裂隙岩石应力松弛特性及声发射试验  

Stress Relaxation Characteristics and Acoustic Emission Experiment of Fractured Rock

作　　者：张默涵 俞缙[1] 常旭 刘士雨[1] 涂兵雄[1] ZHANG Mohan;YU Jin;CHANG Xu;LIU Shiyu;TU Bingxiong(Fujian Research Center for Tunneling and Urban Underground Space Engineering Technology,Huaqiao University,Xiamen 361021,China)

机构地区：[1]华侨大学福建省隧道与城市地下空间工程技术研究中心,福建厦门361021

出　　处：《华侨大学学报（自然科学版）》2023年第5期574-581,共8页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(42077254,51874144);福建省科技计划引导性项目(2020H0014,2020Y0029)。

摘　　要：为探究裂隙岩石的应力松弛特性及失稳破坏特征对工程长期稳定和安全的影响,利用TFD-2000/D型岩石动态扰动伺服三轴试验系统和DS5-16B型全信息声发射仪,对完整岩石和不同倾角裂隙岩石进行单轴逐级加载应力松弛声发射试验.结果表明:相同条件下,裂隙岩石的峰值轴向应力比完整岩石的低,且随着倾角的增大,轴向峰值应力也随之增大;完整岩石和裂隙岩石的应力松弛度和初始应力松弛速率均随着应变的增大呈现先增大后减小的趋势;根据松弛速率的快慢,把松弛过程分为快速松弛阶段和慢速松弛阶段;在加载段和松弛过程中均存在着声发射信号,声发射特征值可以作为一种有效的信息判断岩石的破坏情况.In order to explore the effects of stress relaxation characteristics and instability failure characteristics of fractured rock on the long-term stability and safety of the project,using the TFD-2000/D type rock dynamic disturbance servo triaxial test system and DS5-16B type full information acoustic emission instrument,uniaxial step loading stress relaxation acoustic emission tests were carried out on intact rock and fractured rock with different inclination angles.The results show that:under the same conditions,the peak axial stress of fractured rock is lower than that of intact rock,and as the inclination angle increases,the peak axial stress also increases.The stress relaxation degree and the initial stress relaxation rate of intact rock and fractured rock firstly increase and then decrease with the increase of strain.According to the rate of relaxation,the relaxation process is divided into fast relaxation stage and slow relaxation stage.There are acoustic emission signals in loading stage and relaxation process.Acoustic emission characteristic values can be regarded as an effective information to judge the failure condition of rock.

关 键 词：裂隙岩石 不同倾角 应力松弛 振铃计数 破坏特征 

分 类 号：TU432[建筑科学—岩土工程]