首页 » 文章 » 文章详细信息
Advances in Civil Engineering Volume 2018 ,2018-03-20
Effects of Cyclic Loading on the Mechanical Properties of Mature Bedding Shale
Research Article
Yintong Guo 1 Chunhe Yang 1 Lei Wang 1 Feng Xu 1
Show affiliations
DOI:10.1155/2018/8985973
Received 2017-11-03, accepted for publication 2018-01-28, Published 2018-01-28
PDF
摘要

We investigated the mechanical properties of mature bedding shale under cyclic loading conditions, with an application to the design of hydraulic fracturing in shale gas wells. Laboratory experiments were conducted on shale samples under two principal loading orientations. Testing results showed that accumulated fatigue damage occurs in a three-stage process. Analysis of fatigue damage at different maximum stress levels shows that fatigue life increases as a power-law function with maximum stress decreasing. And the maximum stress significantly affects the fatigue life. Further, the elastic part of shale rock deformation was recovered in the unloading process, whereas the irreversible deformation remained. The irreversible deformation, growth trend, and accumulation of the total fatigue were directly related to the fatigue damage. This process can be divided into 3 stages: an initial damage stage, a constant velocity damage stage, and an accelerated damage stage, which accounted for about one-third of the fatigue damage. Shale rock is a nonhomogeneous material, and the bedding is well developed. Its fatigue life differs greatly in two principal loading orientations, even under the same loading conditions. All of these drawn conclusions are of great importance for design of hydraulic fracturing in shale gas wells.

授权许可

Copyright © 2018 Yintong Guo et al. 2018
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

图表

Typical shale samples before testing.

Apparatus and schematic.

Stress-strain curves of shale under uniaxial compression test (vertical coring).

Stress-strain curves of shale under uniaxial compression test (parallel coring).

Stress-strain curves for uniaxial compression (sample H-12) and cyclic (sample H-2) loading tests.

Stress-strain curves for uniaxial compression (sample V-13) and cyclic (sample V-3) loading tests.

The relationship between maximum cyclic loading ratio and fatigue damage cycle number (frequency 0.5 Hz).

The relationship between axial strain and relative cycle. (a) Parallel coring; (b) vertical coring.

The relationship between axial strain and relative cycle. (a) Parallel coring; (b) vertical coring.

The relationship between irreversible deformation and the number of cycles. (a) Parallel coring; (b) vertical coring.

The relationship between irreversible deformation and the number of cycles. (a) Parallel coring; (b) vertical coring.

Damage variable versus cyclic numbers. (a) Parallel coring; (b) vertical coring.

Damage variable versus cyclic numbers. (a) Parallel coring; (b) vertical coring.

The relationship between fatigue deformation modulus and relative cycle times. (a) Parallel coring; (b) vertical coring.

The relationship between fatigue deformation modulus and relative cycle times. (a) Parallel coring; (b) vertical coring.

Typical failure modes after fatigue test. (a) Parallel coring; (b) vertical coring.

Typical failure modes after fatigue test. (a) Parallel coring; (b) vertical coring.

通讯作者

Yintong Guo.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China, cas.cn.ytguo@whrsm.ac.cn

推荐引用方式

Yintong Guo,Chunhe Yang,Lei Wang,Feng Xu. Effects of Cyclic Loading on the Mechanical Properties of Mature Bedding Shale. Advances in Civil Engineering ,Vol.2018(2018)

您觉得这篇文章对您有帮助吗?
分享和收藏
0

是否收藏?

