基于微观试验的云母石英片岩三轴蠕变机制研究

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摘要首先，采用偏光显微镜镜下目测和能谱分析对云母石英片岩的矿物成分进行鉴定，将云母石英片岩主要组成划分为空隙、裂隙等缺陷，坚硬部分和软弱部分，总共3部分；坚硬部分为受力骨架，其他两部分充填于受力骨架中；白云母为软弱部分，石英为坚硬部分。然后，通过电子显微镜、偏光显微镜对云母石英片岩三轴蠕变的3个阶段，既未受力阶段、即将出现加速蠕变阶段和破坏阶段的径向切片、轴向切片进行观测，以了解在云母石英片岩三轴蠕变过程中3部分所产生的微观结构变化；根据观测结果将云母石英片岩微结构变化分为4种，即张开裂隙的闭合、软弱部分的位置调整、坚硬部分的位置调整和微破裂；同时总结出云母石英片岩中白云母和石英的微破裂形式。随后，经过分析云母石英片岩三轴蠕变过程的微观结构变化原因，对三轴蠕变机制进行解释，发现在不同的外加应力水平下，以及同一应力水平经过不同的加载时间，云母石英片岩内会产生4种微结构变化中的几种，因此分别表现出衰减蠕变阶段、等速蠕变阶段和加速蠕变阶段。最后，基于微观试验总结提出云母石英片岩三轴蠕变机制的3个特点。

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关键词 ：岩石力学, 云母石英片岩, 微结构变化, 三轴蠕变机制

Abstract：Firstly，the mineral composition of mica-quartz schist samples is determined through visual measurement by polarizing microscope and energy spectrum analysis. The mineral composition of mica-quartz schist is divided into three parts such as hard part，soft part，and defects such as voids and cracks. For these three parts，the hard part is the force skeleton，the other two parts fill in it. Quartz is the hard part，white mica is the soft part in the mica-quartz schist sample. Secondly，in order to study the microstructure changes of mica-quartz schist during triaxial creep process，the polarizing microscope tests and electronic microscope scanning tests are conducted to observe the radial slices and axial slices of mica-quartz schist for three triaxial creep stages，which are no force stage，the upcoming accelerated creep stage and damage stage. According to the test results，the microstructure changes of mica-quartz schist are divided into four kinds，which are closure of open crack，position adjustment of hard part，position adjustment of soft part and micro-damage. At the same time，the micro-damage style of white mica and quartz are summarized separately. Thirdly，through analyzing the reasons for microstructure changes of mica-quartz schist，the creep mechanism is interpreted. It is observed that in different stress levels，and through different loading time of the same stress level，several microstructure changes of above-mentioned four changes of mica-quartz schist will generate，therefore there show attenuation creep stage，constant creep stage and accelerated creep stage，respectively. Lastly，three characteristics of this triaxial creep mechanism for mica-quartz schist based on microscope test are summarized.

Key words： rock mechanics mica-quartz schist microstructure changes triaxial creep mechanism

收稿日期: 2009-07-02

引用本文:

陈文玲1，2，3，赵法锁1，2，3，弓虎军4. 基于微观试验的云母石英片岩三轴蠕变机制研究[J]. 岩石力学与工程学报, 2010, 29(S2): 3578-3584.
CHEN Wenling1，2，3，ZHAO Fasuo1，2，3，GONG Hujun4. STUDY OF TRIAXIAL CREEP MECHANISM OF MICA-QUARTZ SCHIST BASED ON MICROSCOPIC TEST. , 2010, 29(S2): 3578-3584.

链接本文:

http://www.rockmech.org/CN/Y2010/V29/IS2/3578

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