Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock-Like Materials
Creep property is an important mechanical property of rocks. Given the complexity of rock masses, mechanical parameters change with time in the creep process. In this work, a nonlinear function for describing the time-dependent change of parameters was introduced and an improved variable-parameter n...
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doaj-cc68eaa674d34252b2dd462652a26f462020-11-24T21:41:56ZengHindawi LimitedAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/73021417302141Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock-Like MaterialsHang Lin0Xing Zhang1Yixian Wang2Rui Yong3Xiang Fan4Shigui Du5Yanlin Zhao6School of Resources and Safety Engineering, Central South University, Changsha, Hunan 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha, Hunan 410083, ChinaSchool of Civil Engineering, Hefei University of Technology, Hefei 230009, ChinaOcean College, Zhejiang University, Zhoushan, Zhejiang 316000, ChinaSchool of Highway, Chang’an University, Xi’an, Shannxi 710064, ChinaOcean College, Zhejiang University, Zhoushan, Zhejiang 316000, ChinaSchool of Energy and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, ChinaCreep property is an important mechanical property of rocks. Given the complexity of rock masses, mechanical parameters change with time in the creep process. In this work, a nonlinear function for describing the time-dependent change of parameters was introduced and an improved variable-parameter nonlinear Nishihara shear creep model of rocks was established. By creating rock-like materials, the mechanical properties of rocks under the shear creep test condition were studied, and the deformation characteristics and long-term shear strength of rocks during creep were analyzed. The material parameters of the model were identified using the creep test results. Comparison of the model’s calculated values and experimental data indicated that the model can describe the creep characteristics of rocks well, thus proving the correctness and rationality of the improved model. During shear creep, the mechanical properties of rocks have an aging effect and show hardening characteristics under low shear stress. Furthermore, according to the fact that Gk of the nonlinear model can characterize the creep deformation resistance, a method to determine the long-term shear strength is proposed.http://dx.doi.org/10.1155/2020/7302141 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hang Lin Xing Zhang Yixian Wang Rui Yong Xiang Fan Shigui Du Yanlin Zhao |
spellingShingle |
Hang Lin Xing Zhang Yixian Wang Rui Yong Xiang Fan Shigui Du Yanlin Zhao Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock-Like Materials Advances in Civil Engineering |
author_facet |
Hang Lin Xing Zhang Yixian Wang Rui Yong Xiang Fan Shigui Du Yanlin Zhao |
author_sort |
Hang Lin |
title |
Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock-Like Materials |
title_short |
Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock-Like Materials |
title_full |
Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock-Like Materials |
title_fullStr |
Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock-Like Materials |
title_full_unstemmed |
Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock-Like Materials |
title_sort |
improved nonlinear nishihara shear creep model with variable parameters for rock-like materials |
publisher |
Hindawi Limited |
series |
Advances in Civil Engineering |
issn |
1687-8086 1687-8094 |
publishDate |
2020-01-01 |
description |
Creep property is an important mechanical property of rocks. Given the complexity of rock masses, mechanical parameters change with time in the creep process. In this work, a nonlinear function for describing the time-dependent change of parameters was introduced and an improved variable-parameter nonlinear Nishihara shear creep model of rocks was established. By creating rock-like materials, the mechanical properties of rocks under the shear creep test condition were studied, and the deformation characteristics and long-term shear strength of rocks during creep were analyzed. The material parameters of the model were identified using the creep test results. Comparison of the model’s calculated values and experimental data indicated that the model can describe the creep characteristics of rocks well, thus proving the correctness and rationality of the improved model. During shear creep, the mechanical properties of rocks have an aging effect and show hardening characteristics under low shear stress. Furthermore, according to the fact that Gk of the nonlinear model can characterize the creep deformation resistance, a method to determine the long-term shear strength is proposed. |
url |
http://dx.doi.org/10.1155/2020/7302141 |
work_keys_str_mv |
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1716664911000502272 |