Correlation Analysis between Clay Mineral Composition and Shear Strength
-
摘要: 为探究矿物成分对土体强度的影响规律，对纯的粘土矿物进行扫描电镜和X射线衍射试验，确定其成分及微观组构. 对人工配制单一成分粘土，开展不同初始含水率状态下的直剪试验，分析了含水率对各单一矿物粘性土的粘聚力、内摩擦角的影响；对比不同粘土矿物人工配土抗剪强度随含水率变化规律，结合各单一矿物的微观组构特征，探讨了粘土矿物成分对剪切强度的影响. 研究结果表明：高岭石的粘聚力、内摩擦角均随含水率增大单调减小；伊利石和蒙脱石在含水率分别为18%和25%时出现粘聚力峰值；含水率小于20%时，蒙脱石内摩擦角随含水率增加呈线性增大；大于20%时，内摩擦角线性减小.Abstract: The influence of mineral composition on soil shear strength was investigated in this study. Using scanning electron microscopy and X-ray diffraction measurements, the composition and microstructure of pure clay minerals was obtained. Single-component clay samples were manually prepared with different initial water contents, and direct shear tests were performed to analyse the influence of moisture content on the cohesive force and internal friction angle of single mineral viscous soil. The results show that the cohesion and friction angle of kaolinite decrease monotonically with an increase in water content. Illite and montmorillonite exhibit peak cohesion when the water content is 18% and 25%, respectively. When the moisture content is approximately 20%, the maximum internal friction angle for montmorillonite appears.
-
Key words:
- clay minerals /
- shear strength /
- moisture content /
- cohesion /
- friction angle
-
图 3 单一矿物土的剪应力-含水率的关系
Figure 3. Relationship between shear strength and moisture content of mono-mineral
图 5 伊利石、马兰黄土抗剪强度参数与含水率的关系
Figure 5. Relationship between shear strength and moisture content of illite and Malan loess
图 6 蒙脱石及其他粘土粘聚力与含水率的关系
Figure 6. Relationship between cohesion and moisture content of montmorillonite and referenced soils
图 7 蒙脱石、红粘土内摩擦角与含水率的关系
Figure 7. Relationship between friction angle and moisture content of Montmorillonite and red clay
表 1 单一矿物重塑土的液塑限
Table 1. Liquid and plastic limit of single mineral soil
项目 高岭石 伊利石 蒙脱石 塑限 25 32 65 液限 40 51 140 
下载: 导出CSV
-
BERGAYA F, LAGALY G. Handbook of clay science[M]. [S. l.]: Elsevier Science Ltd., 2013: 5-7 高国瑞. 近代土质学[M]. 2版. 北京: 科学出版社, 2013: 1-2 袁聚云, 钱建国, 张宏鸣, 等. 土质学与土力学[M]. 4版. 北京: 人民交通出版社, 2009: 27 宁建国,黄新. 土样矿物成分对固化土抗压强度增长的影响[J]. 岩土力学,2010,31(1): 113-117NING Jianguo, HUANG Xin. Effects of soil mineral composition of the stabilized soil strength increasing[J]. Rock and Soil Mechanics, 2010, 31(1): 113-117 阎瑞敏,桂蕾. 滑带土抗剪强度与其矿物成分典型相关性分析[J]. 人民长江,2016,47(8): 47-50YAN Ruimin, GUI Lei. The canonical correlation analysis between Slip zone soil shear strength and its mineral composition[J]. Yangtze River, 2016, 47(8): 47-50 黄琨,万军伟,陈刚,等. 非饱和土的抗剪强度与含水率关系的试验研究[J]. 岩土力学,2012,33(9): 2600-2604HUANG Kun, WAN Junwei, CHEN Gang, et al. Experimental research of the relationship between unsaturated soil shear strength and moisture content[J]. Rock and Soil Mechanics, 2012, 33(9): 2600-2604 张有瑜. 泥页岩组构X射线衍射定量分析方法[J]. 