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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Main Authors: Hang Lin, Xing Zhang, Yixian Wang, Rui Yong, Xiang Fan, Shigui Du, Yanlin Zhao
Format: Article
Language:English
Published: Hindawi Limited 2020-01-01
Series:Advances in Civil Engineering
Online Access:http://dx.doi.org/10.1155/2020/7302141
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spelling 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
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AT ruiyong improvednonlinearnishiharashearcreepmodelwithvariableparametersforrocklikematerials
AT xiangfan improvednonlinearnishiharashearcreepmodelwithvariableparametersforrocklikematerials
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