地震地质 ›› 2017, Vol. 39 ›› Issue (1): 54-66.DOI: 10.3969/j.issn.0253-4967.2017.01.004

• 研究论文 • 上一篇    下一篇

水对Carrara大理岩强度和变形机制影响的实验研究

张豫宏, 周永胜, 姚文明, 何昌荣, 党嘉祥   

  1. 中国地震局地质研究所, 地震动力学国家重点实验室, 北京 100029
  • 收稿日期:2016-01-13 修回日期:2016-03-30 出版日期:2017-02-20 发布日期:2017-04-26
  • 通讯作者: 周永胜,男,研究员,E-mail:zhouysh@ies.ac.cn
  • 作者简介:张豫宏,男,1989年生,2014年于中国地震局地质研究所获构造地质学硕士学位,研究方向为高温高压岩石流变学,电话:010-62009076,E-mail:whove@live.cn
  • 基金资助:

    中国地震局地震行业科研专项(201508018)与地震动力学国家重点实验室自主课题(LED2009A01)共同资助

EXPERIMENTAL STUDY ON THE EFFECT OF WATER ON THE STRENGTH AND DEFORMATION MECHANISM OF CARRARA MARBLE AT HIGH TEMPERATURE

ZHANG Yu-hong, ZHOU Yong-sheng, YAO Wen-ming, HE Chang-rong, DANG Jia-xiang   

  1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
  • Received:2016-01-13 Revised:2016-03-30 Online:2017-02-20 Published:2017-04-26

摘要:

采用干燥和含水Carrara大理岩样品,在温度400~700℃、围压300MPa、应变速率10-4/s和10-5/s条件下开展了轴向压缩实验。利用傅里叶变换红外光谱仪,测试了实验样品中的水含量,通过偏光显微镜、扫描电镜与能谱分析了实验变形样品的微观结构。实验力学数据表明,在400℃时,样品表现为应变强化特征;在500~700℃条件下,样品转变为稳态流变。样品强度随温度增加而降低,随应变速率降低而降低;而水对大理岩强度的影响不显著。微观结构分析表明,在400℃时,大理岩以脆性破裂为主,含水样品局部出现压溶。在500℃时干样品和含水大理岩处于脆塑性转化变形域。干样品在600℃时变形以位错滑移为主,而干样品在700℃时和含水样品在600~700℃时,以位错攀移和动态重结晶为主要变形机制。较低的应变速率和较高的水含量促进了压溶作用和动态重结晶。

关键词: 水, 强度, 变形机制, 大理岩, 压溶, 动态重结晶

Abstract:

We performed deformation experiments using Carrara marble in dry and wet conditions under temperature of 400~700℃ and confining pressure 300MPa with two different strain rates. Water contents of deformed samples were measured using FTIR spectroscopy. The microstructure and deformation mechanisms of samples were observed under optical microscopy, scanning electron microscopy and energy spectroscopy analysis. The mechanical data show that samples display strain hardening at 400℃, and transition to steady creep at temperature from 500~700℃. The strength of marble reduced gradually with elevated temperatures or decreased strain rate. However, water effect to the strength of the marble is significantly weak. Microstructures observed show that the deformation is cataclastic flow in dry samples, fracture and pressure solution in wet samples at 400℃. Samples underwent brittle-plastic transition at 500℃. Dislocation glide is major deformation mechanism for dry samples at 600℃. Dislocation climb and dynamic recrystallization are major deformation mechanism for wet samples at 600℃ and for all wet samples and dry samples at 700℃. Lower strain rate and higher water content could promote the process of pressure solution and diffusion as well as dynamic recrystallization.

Key words: water, strength, deformation mechanism, Carrara marble, pressure solution, dynamic recrystallization

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