现代地质,1997,11(1): 29-34Zhang Youyu. Quantitative analysis of shale structure by X-ray diffraction[J]. Modern Geology, 1997, 11(1): 29-34 胡林彦,张庆军,沈毅. X射线衍射分析的实验方法及其应用[J]. 河北理工学院学报,2004,26(3): 83-86HU Linyan, ZHANG Qingjun, SHEN Yi. X-ray diffraction analysis of experiment method and its application[J]. Journal of Hebei Institute of Technology, 2004, 26(3): 83-86 王家鼎,张倬元,李保雄. 黄土自重湿陷变形的脉动液化机理[J]. 地理科学,1999,19(3): 271-276WANG Jiading, ZHANG Zhuoyuan, LI Baoxiong. A mechanism in loess self-load collapse[J]. Scientia Geographica Sinica, 1999, 19(3): 271-276 郑洪汉,顾雄飞,韩家懋,等. 中国黄土中的粘土矿物及其在地层剖面中的变化趋势[J]. 第四纪研究,1985,6(1): 158-165ZHENG Honghan, GU Xiongfei, HAN Jiamao, et al. Clay mineral in loess of China and their tendency in loess section[J]. Quaternary Sciences, 1985, 6(1): 158-165 熊承仁,刘宝琛,张家生,等. 重塑非饱和粘性土的抗剪强度参数与物理状态变量的关系研究[J]. 中国铁道科学,2003,24(3): 18-21XIONG Chengren, LIU Baochen, ZHANG Jiasheng, et al. Study on relationship between shear strength parameters and physical state variables of remolded unsaturated cohesive soils[J]. China Railway Science, 2003, 24(3): 18-21 李涛,刘波,杨伟红,等. 基质吸力对重塑红黏土抗剪强度影响的试验研究[J]. 中国矿业大学学报,2013,42(3): 375-381LI Tao, LIU Bo, YANG Weihong, et al. Experimental study on the effect of matrix suction on the shear strength of remolded red clay[J]. Journal of China University of Mining and Technology, 2013, 42(3): 375-381 王中文,洪宝宁,刘鑫,等. 红粘土抗剪强度的水敏性研究[J]. 四川大学学报:工程科学版,2011,43(1): 17-22WANG Zhongwen, HONG Baoning, LIU Xin, et al. Study on water sensitivity of shear strength of red Clay[J]. Journal of Sichuan University:Engineering Science Edition, 2011, 43(1): 17-22 胡瑞林, 李向全, 官国琳, 等. 粘性土微结构定量模型及其工程地质特征研究[M]. 北京: 地质出版社, 1995: 3-4 文宝萍,胡艳青. 颗粒级配对非饱和粘性土基质吸力的影响规律[J]. 水文地质工程地,2008,35(6): 50-55WEN Baoping, HU Yanqing. Effects of particle size distribution on matrix suction of unsaturated cohesive soil[J]. Hydrogeology and Engineering Geology, 2008, 35(6): 50-55 何蕾. 矿物成分与水化学成分对粘性土抗剪强度的控制规律及其应用[D]. 北京: 中国地质大学, 2014 文宝萍,陈海洋. 矿物成分、特征地球化学组分对水在滑带形成中作用的指示意义: 以三峡库区大型滑坡为例[J]. 地学前缘,2007,14(6): 98-106WEN Baoping, CHEN Haiyang. Mineral compositions and elements concentrations as indicators for the role of groundwater in the development of landslide slip zones: a case study of large-scale landslides in the Three Gorges area in China[J]. Earth Science Frontiers, 2007, 14(6): 98-106 MESRI G AND OLSON R E. Shear strength of montmorillonite[J]. Geotechnique, 1970, 20(3): 261-270 WANGLER T, SCHERER G W. Clay swelling mechanism in clay-bearing sandstones[J]. Environmental Geology, 2008, 56(3/4): 529-534 曾志姣. 非饱和红粘土抗剪强度特性研究及其应用[D]. 长沙: 中南大学, 2008: 31-35 伍岳峰. 土颗粒粒径分维值与土的粘聚力的关系[J]. 湖南水利水电,2007,2(12): 23-24WU Yuefeng. The relationship between factal dimensions of soil particle size and cohesion of soil[J]. Waterpower and Hydropower Engineer, 2007, 2(12): 23-24 -
下载:
点击查看大图
图(7) / 表(1)
计量
- 文章访问数: 435
- HTML全文浏览量: 366
- PDF下载量: 75
- 被引次数: 0