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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第12卷    第5期    总第68期    2015年10月

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文章编号:1672-7029(2015)05-1064-10
石英云母片岩力学性质各向异性的模拟方法探讨
崔臻1, 2,侯靖2,盛谦1,张伟2,周勇2

(1. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉 430071;
2. 中国电建集团华东勘测设计研究院有限公司,浙江杭州 310014
)

摘 要: 针对丹巴水电工程中的石英云母片岩力学性质的各向异性问题,以专门的多角度加载室内试验数据为标定依据,对离散元方法、合成岩体方法和基于节理岩体的连续介质方法3种可以描述岩石力学各向异性的数值模拟方法的适用性分别进行详细讨论。室内试验结果表明:石英云母片岩的变形、强度及破坏形态均随加载方向变化而改变,以加载方向与片理面斜交时最弱。3种数值模拟方法均能有效从数值方法角度模拟石英云母片岩力学特性的各向异性特征,但各自具有不同的特点与适用范围。根据讨论结果,选取计算效率较高的基于节理岩体模型的连续介质方法对CPD-1探洞进行开挖模拟。模拟结果与实际监测得到的围岩松动圈分布相符合,正确体现了石英云母片岩中片理面对围岩破坏模式及位置的控制性作用。

 

关键字: 岩石力学;各向异性;节理岩体模型;合成岩体技术;离散元

A discussion on the numerical simulation of mechanicalproperties’ anisotropy of Danba quartz mica schist
CUI Zhen1, 2, HOU Jing2, SHENG Qian1, ZHANG Wei2, ZHOU Yong2

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics,
Chinese Academy of Sciences, Wuhan 430071, China;
2. PowerChina Huadong Engineering Corporation Limited, Hangzhou 310014, China

Abstract:The nature of anisotropy in quartz mica schist is an essential rock mechanics problem which needs to be seriously addressed during the design phase of Danba hydropower project. Firstly, a set of specially designed multi-angle UCTs was conducted as a baseline calibration, based on which three numerical simulation methods for anisotropy were demonstrated and discussed respectively, e.g. The discrete element method, synthetic rock mass method and joined-rockmass-constitutive-model-based continuum method. The result indicates that the deformation of the strength and failure model varies with the loading angle, and the rock proves its weakest property in the oblique direction. And the anisotropy of deformation and strength of the rock can be preferably expressed by the three method in numerical calculation, despite they may have their respectively advantages and disadvantages. Ultimately, the joined-rockmass-constitutive-model-based continuum method was adopted to perform an excavation simulation of the exploratory tunnel CPD-1. The simulated failure zone is highly accord with tested sonic relaxation zone. Therefore the dominate effect of the schistosity plane on the failure mode and location is raveled.

 

Key words: rock mechanics; anisotropy; jointed rock mass model; synthetic rock mass method; discrete element method

ISSN 1672-7029
CN 43-1423/U

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