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原状黄土显微结构特征与湿陷性状分析
宋章1, 程谦恭1, 张炜2, 孟凡超3
1. 西南交通大学土木工程学院,成都610031;
2. 机械工业勘察设计研究院,西安710043;
3. 中交公路规划设计院,北京100010
基于原状黄土的显微结构扫描电镜及室内湿陷性试验,分析了黄土的微结构特性和不同压力不同含水量下黄土的湿陷性状及其之间的内在联系,结果表明:随着埋藏深度的增加,由支架大孔微胶结结构逐渐变为镶嵌微孔半胶结结构,支架大孔孔隙发育逐渐变为粒间孔隙发育,再为微孔孔隙发育;黄土在增湿情况下其湿陷系数-压力关系曲线由三部分组成,初始压缩变形阶段,是结构强度发挥阶段,变形较小,黄土微结构没有遭到破坏;曲线第一转折点&s=0.015后,原有结构破坏,微结构发生变化,颗粒重新排列,湿陷速率增大,是湿陷变形主要阶段;达到峰值后,颗粒间形成了新的结构,湿陷变形幅度减小;随着骨架颗粒连接逐渐变为非架空的镶嵌排列,湿陷起始压力及峰值湿陷压力值随着埋藏深度的增加而增加,而峰值湿陷系数和湿陷变形量的压力范围随着埋藏深度的增加而变小;骨架颗粒特征和孔隙特征是黄土湿陷性的内在影响因素,而胶结物的多寡及胶结状态是黄土湿陷性强弱的主要影响因素之一。
ANALYSIS OF MICROSTRUCTURE FEATURE AND COLLAPSIBILITY OF UNDISTURBED LOESS
SONG Zhang1, CHENG Qiangong1, ZHANG Wei2, MENG Fanchao3
1. College of Civil Engineering, Southwest Jiaotong University, Chengdu 610031;
2. Institute of Geotechnical Investigation &|Design,MMI, Xi&an 710043;
3. China Highway Planning and Design Institute, Beijing 100010
Based on the scanning electron microscopy (SEM) of microstructure and collapsible test of undisturbed loess, the microstructure properties, the collapsible characteristics under different pressures and water contents, and the intrinsic mechanism between microstructure and collapsibility of loess were analyzed. The results indicated: (1) with the increasing of imbedding depth, the configuration of loess varying gradually from bracketed-macropore weak-cemented texture to inlaid-micropore half-cemented texture, the void properties from bracketed-macropore void to void among grains, th (2) the curves of coefficient of collapse-different pressures of loess under humidification can be divided into three phases, at the initial phase of compressive deformation was the course of loess compaction of structural strength, with a small settlement and microst (3) the second phase after the first turning point &s=0.015 of the curves was the primary course of collapse deformation, the microstructure varying and particles redistributed with along the intrinsic texture of loess damaged , and ratio of collapsible
and (4) the third, the new microstructure coming into being, the collapsible settlement decreased after the point of peak value. (5) the values of the initial collapsible pressure and the collapsible force of peak value increased, and the coefficient of collapse of peak value and the range values of pressures of collapsible settlement diminished as the increasin (6) the characteristics of framework grains and void of loess were the intrinsic influencing factors of collapsibility, and the amount and properties of cement were one of mainly contributing factors for the intensity of collapsibility of loess.
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作者简介: 宋章,主要从事基础工程方面的研究.Email:
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