| 基于变形数字图像处理的土体拉伸试验装置的研发与应用 |
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| 引用本文： | 黄伟,项伟,王菁莪,程超杰,崔德山,刘清秉.基于变形数字图像处理的土体拉伸试验装置的研发与应用[J].岩土力学,2018,39(9):3486-3494. |
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| 作者姓名： | 黄伟 项伟 王菁莪 程超杰 崔德山 刘清秉 |
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| 作者单位： | 1. 中国地质大学（武汉）工程学院，湖北 武汉 430074；2. 中国地质大学 教育部长江三峡库区地质灾害研究中心，湖北 武汉 430074 |
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| 基金项目： | 国家自然科学基金（No. 41672297）。 |
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| 摘 要： | 研究黏土的抗拉性能对于认识离子固化剂改性黏土的黏聚力等力学性能有着重要的意义。针对现有拉伸测试装置的不足，设计研发了一套基于变形数字图像处理的土体材料拉伸试验装置，该装置包含应变控制模块、加载夹具模块、数据采集模块和数字图像处理模块。改进了现有加载夹具的不足，将土样形状设计为“8”型并运用FLAC3D有限元数值计算软件验证其合理性，巧妙地解决了夹具与土样之间的连接问题，并且将加载夹具功能与制样盒功能合并，避免了试样转移过程中可能受到的扰动。新增了图像采集装置，记录土样变形破坏过程，基于Geo-PIV数字图像处理软件分析土样试验过程中的变形规律。应用该装置开展了素蒙脱土及不同配比离子固化剂减小蒙脱土黏聚力对比试验研究，研究结果表明：拉伸仪能精确控制、采集土体的抗拉强度。粒子图像测速（particle image velocimetry，简称PIV）分析结果客观、真实地表明，试验过程中土样处于受拉状态，并且土样受加载夹具夹持的部位并未出现明显的应力集中现象；离子固化剂改性蒙脱土抗拉强度以及拉伸变形模量较未改性土低，降低程度随离子固结剂溶液浓度增大而增大；数据采集装置对应力、应变信息变化敏感。试验结果和数字图像结果表明，所设计的拉伸试验装置具合理性、可靠性以及敏感性。
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| 关 键 词： | 数字图像处理 拉伸试验装置 加载夹具 离子固化剂 蒙脱土 |
| 收稿时间： | 2017-11-30 |
Development and application of digital image processing technology based soil tensile apparatus |
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| HUANG Wei,XIANG Wei,WANG Jing-e,CHENG Chao-jie,CUI De-shan,LIU Qing-bing.Development and application of digital image processing technology based soil tensile apparatus[J].Rock and Soil Mechanics,2018,39(9):3486-3494. |
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| Authors: | HUANG Wei XIANG Wei WANG Jing-e CHENG Chao-jie CUI De-shan LIU Qing-bing |
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| Institution: | 1. Faculty of Engineering, China University of Geosciences, Wuhan, Hubei 430074, China;2.Three Gorges Research Center for Geo-hazard, Ministry of Education, China University of Geosciences, Wuhan, Hubei 430074, China |
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| Abstract: | Investigation on tensile properties using ionic soil stabilizer (ISS) contributes to better understanding about the modified mechanism of mechanical behavior such as cohesion. To overcome the defects of existing apparatus, a digital image processing technology-based soil tensile device which comprises displacement controlling module, loading holder module and data detecting module was developed. The soil shape in loading holder was designed as “8” shape to solve the problem about connection between soil and box without any adhesive force. The justification to design the “8” shape loading holder was verified by FLAC3D. In addition, the loading holder had the function of sample preparation box that could avoid soil disturbance when transforming sample from preparation box to loading holder. Image capture device was added to record the process of deformation and failure of soil sample so that these recorded images can be analyzed by digital image processing software named Geo-PIV to study the deformation of soil in the period of tensile test. After finishing the tensile test, comparative trial and investigation on raw montmorillonite and modified montmorillonite by adapting ISS solution with certain concentration were carried out. The results indicate that the soil sample is under tension without stress concentration at the part of sample that contacts the loading holder through the analysis of recorded transformative image based on PIV. Furthermore, tensile strengths and moduli of the modified montmorillonite by ISS are lower than those of raw montmorillonite and the degree of reduction increases with increasing concentration of ISS solution. The data acquisition module is sensitive to the change of stress and strain. Consequently, the developed tensile apparatus is reasonable, reliable and sensitive. |
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| Keywords: | digital image processing tensile apparatus loading holder ionic soil stabilizer montmorillonite |
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