大理岩压溶蠕变与微裂隙愈合实验研究
发布时间:2018-06-28 08:19
本文选题:压溶 + 微裂隙愈合 ; 参考:《中国石油大学学报(自然科学版)》2017年05期
【摘要】:压溶蠕变可能是间震期断层带的主导变形机制之一,开展压溶蠕变及其对微裂隙愈合的实验研究对理解强震孕育和发生具有重要意义。以Carrara大理岩为样品,开展相同围压(800 MPa)和应变速率(1×10-7s-1)、不同温度(300、400、500℃)下大理岩压溶蠕变实验。利用扫描电镜研究实验变形样品的微观结构与变形机制,利用傅里叶变换红外吸收光谱测试实验样品的含水量。实验结果表明:在300℃条件下,碎裂和压溶是样品主要变形机制,400℃时样品同时出现碎裂、压溶和局部动态重结晶,500℃时样品主要变形机制为压溶和动态重结晶。压溶主要出现在样品强变形区域,粒度减小与含水量增加促进了压溶发生,而压溶引起孔隙和微裂隙愈合。
[Abstract]:The pressure solution creep may be one of the dominant deformation mechanisms of the fault zone during the interseismic period. The experimental study on the pressure solution creep and its healing of microcracks is of great significance in understanding the preparation and occurrence of strong earthquakes. Using Carrara marble as sample, the compressive solution creep experiments of marble at the same confining pressure (800MPa) and strain rate (1 脳 10-7s-1) at different temperatures (300400500 鈩,
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