Secondary development and application of the NP-T creep model based on FLAC3D

2017 ◽  
Vol 10 (23) ◽  
Author(s):  
Luwang Chen ◽  
Shengjie Li ◽  
Kaixian Zhang ◽  
Yanxian Liu
Keyword(s):  
Creep Model ◽  
Secondary Development ◽  
Model Based

scholarly journals Nonlinear Viscoelastic–Plastic Creep Model Based on Coal Multistage Creep Tests and Experimental Validation

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3468 ◽  
Author(s):  
Junxiang Zhang ◽  
Bo Li ◽  
Conghui Zhang ◽  
Peng Li
Keyword(s):  
Creep Behavior ◽  
Physical Property ◽  
Creep Model ◽  
Creep Process ◽  
Creep Tests ◽  
Model Based ◽  
Nonlinear Viscoelastic ◽  
Improved Model ◽  
And Control ◽  
Plastic Creep

The development of fractures, which determine the complexity of coal creep characteristics, is the main physical property of coal relative to other rocks. This study conducted a series of multistage creep tests to investigate the creep behavior of coal under different stress levels. A negative elastic modulus and a non-Newtonian component were introduced into the classical Nishihara model based on the theoretical analysis of the experimental results to propose a nonlinear viscoelastic–plastic creep model for describing the non-decay creep behavior of coal. The validity of the model was verified by experimental data. The results show that this improved model can preferably exhibit decelerating, steady state, and accelerating creep behavior during the non-decay creep process. The fitting accuracy of the improved model was significantly higher than that of the classical Nishihara model. Given that acceleration creep is a critical stage in predicting the instability and failure of coal, its successful description using this improved model is crucial for the prevention and control of coal dynamic disasters.

scholarly journals New Maxwell Creep Model Based on Fractional and Elastic-Plastic Elements

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Hao Tang ◽  
Dongpo Wang ◽  
Zhao Duan
Keyword(s):  
Rock Salt ◽  
Damage Mechanics ◽  
Rheological Behaviour ◽  
Creep Model ◽  
Creep Data ◽  
Creep Equation ◽  
New Model ◽  
Elastic Plastic ◽  
Simulation Performance ◽  
Model Based

Creep models are mainly used to describe the rheological behaviour of geotechnical materials. An important research focus for studying creep in geotechnical materials is the development of a model with few parameters and good simulation performance. Hence, in this study, by replacing the Newtonian dashpot and spring in the classical Maxwell model with fractional and elastic-plastic elements, a new Maxwell creep model based on fractional derivatives and continuum damage mechanics was developed. One- and three-dimensional (1D/3D) creep equations of the new Maxwell creep model were derived. The 1D creep equation of the new model was used to fit existing creep data of rock salt, and the 3D creep equation was used to fit the creep data of remolded loess. The model curves matched the creep data very well, showing considerably higher accuracy than other models. Furthermore, a sensitivity study was carried out, showing the effects of the fractional derivative order β and exponent α on the creep strain of rock salt. This new model is simple with few parameters and can effectively simulate the complete creep behaviour of geotechnical materials.

Study on Improved Nonlinear Viscoelastic-Plastic Creep Model Based on the Nishihara Model

2020 ◽  
Vol 38 (3) ◽  
pp. 3203-3214
Author(s):  
Mingyuan Yu ◽  
Baoguo Liu ◽  
Jinglai Sun ◽  
Wenlin Feng ◽  
Qi Wang
Keyword(s):  
Creep Model ◽  
Model Based ◽  
Nonlinear Viscoelastic ◽  
Plastic Creep

A nonlinear creep model based on the concept of slip

2011 ◽  
Vol 46 (6) ◽  
pp. 922-928
Author(s):  
A. M. Simonyan
Keyword(s):  
Creep Model ◽  
Nonlinear Creep ◽  
Model Based

scholarly journals Research on Construction Optimization of Three-Connected-Arch Hydraulic Underground Cavities Considering Creep Property

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Bao-yun Zhao ◽  
Nian-chun Xu ◽  
Zi-yun Li ◽  
Tong-qing Wu
Keyword(s):  
Large Scale ◽  
Creep Property ◽  
Construction Method ◽  
Surrounding Rock ◽  
Creep Model ◽  
Secondary Development ◽  
Underground Cavity ◽  
Construction Methods ◽  
Nonlinear Viscoelastic ◽  
Construction Optimization

In order to prevent the creep of surrounding rock in long-term construction, with consideration of different construction methods and other factors during the construction of large-scale underground cavity, three different construction schemes are designed for specific projects and a nonlinear viscoelastic-plastic creep model which can describe rock accelerated creeping is introduced and applied to construction optimization calculation of the large-scale three-connected-arch hydraulic underground cavity through secondary development of FLAC3D. The results show that the adoption of middle cavity construction method, the second construction method, enables the maximum vault displacement of 16.04 mm. This method results in less stress redistribution and plastic zone expansion to the cavity’s surrounding rock than the other two schemes, which is the safest construction scheme. The conclusion can provide essential reference and guidance to similar engineering for construction optimization.

A Fiber Model Based on Secondary Development of ABAQUS for Elastic–Plastic Analysis

2018 ◽  
Vol 18 (5) ◽  
pp. 1560-1576 ◽  
Author(s):  
Yan-Li Shi ◽  
Hua-Wei Li ◽  
Wen-Da Wang ◽  
Chao Hou
Keyword(s):  
Secondary Development ◽  
Fiber Model ◽  
Elastic Plastic ◽  
Model Based ◽  
Plastic Analysis

Study on Cost Decision Model Based on BIM and AHP

2014 ◽  
Vol 584-586 ◽  
pp. 2205-2208 ◽  
Author(s):  
Jian Wen Cao ◽  
Hao Kai Zheng
Keyword(s):  
Decision Model ◽  
Cost Management ◽  
Secondary Development ◽  
Analytic Hierarchy ◽  
Model Based ◽  
Development Technology ◽  
The Cost ◽  
Cost Plan ◽  
Decision Making Model ◽  
Hierarchy Process

An optimal cost decision is the premise of cost plan and the important way to realize the goal of cost and increase economic efficiency. At the same time, the correctness of the cost decision depends on accurate cost information.This paper builds the cost decision-making model based on the BIM with Revit API secondary development technology and the analytic hierarchy process (AHP), so as to provide methods for the cost decision of construction project and promote the application of BIM in cost management.

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