林冠宇, 赵其华, 王晨辉, 何云松, 胡广. 2018: 循环加卸载条件下花岗岩破坏过程声发射特征研究. 工程地质学报, 26(2): 475-483. DOI: 10.13544/j.cnki.jeg.2017-136
    引用本文: 林冠宇, 赵其华, 王晨辉, 何云松, 胡广. 2018: 循环加卸载条件下花岗岩破坏过程声发射特征研究. 工程地质学报, 26(2): 475-483. DOI: 10.13544/j.cnki.jeg.2017-136
    LIN Guanyu, ZHAO Qihua, WANG Chenhui, HE Yunsong, HU Guang. 2018: STUDIES ON ACOUSTIC EMISSION CHARACTERISTICS OF CYCLIC LOADING-UNLOADING GRANITE FAILURE. JOURNAL OF ENGINEERING GEOLOGY, 26(2): 475-483. DOI: 10.13544/j.cnki.jeg.2017-136
    Citation: LIN Guanyu, ZHAO Qihua, WANG Chenhui, HE Yunsong, HU Guang. 2018: STUDIES ON ACOUSTIC EMISSION CHARACTERISTICS OF CYCLIC LOADING-UNLOADING GRANITE FAILURE. JOURNAL OF ENGINEERING GEOLOGY, 26(2): 475-483. DOI: 10.13544/j.cnki.jeg.2017-136

    循环加卸载条件下花岗岩破坏过程声发射特征研究

    STUDIES ON ACOUSTIC EMISSION CHARACTERISTICS OF CYCLIC LOADING-UNLOADING GRANITE FAILURE

    • 摘要: 本文通过MTS815岩石力学试验机,开展循环荷载作用下花岗岩破坏过程声发射参数变化的研究,研究了花岗岩在不同围压、循环次数、含水率的条件下声发射参数的变化情况。基于记录到的声发射数据,将岩石破坏过程划分为3个阶段,即初始阶段、匀速增长阶段、加速跃迁阶段,研究各阶段的RA值、损伤参数D、Kaiser效应的变化特征。试验结果表明:(1)饱水岩石的RA值小于天然状态下岩石的RA值,并且岩石破坏前(加速跃迁阶段)有较为明显的高RA区出现。(2)围压能有效延长加速跃迁阶段的时间,同时提高岩石的抗压强度。(3)损伤参数D在最后一级循环时抬升平均值达到0.6。(4)验证了岩石Kaiser效应的局限性,岩石在出现了Felicity效应后才会因累计损伤发生破坏。

       

      Abstract: This paper studies on the variation of acoustic emission(AE)characteristics during granite failure under cyclic loading through the MTS815 rock mechanics testing system. Changes of AE parameters of granite were studied under different confining pressure, cycle times and water content. Based on the recorded AE data, the rock failure process is divided into three stages, namely, the initial stage, uniform development stage and the acceleration transition stage. The variation characteristics of RA value, damage parameter D and Kaiser Effect in each stage are studied. The results show that:(1)The RA value of the saturated rock is less than the RA value of the rock in the natural state, and the rocks of both states appear obvious high RA zone before failure. (2)The confining pressure can effectively prolong the time of the accelerating transition phase and improve the compressive strength of the rock.(3)The average value of the damage parameter D in the last cycle is increased by 0.6. (4)The limitation of the rock Kaiser effect is verified, and the rock will not be destroyed by the cumulative damage after the Felicity Effect occurs.

       

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