郝记,王飞,曹平,等. 2021. 遍布节理试样压剪加载下的力学特性及声发射特征研究[J]. 工程地质学报,29(5):1247-1257. doi: 10.13544/j.cnki.jeg.2020-042.
    引用本文: 郝记,王飞,曹平,等. 2021. 遍布节理试样压剪加载下的力学特性及声发射特征研究[J]. 工程地质学报,29(5):1247-1257. doi: 10.13544/j.cnki.jeg.2020-042.
    Hao Ji, Wang Fei, Cao Ping, et al. 2021. Mechanical properties and AE characteristics of ubiquitous jointed specimens under compression shear load [J]. Journal of Engineering Geology, 29(5): 1247-1257. doi: 10.13544/j.cnki.jeg.2020-042.
    Citation: Hao Ji, Wang Fei, Cao Ping, et al. 2021. Mechanical properties and AE characteristics of ubiquitous jointed specimens under compression shear load [J]. Journal of Engineering Geology, 29(5): 1247-1257. doi: 10.13544/j.cnki.jeg.2020-042.

    遍布节理试样压剪加载下的力学特性及声发射特征研究

    MECHANICAL PROPERTIES AND AE CHARACTERISTICS OF UBIQUITOUS JOINTED SPECIMENS UNDER COMPRESSION SHEAR LOAD

    • 摘要: 节理岩体的力学性质对指导工程设计、施工具有重要的意义。为研究组合节理参数对遍布节理试样的力学性质影响,采用类岩材料预制不同节理倾角、间距的遍布节理试样并进行压剪试验。根据高清相机记录的不同节理试样的破坏特征,试样的破坏模式可分为平面剪切破坏、类完整性剪切破坏和斜剪切破坏,节理间距会改变试样的破坏模式而节理倾角对试样的破坏模式有关键性影响。分析不同节理参数试样的峰值剪切强度,遍布节理对试样的弱化程度达到15.95% ~56.62%,节理试样的峰值剪切强度随着节理间距的增大逐渐增强而随着节理倾角的增加先增后减。此外,采用声发射设备实时监测试样加载过程以分析不同节理参数试样的声发射特征。在压密阶段,节理试样的声发射最大撞击数随节理间距减小而增大。声发射峰值能量随节理间距减小而减小,但均值能量随节理间距减小而增大;试样的峰值能量和均值能量随节理倾角增大均呈现先增大后减小的规律。

       

      Abstract: The mechanical properties of jointed rock mass are of great significance for guiding engineering design and construction. In order to study the effect of the combined joint parameters on mechanical properties of specimens,we conducted compression-shear tests. We used rock-like materials to prefabricate ubiquitous jointed specimens with different joint inclinations and spacings. During the test,we used high-definition camera to record the failure characteristics of ubiquitous jointed specimens. We divided the specimen's failure modes into three types: plane shear failure,quasi-integrity shear failure and oblique shear failure. The results show that the joint spacing can change the failure mode of specimens and the joint inclination determines the failure mode of specimens. Then,we analyzed the peak shear strength of specimens with different joint parameters. The results show that the weaken degree of ubiquitous joint on the shear strength reaches 15.95% ~56.62%. The peak shear strength of jointed specimens gradually increased with the joint spacing's increase,and had the first increase and then decrease trend with the increase of the joint inclination. In addition,we used the acoustic emission(AE)device to monitor the specimens' loading process in real time to analyze the AE characteristics of specimens with different joint parameters. During the compaction phase,the AE maximum impact number for jointed specimens increases as the joint spacing decreases. For the AE energy characteristics of specimens,the peak energy of jointed specimens decreases with the joint spacing's decrease,but the mean energy increases with joint spacing's decrease. As the joint inclination increases,the jointed specimens' peak energy and mean energy both increase first and then decrease.

       

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