郑达, 巨能攀. 2011: 千枚岩岩石微观破裂机理与断裂特征研究. 工程地质学报, 19(3): 317-322.
    引用本文: 郑达, 巨能攀. 2011: 千枚岩岩石微观破裂机理与断裂特征研究. 工程地质学报, 19(3): 317-322.
    ZHENG Da, JU Nengpan. 2011: SCANNING ELECTRONIC MICROSCOPE TESTS FOR ROCK MICRO-RUPTURE MECHANISM AND FRACTURE CHARACTERISTIC OF PHYLLITE. JOURNAL OF ENGINEERING GEOLOGY, 19(3): 317-322.
    Citation: ZHENG Da, JU Nengpan. 2011: SCANNING ELECTRONIC MICROSCOPE TESTS FOR ROCK MICRO-RUPTURE MECHANISM AND FRACTURE CHARACTERISTIC OF PHYLLITE. JOURNAL OF ENGINEERING GEOLOGY, 19(3): 317-322.

    千枚岩岩石微观破裂机理与断裂特征研究

    SCANNING ELECTRONIC MICROSCOPE TESTS FOR ROCK MICRO-RUPTURE MECHANISM AND FRACTURE CHARACTERISTIC OF PHYLLITE

    • 摘要: 岩石的宏观断裂与其内部微结构和微缺陷紧密相关,建立岩石微观破裂机理和宏观断裂之间更直观的联系是当今断裂力学的难题之一。本文以金沙江上游泥盆系中统中段的绢云母千枚岩与硅质板状千枚岩为研究对象,利用扫描电镜与力学试验等多种测试手段,通过对2种千枚岩岩石断口的微观形貌特征的研究,揭示了千枚岩岩石微观破裂形式、破裂机理与其矿物组成之间的联系。指出绢云母千枚岩岩石以沿晶面擦花的微观破裂形式为主,是典型的微观脆性剪断,而硅质板状千枚岩岩石既有沿晶断裂的拉断破裂,又存在切晶擦花的剪切微破裂形式,是属于拉、剪破裂并存的微观破裂机制。进一步结合岩石断裂的力学特征,分析千枚岩微观破裂与宏观断裂之间的联系。结果显示:千枚岩岩石在外力作用下的断裂形式与其微观破裂形式是可对应的。这一结论为建立起岩石微观破坏机制和宏观断裂特征的桥梁提供了依据,具有一定的理论意义。

       

      Abstract: Macroscopic fractures of rocks are strongly linked to their microstructures and micro-defects.It is one of difficult problems of rock fracture mechanics to establish more intuitive relationship between rock microscopic mechanism and macro rupture.This paper uses the sericite phyllite and siliceous plate phyllite of Middle Devonian series on upriver of Jinsha River as the research object.The micro-rupture properties of rock are judged and the relation between the form and mechanism of phyllite micro-rupture and mineral component is revealed through scanning electronic microscope and mechanical tests.The sericite phyllite shows micro-scratch micro-fracture fracture which is a typical micro-brittle shear.The forms of micro-fracture have both pull-off rupture caused by intergranular fracture and the micro-shear rupture,belonging to the micro-fracture mechanism of the coexistence of the tension and shear fracture.The physical meaning of rock fracture is analyzed with the combination of mechanic characteristics of macroscopic fracture.The evidence is acquired to establish the link between rock micro-rupture mechanism and macroscopic fracture analysis.

       

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