JOURNALS/BOOKS
Experimental study on effects of stress path on uniaxial creep properties of marble 95-104 W. Chen

Energy Education Science and Tevhnology Part C: Future Energy Sources

2014 Volum (issues) 6(3&4): 95-104

 

  

Experimental study on effects of stress

path on uniaxial creep properties of marble

 

Wenling Chen1,2,3,*

 

1First Author and Corresponding Author1. College of Geology Engineering and GeomaticsChang¢an UniversityXi¢anShaanxi 710054,China

2Key Laboratory of Western China′s Mineral Resource and Geological Engineering of Ministry of EducationChang¢an UniversityXi¢anShaanxi 710054;

3Open Research Laboratory of Geotechnical Engineering of Ministry of Land ResourceXi¢anShaanxi 710054;

 

 

 

 

Received: 29 January 2014; accepted: 25 April 2014

Abstract

 

 

  Adopting step loading method, design different stress path by changing stress level and loading time of each stress level,then carry out uniaxial creep test of marble under different stress path. Comparing and analyzing the obtained isochronous stress-strain curve,accelerated creep curve and failure mode to study the effects of stress path on uniaxial creep properties of marble. The main conclusions gained are the following: (1) The isochronous stress-strain curve has two turning point named linear proportion limit and yield stress. Regard linear proportion limit and yield stress as boundary, when the stress levels change between different range, loading time has different degree of influence on the creep curve, therefore, step loading will have different degree of influence on the creep parameters. (2) There is a step on every accelerated creep curve. But for different stress path, the appearing time and steepness of every step is different, therefore, the shape of every accelerated creep curve is different. (3)There have two kinds of macroscopic crack on the surface of damaged rock sample named vertical crack and inclined crack. But for different stress path, the controlled macroscopic crack for failure is different, so the necessary loading time and failure mode are different for different rock sample. (4) Stress path has little influence on linear proportion limit, yield stress, viscoelastic total axial creep strain, viscoplastic total axial creep strain and the stress level for failure.

 

 

Keywords:stress path;marble;isochronous stress-strain curve;accelerated creep curve;failure mode