基于声发射特征的覆岩采动裂隙演化规律研究

发布时间：2018-04-26 13:46

本文选题：覆岩 + 采动裂隙　；参考：《西安科技大学学报》2017年02期

【摘要】：为研究覆岩采动裂隙演化过程能量释放规律,以构建的实验条件为基础,采用物理相似模拟、理论分析的方法,结合声发射技术,对覆岩采动裂隙演化过程中声发射特征进行了探讨。结果表明,采动裂隙演化过程是一个复杂的能量释放过程,模型开挖初期,覆岩损伤较小,声发射现象不明显,岩层移动变化较小,仅产生离层裂隙;在模型开挖中期,声发射现象越来越显著,即释放能量随来压次数显著升高,此时破断裂隙在纵向及横向不断发展;随着模型继续开挖,周期来压阶段内,声发射次数逐渐稳定,释放能量趋于稳定,此时破断裂隙纵向不再发展,仅随模型开挖在横向方向发展。
[Abstract]:In order to study the law of energy release during the process of mining fracture evolution in overburden rock, based on the established experimental conditions, the method of physical similarity simulation, theoretical analysis and acoustic emission technique are adopted. The characteristics of acoustic emission during the evolution of mining fractures in overlying rocks are discussed. The results show that the evolution process of mining fracture is a complex process of energy release. In the early stage of model excavation, the overburden rock damage is small, the acoustic emission phenomenon is not obvious, the rock layer movement change is small, and only the fissures are produced in the middle period of model excavation. The phenomenon of acoustic emission is becoming more and more obvious, that is, the energy release increases significantly with the times of pressure, and the fracture fracture develops continuously in the longitudinal and lateral direction, and the number of acoustic emission is gradually stable during the period of periodic pressure with the model excavating. The released energy tends to be stable, and the longitudinal fracture is no longer developed, but only develops in the lateral direction with the excavation of the model.
【作者单位】：西安科技大学能源学院;
【基金】：国家自然科学基金科学仪器基础研究专款(51327007) 国家自然科学青年基金(51304156)
【分类号】：TD712.6

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