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采用等效岩体技术,将岩体中的岩块和节理分别用颗粒体模型和光滑节理模型描述,从细观角度开展了人工预制含两条断续节理岩石试件力学特性及破裂机制的研究。同时,结合室内试验研究成果,通过计算与试验结果的对比分析,验证了等效岩体技术在断续节理岩体力学特性研究中的适宜性和可靠性。主要研究结果如下:(1)随着断续节理产状的不同,虽可将宏观破裂划分为剪切模式、翼型张拉模式和混合模式等3种类型,但从细观角度看,颗粒间张拉型微破裂均是引起各类宏观破裂模式的主要诱因。(2)在试样达到抗压强度前,破裂声发射事件次数较少,强度均较低,主要孕育于断续节理尖端处,并沿两断续节理尖端的连线在岩桥区域累积贯通。(3)在试样达到抗压强度后,破裂声发射事件次数迅速增加,且破裂强度有所提高。(4)各类试样中,声发射事件累积数和破裂强度之间均近似满足Doseresp生长函数关系。
By using the equivalent rock mass technology, the rock mass and joint in the rock mass are described by using the granular body model and the smooth joint model, respectively. The mechanical properties and the fracture mechanism of the rock prefabricated with two intermittent jointed rock specimens the study. At the same time, combining with the results of laboratory experiments, the validity and reliability of equivalent rock mass technology in the study of mechanical properties of discontinuous jointed rock mass are verified by the comparative analysis between calculation and test results. The main results are as follows: (1) With the different shapes of intermittent joints, macroscopic rupture can be divided into three types: shear mode, airfoil tension mode and mixed mode. However, from the microscopic point of view, Tension between the micro-cracks are caused by various types of macro-rupture of the main incentives. (2) Before the specimen reaches the compressive strength, the number of acoustic emission events of rupture is less and the intensity is lower, which is mainly conceived at the tip of intermittent joints and accumulated along the connection of two intermittent joints in the rock bridge area . (3) After the specimen reaches the compressive strength, the number of acoustic emission events rapidly increases and the breaking strength increases. (4) In all kinds of samples, the cumulative number of AE events and the rupture strength all satisfy the relationship of Doseresp growth function.