| 不同节理粗糙度类岩石材料三轴压缩力学特性试验研究 |
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| 引用本文： | 杨圣奇,陆家炜,田文岭,唐劲舟.不同节理粗糙度类岩石材料三轴压缩力学特性试验研究[J].岩土力学,2018,39(Z1):21-32. |
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| 作者姓名： | 杨圣奇 陆家炜 田文岭 唐劲舟 |
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| 作者单位： | 1. 中国矿业大学 深部岩土力学与地下工程国家重点实验室，江苏 徐州 221116；2. 中国矿业大学 力学与土木工程学院，江苏 徐州 221116 |
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| 基金项目： | ：国家自然科学基金项目（No. 51734009；No. 51179189）；江苏省杰出青年基金项目（No. BK20150005）；江苏省第五期“333工程”培养资金资助项目（2016年）。 |
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| 摘 要： | 粗糙度是影响节理岩体强度与变形特性的重要因素之一。首先使用3D 打印机制作模具，并浇筑形成不同粗糙度（节理粗糙度系数JRC=2、7、12、17、22）的节理岩石试样。采用GCTS高温高压动静岩石三轴试验系统，对含有不同粗糙度节理岩石试样进行了三轴压缩试验，获得了不同粗糙度节理岩石试样的三轴应力–应变曲线，分析了JRC对岩石三轴强度和变形特性的影响规律，在三轴加载过程中采用声发射测试系统，分析了不同粗糙度节理岩石试样的声发射特性。运用数字三维视频显微系统观察节理面形态，讨论了不同围压下节理岩石试样峰值强度与JRC之间的关系。研究结果表明，节理面的存在直接导致节理岩石试样强度的大幅度降低，JRC对岩石破坏裂纹的形态、数量和空间分布特征亦有很大的影响，随着JRC值的增大，岩石节理面的抗剪强度增大，岩石试样的三轴抗压强度也会增大，岩石试样由脆性破坏转变为延性破坏。
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| 关 键 词： | 节理粗糙度系数 强度特征 变形特性 声发射 |
| 收稿时间： | 2017-11-17 |
Experimental study of mechanical behavior of rock specimens with different joint roughness coefficient under conventional triaxial compression |
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| YANG Sheng-qi,LU Jia-wei,TIAN Wen-ling,TANG Jin-zhou.Experimental study of mechanical behavior of rock specimens with different joint roughness coefficient under conventional triaxial compression[J].Rock and Soil Mechanics,2018,39(Z1):21-32. |
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| Authors: | YANG Sheng-qi LU Jia-wei TIAN Wen-ling TANG Jin-zhou |
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| Institution: | 1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China; 2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China |
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| Abstract: | Roughness is one of the important factors that affect the strength and deformation characteristics of jointed rock mass. In this paper, 3D printer has been employed to making molds firstly, and casting the different roughness joint rock specimens(joint roughness coefficient JRC = 2, 7, 12, 17 and 22). Triaxial compression tests are carried out on rock specimens with different roughness joints by using GCTS triaxial rock testing system of high temperature, high pressure and dynamic-static coupling loading to obtain the triaxial stress-strain curves. Then, based on the curves, we analyze the influence of JRC on the triaxial compressive strength and deformation characteristics of rock. At the same time, acoustic emission test system has been adopted to reveal the acoustic emission characteristic of the different roughness jointed rock specimens in the process of triaxial compression tests. Finally, the morphology of the joint surface is observed by digital three-dimensional video microscopy system, and the relationship between the peak strength of jointed rock specimens and JRC under different confining pressures has been discussed. The results show that the presence of joint results in a significant reduction in the strength of the joint rock specimen; JRC also has great influence on the morphology, quantity and spatial distribution characteristics of failure crack of rock. With the increase of the JRC value, the shear strength of rock joint increase, the triaxial compressive strength also increase, the rock specimen will changed from brittle failure to ductile failure. |
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| Keywords: | joint roughness coefficient(JRC) strength characteristic deformation characteristics acoustic emission |
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