基于高速摄影的单预制裂纹大理岩加卸载试验

发布时间：2018-01-30 17:11

本文关键词： 岩石力学加卸载高速摄影大理岩预制裂纹断裂力学　出处：《中国矿业大学学报》2014年05期 　论文类型：期刊论文

【摘要】：为了研究裂纹缺陷对岩石材料强度、变形特性以及断口走向的影响,以大理岩中预制45°单裂纹试件的单轴、双轴加载以及卸载试验为基础,通过高速摄影设备记录试件破坏主要过程及破裂面的走向,分析加、卸载下裂隙岩体的裂纹起裂、扩展及破坏模式.结果表明:3种加载条件下与裂纹面夹角为-100°~-130°区域容易产生主要裂纹,在理论上与剪应力极值方向-115°基本吻合;新产生的裂纹多数为裂纹带形式,这是由于加卸载过程中裂纹尖端的最大环向拉应力和剪应力极值的大小及角度渐变造成.卸载试验最终的破坏形态比单轴和双轴加载更为复杂,破坏形式由卸载初剪切破坏发展为拉剪破坏,破坏程度和速度均高于加载.
[Abstract]:In order to study the effect of crack defects on the strength, deformation characteristics and fracture direction of rock materials, uniaxial, biaxial loading and unloading tests of prefabricated 45 掳single crack specimens in marble were carried out. The fracture initiation of fractured rock mass under loading and unloading is analyzed by recording the main failure process and fracture surface strike of the specimen by high-speed photography equipment. The results show that the main cracks are easily produced in the region of -100 掳-130 掳with the angle of -100 掳~ 130 掳under three loading conditions. Theoretically, it coincides with the direction of the extreme value of shear stress (-115 掳). Most of the new cracks are in the form of crack bands. This is due to the gradient of the maximum toroidal tensile stress and shear stress extremum of the crack tip during loading and unloading. The ultimate failure mode of the unloading test is more complex than that of uniaxial and biaxial loading. The failure form develops from initial shear failure to tensile shear failure, and the failure degree and speed are higher than that of loading.
【作者单位】：中国矿业大学(北京)理学院;中国矿业大学(北京)力学与建筑工程学院;中海油能源发展股份有限公司工程技术分公司;
【基金】：国家重点基础研究发展计划(973)项目(2010CB732002) 中央高校基本科研业务费专项资金项目(2009QS01)
【分类号】：TU452
【正文快照】： isting crack;fracture mechanics岩体作为一种混合介质,经历了复杂而漫长的地质构造作用而形成,是工程领域中应用最为广泛的工程材料之一.岩体的特性同巷道稳定性、边坡失稳等现象关系密切,也是安全生产、施工过程中一个重要的影响因素,特别是裂隙岩体.裂隙岩体内部含有诸多

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