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。
The uniaxial compressive and the acoustic emission ( AE ) tests have been taken on different moisture of argillaceous siltstone, including the state of dry, natural and saturated. The difference of rock rupture mechanics characteristics and AE characteristics on three moisture contents has been developed. The results show that the presence of water makes argillaceous siltstone softening damage intensity, the peak stress and elastic modulus decrease with the increase of the water content, the characteristic of deformation transfer form brittle to ductile; AE accumulative events, AE events rate peak, AE accumulative absolute energy and AE absolute energy rate peak decrease with the increase of the water content, namely the presence of water makes the damage or broken degree of argillaceous siltstone decrease, and the energy release level in whole failure of rock reduce ; According to the curves of AE accumulative events and AE accumulative absolute energy changing with time, it turns out that the presence of water makes the failure of argillaceous siltstone transfer form the brittle type of sudden to the ductile of stable.
出处
《地下空间与工程学报》
CSCD
北大核心
2017年第3期591-597,共7页
Chinese Journal of Underground Space and Engineering
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)
关键词
岩石力学
泥质粉砂岩
不同含水率
声发射
绝对能量
rock mechanics
argillaceous sihstone
different water moisture
acoustic emission
absolute energy