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基于图像测量的饱和细砂排水剪切试验研究

ISSN号：1000-7598
期刊名称：《岩土力学》
时间：0
分类：TU411[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]大连理工大学建设工程学部土木工程学院岩土工程研究所,辽宁大连116024, [2]大连理工大学海岸和近海工程国家重点试验室,辽宁大连116024
相关基金：国家自然科学基金重点基金资助项目（No.50639010）;国家自然科学基金青年基金资助项目（No.50808033）.

关键词：图像测量, 南宁饱和细砂, 排水剪切试验, 成样方法, 切线模量参数, digital image measuring, Nanning saturated fine sand, drained shear test, sample preparation method, tangent modulus parameter

中文摘要：

将计算机数字图像测量技术应用于土工静力三轴试验的土样变形测量，实现了土样变形的非接触测量。针对南宁饱和细砂，采用干装敲击法和控制不同初始成样含水率的湿装夯实法制备松砂和密砂试样，联合采用数字图像测量技术与常规三轴变形量测方法，在不同围压下进行了固结排水剪切试验。着重探讨了成样方法、初始成样含水率、密实程度、固结围压对两种量测方法所获得的应力一应变关系与邓肯一张模型中的切线模量5参数的影响。试验结果表明：成样方法、初始成样含水率、密实程度和围压决定土样的剪切破坏形式，影响应力一应变关系；剪切破坏的形式以及剪切带位置的不同，导致图像测量和常规三轴试验获得的轴向应变和偏应力数值均存在不同程度的差异；邓肯一张模型5参数不仅受到试样的成样方法、初始成样含水率、密实程度的影响，而且受到量测方法的影响。

英文摘要：

By the application of computer digital image measuring technique to sample deformation measurement of soil static triaxial test, non-contact measuring of soil specimen deformation was realized. For Nanning saturated fine sand, loose and dense samples were prepared respectively by dry-rapping method and wet-tamping method controlling the different initial moisture content. Combining the digital image measuring technique with traditional triaxial deformation measuring method, consolidation drained shear tests were made under different confining pressures. The influence of sample preparation methods, initial moisture content, degree of compaction and consolidation pressure on relation of stress and strain and different of tangent modulus 5 parameters of Duncan-Chang model by means with the two measurement methods are researched. The test results show that the forms of sample shear failure are decided by the sample preparation method, initial water content, density and confining pressure; and the relations between stress and strain are affected also. There were differences of axial strain and deviator stress by image measuring and traditional triaxial cause because the different shear failure forms and the location of shear band. Duncan-Chang model 5 parameters are affected not only by the sample preparation method, initial moisture content and, density, but also by the methods of measurement.

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