[1]高红灵,李 昊,李晓军,等.泾阳Q2黄土剪切带微观结构研究[J].西安科技大学学报,2020,(02):253-258.
 GAO Hong-ling,LI Hao,LI Xiao-jun,et al.Study on micro-structure of slide-zone of Jingyang Q2 loess[J].Journal of Xi'an University of Science and Technology,2020,(02):253-258.
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泾阳Q2黄土剪切带微观结构研究(/HTML)
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西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

卷:
期数:
2020年02期
页码:
253-258
栏目:
出版日期:
2020-03-30

文章信息/Info

Title:
Study on micro-structure of slide-zone of Jingyang Q2 loess
文章编号:
1672-9315(2020)02-0253-06
作者:
高红灵1李 昊2李晓军2李卫珂1唐 皓2陈 伟2
(1.青海煤田地质局,西宁 青海 810012; 2.西安科技大学 地质与环境学院,陕西 西安 710054)
Author(s):
GAO Hong-ling1LI Hao2LI Xiao-jun2LI Wei-ke1TANG Hao2CHEN Wei2
(1.Qinghai Bureau of Coal Geology,Xining 810012,China; 2.College of Geology and Environment,Xi'an University of Science and Technology,Xi'an 710054,China)
关键词:
滑带土 纯剪切仪 微观结构 电镜扫描
Keywords:
slip zone soil pure shear apparatus micro-structure scanning electron microscope
分类号:
TU 435
文献标志码:
A
摘要:
黄土地区滑带土剪切过程中的微观结构特性研究是黄土滑坡滑动机制的研究重点。针对目前研究中滑带土微观分析尺度单一且对剪切过程中的土体矿物组分分析研究几乎没有的现状。文中基于自主研发的分离式环刀纯剪切仪,采用剪切试验和扫描电镜试验相结合的方式,开展了47.5 μm剪切位移下黄土剪切带的多尺度(微米级到毫米级)结构的微观结构与矿物特性表征。结果表明:在仅施加47.5 μm位移下,剪切缝已完全贯穿,最大缝宽155.95 μm,最小缝宽11.5 μm,形成了良好的导水通道。剪切缝中的矿物在剪切作用下,矿物颗粒脱离原来的位置并且在剪切缝中被挤压,揉搓,剪破,变成更小的矿物颗粒; 摩擦作用使得剪切缝两侧剪切面的微小矿物颗粒被揉搓脱落,剪切缝宽变大,在剪切缝两侧颗粒的矿物属性无法对应。剪切缝中有团聚体形成骨架支撑的现象,显示剪切缝在形成过程中不仅仅存着滑动摩擦,还存在着颗粒的滚动摩擦。文中所观察到的颗粒的滚动摩擦现象为解释滑坡,如远程高速滑坡的滑动机制提供了新思路。
Abstract:
The microstructure characteristics of slip zone soil during the shearing process is the focus of research on the mechanism of loess landslides.Due to the facts that the microstructure analysis of slip zone soil only has a single scale and there was nearly no research on the analysis of mineral composition during shearing,this paper explored the characteristics ofthe multi-scale(micron to millimeter)structure and the mineralogical characteristic of loess shear zone under 47.5 μm shear displacement based on the separated ring knife pure shearing instrument developed by ourselves and scanning electron microscope(SEM),using the shear test and scanning electron microscope tese.The results show that:by applying only 47.5 μm displacement,the shear crack has been completely penetrated.The maximum and minimum seam width is 155.95um,11.5 μm,forming a good water guiding channel.It was found that under the shearing action,the mineral particles in the middle of the shear joint were removed from the original position and the frictional resistance was increased in the shear joint to change into the mineral particles.It issqueezed,smashed,cut and turned into smaller mineral particles.The mineral particles are separated from the original position in the shear fracture,but the mineral properties of the particles on both sides of the shear fracture can not be matched.The fact that aggregates form skeleton support in the shear joint shows that there exist not only sliding friction but also rolling friction of particles in the process of shear joint formation.The examination of rolling friction of particles provides a new idea for explaining the sliding mechanism of landslides,such as long-distance high-speed landslides.

