【作者】 周宏伟； 左建平； 王驹； 刘月妙；

【Author】 ZHOU Hong-wei~(1,2) ZUO Jian-ping~(1,2) WANG Ju~3 LIU Yue-miao~3 (1. Institute of Rock Mechanics and Fractals, School of mechanics & civil engineering, China University of Mining and Technology, Beijing 100083, China; 2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, China; 3. Beijing Research Institute of Uranium Geology, Beijing 100029, China)

【机构】 中国矿业大学(北京)岩石力学与分形研究所； 中国矿业大学煤炭资源与安全开采国家重点实验室； 核工业北京地质研究院；

【摘要】 核废料深埋处置和深部采矿中,研究温度对岩石物理及力学特性的影响具有很重要的意义。本文通过大量实验对对北山花岗岩进行了不同温度影响后的细观破坏实验研究,得出试件包含的较大尺寸的原生缺陷和矿物颗粒对花岗岩的断裂路径影响较大,且试件断口的分布具有很大的分散性,这表明微裂纹的萌生、扩展和贯通受多方面的作用。裂纹扩展方向主要受主应力控制,同时也受局部矿物颗粒的影响,如沿矿物颗粒界面、晶界或沿解理穿晶扩展,向有原始孔洞和裂纹处发展等。本文还给出了温度与北山花岗岩强度之间的关系,发现强度具有随温度的升高而先上升再下降的趋势。更多还原

【Abstract】 The research on rock mechanical behavior under thermal-mechanical coupling effects plays an important role in geological disposal of nuclear waste and deep mining.A number of experiments have been carried out to investigate the effects of temperature on Beishan granite in the paper.Experimental results indicate that the effects of pre-existing crack and mineral grains on fracture path of granite are very important. `The distribution of fracture position appears to be random.And the initiation,propagation and converge of micro cracks are affected by several factors.Normally,the propagation is mainly affected by the main stress. In addition,it is also affected by local mineral grains,such as the interface failure along the mineral grain, transgranular fracture,intergranular fracture.The relationship between temperature and strength of Beishan granite is also presented.It indicates that the strength increases with the increasing temperature at a lower temperature,but decrease with the increasing temperature at a higher temperature.更多还原