不同裂隙角度岩石相似试样力学特性及声发射特性研究
Study on Mechanical Properties and Acoustic Emission Characteristics of Similar Specimens of Rocks with Different Fracture Angles
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摘要: 为了研究岩石相似材料在不同倾角预制裂隙影响下的力学特性的变化规律,利用河沙、水泥、石膏等材料制作岩石相似试样,并对制作成功的岩石相似试样制作不同角度的裂隙,最终对含不同倾角的试样进行单轴压缩试验,研究其力学特性的变化规律。研究得到含有预制裂隙试样的峰值强度随裂隙倾角的增大呈对数关系增长;同时其峰值应变随裂隙倾角的增大呈指数关系增长;含预制裂隙试样的AE事件累计数及能量强度大致变化趋势相近,可分为压实萌生阶段、弹性稳定增长阶段、破坏剧烈增长阶段;AE事件累计数随着预制裂隙倾角的增大不断增大,能量强度也随着预制裂隙倾角的增大不断增大。Abstract: In order to study the variation of mechanical properties of rock-like materials under the influence of prefabricated cracks with different dip angles, rock-like samples were made from river sand, cement, gypsum and other materials, and cracks of different angles were made for the similar rock samples. Uniaxial compression experiments were carried out on samples with different inclination angles to study the variation of mechanical properties. The peak intensity of the specimen with pre-formed cracks increases logarithmically with the the increase dip angle of the fracture. At the same time, the peak strain increases exponentially with the increase dip angle of the fracture. The cumulative count of AE event and the energy intensity of the pre-formed fracture specimens are similar. It is divided into three stages: the compaction initiation stage, the elastic stablity growth stage, and the destruction of the sharp growth stage. And the cumulative count of AE event increases with the increase of the inclination angle, and the energy intensity also increases with the increase of the inclination angle.
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