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Open AccessArticle

Loading History Effect on Creep Deformation of Rock

1
College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China
2
Deep Earth Energy Research Laboratory, Department of Civil Engineering, Monash University, 3800 Melbourne, VIC, Australia
3
Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China
*
Author to whom correspondence should be addressed.
Energies 2018, 11(6), 1462; https://doi.org/10.3390/en11061462
Received: 6 May 2018 / Revised: 22 May 2018 / Accepted: 31 May 2018 / Published: 6 June 2018
The creep characteristics of rocks are very important for assessing the long-term stability of rock engineering structures. Two loading methods are commonly used in creep tests: single-step loading and multi-step loading. The multi-step loading method avoids the discrete influence of rock specimens on creep deformation and is relatively time-efficient. It has been widely accepted by researchers in the area of creep testing. However, in the process of multi-step loading, later deformation is affected by earlier loading. This is a key problem in considering the effects of loading history. Therefore, we intend to analyze the deformation laws of rock under multi-step loading and propose a method to correct the disturbance of the preceding load. Based on multi-step loading creep tests, the memory effect of creep deformation caused by loading history is discussed in this paper. A time-affected correction method for the creep strains under multi-step loading is proposed. From this correction method, the creep deformation under single-step loading can be estimated by the super-position of creeps obtained by the dissolution of a multistep creep. We compare the time-affected correction method to the coordinate translation method without considering loading history. The results show that the former results are more consistent with the experimental results. The coordinate translation method produces a large error which should be avoided. View Full-Text
Keywords: loading history effect; creep deformation; rock; multi-stage loading; creep test loading history effect; creep deformation; rock; multi-stage loading; creep test
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MDPI and ACS Style

Yang, W.; Gamage, R.P.; Huang, C.; Luo, G.; Guo, J.; Wang, S. Loading History Effect on Creep Deformation of Rock. Energies 2018, 11, 1462.

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