参考文献/References:

[1] 李 晓,梁收运,郑国东.滑带土的研究进展[J].地球科学进展,2010,25(5):484-491. LI Xiao,LIANG Shou-yun,ZHENG Guo-dong.Progresses in sliding zone soil of landslides[J].Advances in Earth Science,2010,25(5):484-491. [2] 江强强,路 路,焦玉勇,等.干湿循环下滑带土强度特性与微观结构试验研究[J].岩土力学,2019,40(3):1005-1012+1022. JIANG Qiang-qiang,LIU Lu,JIAO Yu-yong,et al.Strength properties and microstructure characteristics of slip zone soil subjected to wetting-drying cycles[J].Rock and Soil Mechanics,2019,40(3):1005-1012+1022. [3] 王 雷,赵法锁,程晓辉,等.黄土基岩接触面滑坡滑带土物理力学特性及微观结构[J].地球科学与环境学报,2017,39(3):450-458. WANG Lei,ZHAO Fa-suo,CHENG Xiao-hui,et al.Physical and mechanical properties and microstructure of slip soil in loess bedrock contact landslide[J].Journal of Earth Sciences and Environment,2017,39(3):450-458. [4]刘小丽,邓建辉,李广涛.滑带土强度特性研究现状[J].岩土力学,2004,25(11):1849-1854. LIU Xiao-li,DENG Jian-hui,LI Guang-tao.Shear strength properties of slip soils of land slides:anover view[J].Rock and Soil Me-chanics,2004,25(11):1849-1 854. [5]王 娟.G212线陇南段滑坡滑带土工程特性试验研究[D].兰州:兰州大学,2006. WANG Juan.Experimental study on engineering propertie sofslip soils of landslides along G 212 highway in long-nan[D].Lanzhou:Lanzhou University,2006. [6]齐 笛.延安地区黄土-基岩接触面滑坡滑带土的物理力学特征及微观结构变化机理研究[D].西安:长安大学,2016. QI Di.Study on microstructure and mechanical properties of slip soil of loess-bedrock contact landslide in Yanan area[D].Xi'an:Chang'an University,2016. [7]侯晓坤,李同录,谢 萧,等.甘肃Q3原状黄土的微观结构对其土-水特征曲线的影响[J].水利学报,2016,47(10):1307-1314. HOU Xiao-kun,LI Tonglu,XIE Xiao,et al.Effect of undisturbed Q3 loess microstructure on its SWCC[J].Journal of Shuli,2016,47(10):1307-1314. [8]许 健,王掌权,任建威,等.原状与重塑黄土冻融过程渗透特性对比试验研究[J].工程地质学报,2017,25(2):292-299. XU Jian,WANG Zhang-quan,REN Jian-wei,et al.Comparative experimental study on permeability of undisturbed and remolded loess under freezing-thawing condition[J].Journal of Engineering Geology,2017,25(2):292-299. [9]吴 凯,倪万魁,刘海松,等.压实黄土强度特性与微观结构变化关系研究[J].水文地质工程地质,2016,43(5):62-69. WU Kai,NI Wan-kui,LIU Hai-song,et al.Research on the relationships between the strength properties of compacted loess and microstructural changes[J].Hydrogeology & Engineering Geology,2016,43(5):62-69. [10]Wen B P,Duzgoren-Aydin N S,Aydin A.Geochemical characteristics of the slip zones of a landslide in granitic saprolite,Hong Kong:implications for their development and microenvironments[J].Environmental Geology,2004,47(1):140-154. [11]Wen B P.Deformation history of a landslide slip zone in light of soil microstructure[J].Environmental & Engineering Geoscience,2004,10(2):123-149. [12]Wen B P,Aydin A.Mechanism of a rainfall-induced slide-debris flow:constraints from micro-structure of its slip zone[J].Engineering Geology,2005,78(1-2):69-88. [13]Chen J,Dai F,Xu L,et al.Properties and microstructure of a natural slip zone in loose deposits of red beds,southwestern China[J].Engineering Geology,2014,183:53-64. [14]陈 剑,安孟可,龙 维,等.