云母石英片岩片理面力学特征试验研究
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摘要
云母石英片岩的矿物成分和微观结构决定了其各向异性特征,通过铸体磨片和电镜扫描试验,获得了云母石英片岩的矿物组成和微观结构特征;通过三轴剪切试验,获得了微风化岩样片理面力学参数;通过强风化和中风化岩块的点荷载试验,结合强风化岩样的片理面剪切试验,得出了强风化和中风化岩样的片理面力学参数;按照材料力学理论,采用片理面力学参数计算得出岩样的最小单轴抗压强度,进而计算得出岩样的各向异性系数;以垂直片理面的抗压强度作为计算依据,计算得出岩样的风化系数,进而总结出岩样的各向异性系数与风化系数的关系,揭示了风化过程中片理面力学特征的变化规律。
The mineral composition and microstructures of mica quartz schist determine its anisotropic characteristics. The mineral composition and microstructural characteristics of mica quartz schist are obtained by using the casting abrasive test and the scanning electron microscopy. Through the triaxial shear tests, the mechanical parameters of foliation surface of slightly weathered rock samples are obtained. Through the point load tests on strongly weathered and moderately weathered rock blocks,combined with the shear tests on foliation surface of strongly weathered rock samples, the mechanical parameters of schistose plane of strong weathering and medium weathering rock samples are obtained. According to the theory of material mechanics,the minimum uniaxial compressive strength of the rock samples is obtained by calculating the mechanical parameters of foliation surface, and then the anisotropic coefficient of the rock samples is calculated. Based on the compressive strength of vertical foliation surface, the weathering coefficient of the rock samples is calculated, and the relationship between the anisotropy coefficient and the weathering coefficient of the rock samples is summarized, and the variation laws of mechanical characteristics of foliation surface in weathering process are revealed.
The mineral composition and microstructures of mica quartz schist determine its anisotropic characteristics. The mineral composition and microstructural characteristics of mica quartz schist are obtained by using the casting abrasive test and the scanning electron microscopy. Through the triaxial shear tests, the mechanical parameters of foliation surface of slightly weathered rock samples are obtained. Through the point load tests on strongly weathered and moderately weathered rock blocks,combined with the shear tests on foliation surface of strongly weathered rock samples, the mechanical parameters of schistose plane of strong weathering and medium weathering rock samples are obtained. According to the theory of material mechanics,the minimum uniaxial compressive strength of the rock samples is obtained by calculating the mechanical parameters of foliation surface, and then the anisotropic coefficient of the rock samples is calculated. Based on the compressive strength of vertical foliation surface, the weathering coefficient of the rock samples is calculated, and the relationship between the anisotropy coefficient and the weathering coefficient of the rock samples is summarized, and the variation laws of mechanical characteristics of foliation surface in weathering process are revealed.
引文
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[2]单治钢,陈国庆,周春宏,等.丹巴水电站石英云母片岩力学特性及岩体质量分类[J].岩石力学与工程学报,2013,32(10):2070-2078.(SHAN Zhi-gang,CHEN Guo-qing,ZHOU Chun-hong,et al.Quartz mica schist mechanical properties and rock mass quality classification of Danba Hydropower Station[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(10):2070-2078.(in Chinese))
[3]JTG E40-2007公路土工试验规程[S].(JTG E40-2007Highway geotechnical test code[S].(in Chinese))
[4]王家兴,石豫川,段伟锋,等.基于微观试验的片岩力学特性研究[J].现代隧道技术,2014,51(3):73-78.(WANGJia-xing,SHI Yu-chuan,DUAN Wei-feng,et al.Study on mechanical properties of schist based on micro-test[J].Modern Tunnel Technology,2014,51(3):73-78.(in Chinese))
[5]杨帆,侯克鹏,谢永利.强风化云母石英片岩力学参数确定方法[J].长安大学学报(自然科学版),2012,32(2):29-33,38.(YANG Fan,HOU Ke-peng,XIE Yong-li.Method for determining mechanical parameters of strongly weathered mica quartz schist[J].Journal of Chang'an University(Natural Science Edition),2012,32(2):29-33,38.(in Chinese))
[6]张宇,干泉,余飞,等.基于点荷载试验武当群片岩的风化分组及强度特性研究[J].岩土力学,2012,33(增刊1):229-232.(ZHANG Yu,GAN Quan,YU Fei,et al.Weathering grouping and strength characteristics of Wudang Group schist based on point load test[J].Rock and Soil Mechanics,2012,33(S1):229-232.(in Chinese))