岩盐蠕变行为的宏细观损伤特性试验研究

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摘要岩盐的长期力学行为是地下储气库建设安全评估的重要参数，其蠕变特性和所受荷载条件(应力、温度、湿度)与其内部结构紧密相关。利用数字图像相关技术研究金坛岩盐不同尺度下蠕变过程及损伤演化。数字图像测试技术不仅给出材料在100 µm和厘米尺度全场应变分布，而且跟踪裂纹的发展变化。重点介绍不同应力水平下材料的蠕变行为，试验结果验证了蠕变速率随应力水平的提高而增加，测量到该岩盐在11 MPa的单轴条件下的宏观尺度稳定蠕变速率为10－9 s－1左右，而细观蠕变速率与其对应的结构紧密相关。蠕变过程中，裂纹扩展引起的损伤被准确定位，主要在晶粒与晶粒之间，且主要属于张拉破坏。

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关键词 ：岩石力学, 岩盐, 地下储气库, 蠕变行为, 数字图像相关技术, 多尺度测量

Abstract：The creep behaviour is an important parameter to estimate the feasibility and safety of underground gas storage in rock salt caverns. The paper mainly presents an experimental study about the creep behaviour of Jintan rock salt by means of the digital image correlation(DIC) techniques，which not only can give a full-field strain，but also can follow the evolution of the microstructure of the material. The two symmetrical surfaces of the cubic samples have been investigated during the creep test by two digital cameras. The results show that the strain rate in stable creep is about 10－9 s－1 at the axial stress of 11 MPa. The dependence of the strain rate upon the stress，time-dependent damage and the relation between this dependence and the microstructure are discussed.

Key words： rock mechanics rock salt underground gas storage creep behaviour digital image correlation technique multiscale measurement

收稿日期: 2011-03-30

引用本文:

杨典森1，陈卫忠2，3，杨建平3，李术才2. 岩盐蠕变行为的宏细观损伤特性试验研究[J]. 岩石力学与工程学报, 2011, 30(7): 1363-1367.
YANG Diansen1，CHEN Weizhong2，3，YANG Jianping3，LI Shucai2. EXPERIMENTAL STUDY OF MICRO-MACRO DAMAGE PROPERTIES OF ROCK SALT DURING CREEP TEST BY MEANS OF DIGITAL IMAGE CORRELATION TECHNIQUE. , 2011, 30(7): 1363-1367.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/I7/1363

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