云南汤家山松散堆积层滑坡滑带土的微观结构与机理分析[J].工程勘察,2015,43(1):5-10+25. CHEN Jian,AN Meng-ke,LONG Wei,et al.Microstructure and mechanism analysis on the slip zone soil of Tangjiashan loose-deposits landslide in Yunnan province[J].Geotechnical Investigation & Surveying,2015,43(1):5-10+25. [15]赵能浩,易庆林,胡大儒.滑带土力学性质及其对滑坡的控制机理研究[J].人民长江,2014,45(13):32-36. ZHAO Neng-hao,YI Qin-ling,HU Da-ru.Physical and mechanical properrties of sliding-zone soil and mechanism of its action on landslide deformation[J].Yangtzi River,2014,45(13):32-36. [16]刘 伟.黄土-泥岩接触面滑坡滑带土变形特征研究[D].兰州:兰州大学,2016. LIU Wei.Study on deformation characteristics of slip surface of loess-mudstone interface landslide[D].Lanzhou:Lanzhou University,2006. [17]鲁 莎.三峡库区黄土坡滑坡滑带特性及变形演化研究[D].北京:中国地质大学,2017. LU Sha.Study on slip zone properties and evolution characteristics of Huangtupo landslide in three gorges reservoir area[D].Beijing:China University of Geosciences,2017. [18]谌文武,刘 伟,林高潮,等.黄土-泥岩接触面滑坡滑带土力学特征研究[J].冰川冻土,2017,39(3):593-601. CHAN Wen-wu,LIU Wei,LIN Gao-chao,et al.Study of the mechanical characteristics of slip zone soils sampled from loess-mudstone interface[J].Journal of Glaciology and Geocryology,2017,39(3):593-601. [19]Erginal A E,Öztürk B,Ekicnci Y L,et al.Investigation of the nature of slip surface using geochemical analyses and 2-D electrical resistivity tomography:a case study from Lapseki area,NW Turkey[J].Environmental Geology,2009,58(6):1167-1175. [20]Regmi A D,Yoshida K,Dhital M R,et al.Weathering and mineralogical variation in gneissic rocks and their effect in Sangrumba Landslide,East Nepal[J].Environmental Earth Sciences,2014,71(6):2711-2727. [21]刘 动,陈晓平.滑带土环剪剪切面的微观观测与分析[J].岩石力学与工程学报,2013,32(9):1827-1834. LIU Dong,CHEN Xiao-ping.Microscopic observation and analysis of ring shear surface of slip zone soil.Chinese Journal of Rock Mechanics and Engineering,2013,32(9):1827-1834. [22]蒋明镜,彭立才,朱合华,等.珠海海积软土剪切带微观结构试验研究[J].岩土力学,2010,31(7):2017-2029. JIANG Ming-jing,PENG Li-cai,ZHU He-hua,et al.Microscopic investigation on shear band of marine clay in Zhuhai,China.Rock and Soil Mechanics,2010,31(7):2017-2029. [23]杨 硕.黄土跨尺度微观模型的初步建立与应用[D].西安:西安科技大学,2015. YANG Shuo.Preliminary establishment and application of trans-scale microstructure model of loess[D].Xi'an:Xi'an University of Science and Technology,2015.

相似文献/References:

[1]张国明,张彬,李亚玲,等.江外南各统滑坡滑带土力学参数的确定[J].西安科技大学学报,2009,(04):470.[doi:10.13800/j.cnki.xakjdxxb.2009.04.017]

备注/Memo

备注/Memo:
收稿日期:2019-01-11 责任编辑:杨忠民
基金项目:国家自然科学基金(41602305); 黄土与第四纪地质国家重点实验室开放基金项目(SKLLQG1612); 国土资源部黄土地质灾害重点实验室项目(KLGLAMLR201504)
通信作者:陈 伟(1984-),男,安徽淮北人,副教授,E-mail:chenwei0930@xust.edu.cn
更新日期/Last Update: 2020-03-30