不同含水率泥质粉砂岩破裂声发射特性试验研究

发布时间：2018-03-29 05:13

本文选题：岩石力学　切入点：泥质粉砂岩　出处：《地下空间与工程学报》2017年03期

【摘要】：以干燥、自然和饱和含水3种典型状态的泥质粉砂岩为研究对象,进行单轴压缩破坏全程声发射检测试验,研究了3种状态下岩石破裂的力学和声发射特性的不同。研究结果表明:含水使得泥质粉砂岩软化,且峰值应力和弹性模量均随含水率的增加而减小,变形特征由脆性逐渐向延性转化;声发射累计事件数、声发射事件率峰值、声发射累计绝对能量、声发射绝对能率峰值等声发射参数均随含水率的增加而减少,即含水使得泥质粉砂岩损伤破裂程度减小,破裂全程能量释放水平降低;根据试验所得声发射累计事件数和累计绝对能量随时间变化曲线,得出含水率使得泥质粉砂岩由"突发型"的脆性破坏向"平稳型"的延性破坏过渡。
[Abstract]:Taking the argillaceous siltstone with dry, natural and saturated water content as the research object, the acoustic emission test of the whole process of uniaxial compression failure was carried out. The differences of mechanical and acoustic emission characteristics of rock fracture in three different states are studied. The results show that water content softens argillaceous siltstone, and the peak stress and elastic modulus decrease with the increase of water content. The deformation characteristics gradually change from brittleness to ductility, the number of cumulative AE events, the peak value of AE event rate, the accumulative absolute energy of AE and the peak value of AE absolute energy are all decreased with the increase of water content. That is, water content reduces the damage and rupture degree of argillaceous siltstone and decreases the energy release level during the whole process of rupture, according to the cumulative number of acoustic emission events and the cumulative absolute energy variation curve with time, It is concluded that the water content makes the shaly siltstone transition from the brittle failure of the burst type to the ductile failure of the stable type.
【作者单位】：中国矿业大学(北京)资源与安全工程学院;华北理工大学矿业工程学院;中国核工业集团地质矿产事业部;
【基金】：国家级大学生创新创业训练计划项目(201210081001) 河北省教育厅自然科学基金(QN2014067) 教育部高校博士学科专项科研基金(20120023110023) 中央高校基本科研业务费专项资金资助(2014QZ03)
【分类号】：TU45

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