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| Elementary functions to fit test curves of hard rock’s weaker creep properties |
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Received:September 14, 2010
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| DOI：10.3969/j.issn.1005-7854.2011.01.003 |
| KeyWord:hard rock; creep; elementary function; correlative coefficient |
| Author | Institution |
| LIU Chuan-xiao |
College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai’an , Shandong，China |
| ZHANG Xiu-li |
Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan , China |
| HUANG Dong-chen |
.College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai’an , Shandong，China |
| 贺加栋 |
.College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai’an , Shandong，China |
| ZHANG Jia-wang |
.College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai’an , Shandong，China |
| ZHANG Fu-jun |
Library of Shandong University of Science and Technology, Qingdao , Shandong ，China |
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| Abstract: |
| By short-term creep test for hard rock with 8 classes of loading and unloading, instantaneous parts of test curves are almost beelines. Slope value of steady creep test curves may be a constant. And the minimum loading for hard rock to start creep is higher. Hence, several important stages in all test curves can present basic creep property of hard rock. Creep properties of hard rock are generally weaker. However, nonlinear creep property of hard rock will increase with loading level, and its creep property in radial direction is correspondingly stronger than that in axial direction. Correlative coefficients（ ） of first order exponential negative functions to fit initial decay creep test curves are evenly 0.99162, and correlative coefficient of first order exponential function to fit accelerated creep curve is also up to 0.90000. Higher correlative coefficients state that creep test curves of hard fine sandstone present simple geometrical shape, which can be fitted just with elementary functions and get accurate results. That elementary functions fit test curves of hard rock’s weaker creep property gives an effective and simplified approach for explaining creep properties of general rock masses. |
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