An experiment on temperature variations in sandstone during biaxial loading

被引：25

作者：

Chen, Shunyun ^{[1
]}

Liu, Peixun ^{[1
]}

Guo, Yanshuang ^{[1
]}

Liu, Liqiang ^{[1
]}

Ma, Jin ^{[1
]}

机构：

[1] China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing 100029, Peoples R China

来源：

PHYSICS AND CHEMISTRY OF THE EARTH | 2015年 / 85-86卷

基金：

中国国家自然科学基金;

关键词：

Temperature response; Stress-strain; Volume deformation; Pure shear; Sandstone; SEISMICALLY ACTIVE AREAS; PRE-EARTHQUAKE SIGNALS; SATELLITE; ALGORITHM;

D O I：

10.1016/j.pce.2014.10.006

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The temperature response to stress-strain variations in rock is useful in developing an understanding of the thermodynamic property of crust. In this study, the temperature of sandstone during loading was investigated using laboratory biaxial testing. By changing the loading patterns, the deformation of a specimen was controlled to produce two distinct modes of strain: volume strain only and shear strain only. These strain modes were produced separately such that the temperature variation associated with the different deformation modes could be analysed. Experimental results indicate that temperature, as a scalar quantity, is notably sensitive to rock deformation. In the case of the volume strain, the temperature variation is positively correlated with the variation in the bulk stress. The temperature rises with the increase in hydrostatic pressure, and vice versa. In the case of the shear strain, experimental results repeatedly show two characteristics: firstly, there appears obvious increase in temperature in the area of pure shear strain, which is most likely related to local plastic deformation; secondly, the temperature drops in the area of tension during loading, whereas the temperature rises within the area of compression. This is to say, the state of crustal stress-strain should be obtained through the measurement of rock temperature. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：3 / 8

页数：6

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