单轴压缩下含层理加锚岩石力学特性研究

发布时间：2018-11-12 06:59

【摘要】：为分析锚固方式和层理对加锚岩石力学特性影响规律,采用相似材料预制含层理岩石,室内钻取0°和90°层理标准试件,以45号钢加工而成的螺杆模拟锚杆,分别对试件进行端部锚固和全长锚固,从而得到不加锚杆、端部锚固、全长锚固3种试件,而后在MTS815岩石力学试验系统上对试件进行单轴压缩试验分析其变形、强度特征。结果表明:锚杆可提高岩石的强度,且层理方向和锚固方式影响其对强度的提高幅度。层理相同的加锚试件,全长锚固下岩石的抗压强度提高幅度大于端部锚固岩石;同一锚固方式下,90°层理加锚试件的单轴抗压强度提高幅度大于0°层理加锚试件。锚固方式不同,加锚试件的破坏形式亦有所差别。根据锚固方式不同,可将破坏形式分为剪切拉伸和剪切错断2种。锚固方式对加锚试件锚杆失效模式无影响,二者均表现为岩体与灌浆界面滑脱,但全长锚固与端部锚固所不同的是,全长锚固锚杆与岩石粘结长度更大,粘结强度更高,失效时可带出更多、更厚的岩石碎屑。
[Abstract]:In order to analyze the influence of anchoring mode and bedding on mechanical properties of anchored rock, similar materials were used to preform bedded rock, 0 掳and 90 掳standard specimens of bedding were drilled in laboratory, and screw bolt was made of 45 # steel. The end anchoring and full-length anchoring of the specimens were carried out respectively to obtain three kinds of specimens without anchor rod, end anchoring and full-length anchoring. The deformation and strength characteristics of the specimens were analyzed by uniaxial compression test on MTS815 rock mechanics test system. The results show that the strength of rock can be improved by the bolt, and the direction of bedding and the anchoring mode affect the strength of rock. The compressive strength of the rock under full-length Anchorage is greater than that of the end anchoring specimen with the same bedding, and the uniaxial compressive strength of the 90 掳bedding Anchorage specimen with the same Anchorage mode is greater than that of the 0 掳bedding Anchorage specimen. With different anchoring methods, the failure modes of the specimens are also different. According to the different anchoring modes, the failure forms can be divided into two types: shear tensile and shear fault. The anchoring mode has no effect on the failure mode of anchor rod, both of which are the slip between rock mass and grouting interface, but the full-length Anchorage is different from the end Anchorage, the length of the anchoring bolt is longer and the bond strength is higher than that of the full-length Anchorage bolt. More and thicker rock debris can be brought out when failure occurs.
【作者单位】：重庆大学煤矿灾害动力学与控制国家重点实验室;重庆大学资源及环境科学学院;
【基金】：煤矿灾害动力学与控制国家重点实验室自主课题重点项目(No.2011DA105287-ZD201504)~~
【分类号】：TU45

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