页岩巴西劈裂试验的能量分布与临界特征分析
发布时间：2018-11-28 16:10
【摘要】：为了清晰了解具有脆性破坏特征的页岩在拉伸破坏下的能量统计分布特征,研究整体破坏能量分布与局部应力下的能量统计分布规律,从而为现场压裂机制提供理论依据。选取四川盆地南部地区龙马溪组钙质页岩进行巴西劈裂(间接拉伸)的声发射试验,加载速率分别为0.005,0.05,0.5 mm/min。结果表明:(1)在各个加载速率下岩石破坏过程的能量概率密度函数符合幂定律分布,并遵循时间上的幂律无尺度分布。(2)局部应力下的能量概率密度函数也符合幂定律分布,与幂值分布图变化规律形成良好对应,各局部应力阶段下的能量概率分布曲线向着整体破坏的能量概率分布曲线流动。(3)当应力σ达到0.9σmax,系统进入临界态,能量分布曲线与幂值分布曲线接近于整体破坏过程中的能量分布曲线与幂值分布曲线,并逐渐重合。(4)试验结果与纤维束模型数值模拟结果相符,当应力σ达到试件破坏应力的90%后,分叉率ξ急剧增大,直至岩石破坏,能良好验证临界态特性。
[Abstract]:In order to clearly understand the energy statistical distribution characteristics of shale with brittle failure characteristics under tensile failure, the distribution of whole failure energy and local stress is studied, which provides a theoretical basis for the field fracturing mechanism. Acoustic emission tests of Brazilian fracturing (indirect stretching) of calcareous shale of Longmaxi formation in the southern part of Sichuan Basin were carried out at the loading rate of 0.005 0. 05 mm/min. and 0. 05 mm/min., respectively. The results show that: (1) the energy probability density function of rock failure process at different loading rates obeys the power law distribution. The energy probability density function under local stress also obeys the power law distribution, which corresponds well with the law of power distribution, and follows the scale-free distribution of power law in time. (2) the energy probability density function under local stress also obeys the power law distribution. The energy probability distribution curves at each local stress stage flow to the whole failure energy probability distribution curves. (3) when the stress 蟽 reaches 0. 9 蟽 max, system, the critical state is obtained. The energy distribution curve and the power value distribution curve are close to the power distribution curve in the whole failure process, and gradually coincide. (4) the experimental results agree with the numerical simulation results of the fiber bundle model. When the stress 蟽 reaches 90% of the failure stress of the specimen, the bifurcation rate 尉 increases sharply until the rock failure, and the critical state characteristics can be well verified.
【作者单位】： 重庆大学煤矿灾害动力学与控制国家重点实验室;西南大学地理科学学院;
【基金】：国家自然科学基金青年基金资助项目(51304256) 高等学校博士学科点专项科研基金资助课题资助项目(20130191130003) 国家重点基础研究发展计划资助项目(2014CB239204)
【分类号】：TD315
[Abstract]:In order to clearly understand the energy statistical distribution characteristics of shale with brittle failure characteristics under tensile failure, the distribution of whole failure energy and local stress is studied, which provides a theoretical basis for the field fracturing mechanism. Acoustic emission tests of Brazilian fracturing (indirect stretching) of calcareous shale of Longmaxi formation in the southern part of Sichuan Basin were carried out at the loading rate of 0.005 0. 05 mm/min. and 0. 05 mm/min., respectively. The results show that: (1) the energy probability density function of rock failure process at different loading rates obeys the power law distribution. The energy probability density function under local stress also obeys the power law distribution, which corresponds well with the law of power distribution, and follows the scale-free distribution of power law in time. (2) the energy probability density function under local stress also obeys the power law distribution. The energy probability distribution curves at each local stress stage flow to the whole failure energy probability distribution curves. (3) when the stress 蟽 reaches 0. 9 蟽 max, system, the critical state is obtained. The energy distribution curve and the power value distribution curve are close to the power distribution curve in the whole failure process, and gradually coincide. (4) the experimental results agree with the numerical simulation results of the fiber bundle model. When the stress 蟽 reaches 90% of the failure stress of the specimen, the bifurcation rate 尉 increases sharply until the rock failure, and the critical state characteristics can be well verified.
【作者单位】： 重庆大学煤矿灾害动力学与控制国家重点实验室;西南大学地理科学学院;
【基金】：国家自然科学基金青年基金资助项目(51304256) 高等学校博士学科点专项科研基金资助课题资助项目(20130191130003) 国家重点基础研究发展计划资助项目(2014CB239204)
【分类号】：TD315
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