参考文献
[1] A. Momeni, M. Karakus, G. R. Khanlari, M. Heidari. et al.(2015). Effects of cyclic loading on the mechanical properties of a granite. International Journal of Rock Mechanics and Mining Sciences.77:89-96. DOI: 10.1016/j.jngse.2016.03.046.
[2] M. N. Bagde, V. Petros. (2009). Fatigue and dynamic energy behaviour of rock subjected to cyclical loading. International Journal of Rock Mechanics and Mining Sciences.46(1):200-209. DOI: 10.1016/j.jngse.2016.03.046.
[3] W. G. Liang, C. D. Zhang, H. B. Gao. (2012). Experiments on mechanical properties of salt rocks under cyclic loading. International Journal of Rock Mechanics and Mining Sciences.4(1):54-61. DOI: 10.1016/j.jngse.2016.03.046.
[4] F. Kittitep, P. Decho. (2010). Effects of cyclic loading on mechanical properties of Maha Sarakham salt. Engineering Geology.112(1–4):43-52. DOI: 10.1016/j.jngse.2016.03.046.
[5] J. Q. Xiao, D. X. Ding, G. Xu, F. Jiang. et al.(2008). Waveform effect on quasi-dynamic loading condition and the mechanical properties of brittle materials. International Journal of Rock Mechanics and Mining Sciences.45(4):621-626. DOI: 10.1016/j.jngse.2016.03.046.
[6] C. L. Feng, X. Q. Wu, D. X. Ding. (2009). Investigation on fatigue characteristics of white sandstone under cyclic loading. Chinese Journal of Rock Mechanics and Engineering.28(1):2749-2754. DOI: 10.1016/j.jngse.2016.03.046.
[7] J. Y. Fan, J. Chen, D. Y. Jiang. (2016). Fatigue properties of rock salt subjected to interval cyclic pressure. International Journal of Fatigue.90:109-115. DOI: 10.1016/j.jngse.2016.03.046.
[8] Q. X. Zang, X. R. Ge, M. Huang. (2006). Testing study on fatigue deformation law of red-sandstone under triaxial compression with cyclic loading. Chinese Journal of Rock Mechanics and Engineering.25(3):473-478. DOI: 10.1016/j.jngse.2016.03.046.
[9] M. N. Bagde, V. Petros. (2005). Waveform effect on fatigue properties of intact sandstone in uniaxial cyclical loading. Rock Mechanics and Rock Engineering.38(3):169-196. DOI: 10.1016/j.jngse.2016.03.046.
[10] J. Wang, L. Z. Xie, H. P. Xie. (2016). Effect of layer orientation on acoustic emission characteristics of anisotropic shale in Brazilian tests. Journal of Natural Gas Science and Engineering.36:1-10. DOI: 10.1016/j.jngse.2016.03.046.
[11] J. Q. Xiao, D. X. Ding, G. Xu, F. L. Jiang. et al.(2009). Inverted S-shaped model for nonlinear fatigue damage of rock. International Journal of Rock Mechanics and Mining Sciences.46(3):643-648. DOI: 10.1016/j.jngse.2016.03.046.
[12] ISRM. (2007). The complete ISRM suggested methods for rock characterization, testing and monitoring: 1974–2006. Suggested Methods Prepared by the Commission on Testing Methods. DOI: 10.1016/j.jngse.2016.03.046.
[13] Y. J. Yang, Y. Song, J. Chu. (2007). Experimental study on characteristics of strength and deformation of coal under cyclic loading. Chinese Journal of Rock Mechanics and Engineering.26(1):201-205. DOI: 10.1016/j.jngse.2016.03.046.
[14] E. Liu, S. He. (2012). Effects of cyclic dynamic loading on the mechanical properties of intact rock samples under confining pressure conditions. Engineering Geology.125:81-91. DOI: 10.1016/j.jngse.2016.03.046.
[15] X. R. GE, Y. F. Lu. (1992). Discussion about coal’s fatigue failure and irreversible problem under cyclic loads. Chinese Journal of Engineering.14(3):56-60. DOI: 10.1016/j.jngse.2016.03.046.
[16] Y. T. Guo, C. H. Yang, H. J. Mao. (2012). Mechanical properties of Jintan mine rock salt under complex stress paths. International Journal of Rock Mechanics and Mining Sciences.56:54-61. DOI: 10.1016/j.jngse.2016.03.046.
[17] J. Q. Xiao, D. X. Ding, F. L. Jiang. (2010). Fatigue damage variable and evolution of rock subjected to cyclic loading. International Journal of Rock Mechanics and Mining Sciences.47(3):461-468. DOI: 10.1016/j.jngse.2016.03.046.
文献评价指标
浏览 132次
下载全文 12次
评分次数 0次
用户评分 0.0分
分享 0次