数,结果表明:震陷试验后大孔隙数量减小,中、小孔隙数量有所增加,震陷主要是由大孔隙破坏所致。 展开更多
关键词 黄土微观结构 图像处理 支持向量机 孔隙分类
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扫描电镜技术在黄土场地工程勘察中的应用
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作者 徐建红 徐建卓 刘应然 《山西建筑》 2013年第21期58-59,共2页
以陕县某工地岩土工程详勘为例,利用扫描电镜技术获得不同深度黄土微观结构的高倍放大图片,通过对图片进行分析、描述,从微观结构角度直观地介绍了该场地黄土工程特性。结果表明扫描电镜技术可以作为工程勘察的有力补充手段。
关键词 扫描电镜 工程勘察 黄土微观结构
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Review and Discussion on Seismic Subsidence of Loess 被引量:2
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作者 Wang Qiang Sun Junjie +1 位作者 Wang Lanmin Chen Xiuqing 《Earthquake Research in China》 2013年第4期479-489,共11页
The research and achievements made on seismic subsidence of loess,obtained over the past30 years,were reviewed.Seismic Subsidence of Loess(SSL)has been verified by microstructure characteristics,dynamic triaxial exper... The research and achievements made on seismic subsidence of loess,obtained over the past30 years,were reviewed.Seismic Subsidence of Loess(SSL)has been verified by microstructure characteristics,dynamic triaxial experiments,and in-situ explosion tests,and has become an important subject in the field of seismic loess engineering research.While,the research is still in the stage of theoretical study of saturated soil,and there are no representative cases of seismic subsidence of loess in historical earthquakes.It is difficult to express structure characteristics using microstructure morphology.While,soil mechanics are available methods for this.Seismic subsidence judgment is absolute in some certain value ranges for several parameters.Therefore,probabilistic judgment should be developed.The seismic subsidence ratio is estimated mostly by empirical formulas or semiempirical and semi-theoretical formulas,which are based on laboratory data.These formulas are not established on the basis of physical process and mechanics of seismic subsidence,and this leads to more variables,complicated computation,and poor practicability.To solve these problems,we need to distinguish the main factors and corresponding variables,to establish a mechanics model for seismic subsidence estimation,and to characterize its physio-mechanical process.The key of anti-seismic subsidence treatment is to reduce the seismic subsidence property of soils,and to lower the interaction between the soil body and underground structures. 展开更多
关键词 Seismic Subsidence of Loess (SSL) Mechanism of seismic subsidence Seismic subsidence assessment Estimation of seismic subsidence amount MICROSTRUCTURE
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Experimental Study of the Subsidence Characteristics of Clayey Loess
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作者 Li Lan Wang Lanmin 《Earthquake Research in China》 2007年第4期420-427,共8页
Presented in this paper are the results of experimental study and analysis of the subsidence characteristics obtained from soil samples with different contents of clay particles though laboratory dynamic triaxial test... Presented in this paper are the results of experimental study and analysis of the subsidence characteristics obtained from soil samples with different contents of clay particles though laboratory dynamic triaxial test, Laser particle size analysis, chemical analysis and electronic microscope scanning. By comparison of the obtained data, the following conclusions are drawn out:(1)The stability of the loess varies with different content of clay; (2) The relation between the dynamic shear strength and the clay particles is not monotonous, but parabolic; (3) In the same consolidation ratio, the clayey loess is the weakest subsidence-resistant when the clay particle content is between 16%~17%. 展开更多
关键词 Subsidence-resistant behavior Clay particle content LOESS Microstructure
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Variation law of microscopic pore of loess-like soil after several freeze-thaw cycles in seasonal frozen soil region
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作者 CHEN Zongfang CHEN Hui'e ZHANG Ying 《Global Geology》 2013年第3期154-158,共5页
In seasonal frozen soil region,the engineering geological properties of loess-like soil will be deteriorated after freeze-thaw cycles.Through the freeze-thaw cycle experiment of remolded loess-like soil,under differen... In seasonal frozen soil region,the engineering geological properties of loess-like soil will be deteriorated after freeze-thaw cycles.Through the freeze-thaw cycle experiment of remolded loess-like soil,under different freezing temperatures,the authors carried out freeze-thaw cycle tests for 3 times and 20 times,respectively.With mercury intrusion porosimetry and granulometric analysis,from the micro-structure,the authors studied the law that freeze-thaw cycle times and frozen temperature effect on the variation of microscopic pore of loesslike soil.This result can provide theoretical basis for comprehensive treatment of problems in the construction of the project in seasonal frozen loess-like soil region. 展开更多
关键词 loess-like soil freeze-thaw cycles variation law of microscopic pore granulometric composition
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