粘土的拉裂试验及声发射检测

综述击实粘土拉裂试验的各种方法。三轴拉伸试验和周期拉压试验，用于研究静力拉裂和周期加荷拉裂的破坏，在土石坝有限元分析中判别防渗体土料拉裂和震裂的发生与发展。对试样拉裂时进行声发射检测，可研究试样拉裂破坏的过程，随着围压增大，试样由拉裂破坏而逐渐变为剪切破坏

Tensile Test and Acoustic Emission Detection of Clay

Various tensile test methods for compacted clay are reviewed. The triaxial extension test and the cyclic extension compression test are used in the research of soil failure under static tensile crack or cyclic tensile crack conditions to identify the development of tensile crack as well as shock crack in FEM analysis of embankments. Acoustic emission measurement has been performed during cracking of specimens for the study of the process. It is shown that the failure varies gradually from tensile failure to shear failure with the increasing confining pressure.