Modeling large displacement of rock block and a work face excavation of a coal mine based on discontinuous deformation analysis and finite deformation theory

2019 ◽  
Vol 92 ◽  
pp. 103048 ◽  
Author(s):  
Yanan Gao ◽  
Feng Gao ◽  
Manchu Ronald Yeung
Keyword(s):  
Coal Mine ◽  
Finite Deformation ◽  
Deformation Theory ◽  
Large Displacement ◽  
Rock Block ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Discontinuous Deformation ◽  
Finite Deformation Theory

Research on mechanical properties of a polymer membrane with a void based on the finite deformation theory

e-Polymers ◽  
2015 ◽  
Vol 15 (5) ◽  
pp. 293-299
Author(s):  
Jianbing Sang ◽  
Sufang Xing ◽  
Hongyan Tian ◽  
Jingyuan Wang ◽  
Jing Zhou
Keyword(s):  
Mechanical Properties ◽  
Finite Deformation ◽  
Deformation Theory ◽  
Polymer Membrane ◽  
Constitutive Parameter ◽  
Deformation Analysis ◽  
Membrane Structures ◽  
Finite Deformation Theory ◽  
Constitutive Parameters ◽  
Failure Localization

AbstractPolymer membrane structures with voids can be fractured due to larger deformation and stress concentration with the effect of an externally applied load, which can lead to failure localization and crack propagation. With the modified constitutive model from Gao, finite deformation analysis of a polymer membrane containing a void has been researched. By deducing the basic governing equation for solving the problem, the paper figures out the stress distribution of different constitutive parameters and discusses the effects on membrane deformation by different parameters and the reasons for the failure of the membrane. The results show that the constitutive parameter n has a major impact on the mechanical properties of a polymer membrane with a void, which provides a reference for the design of polymer membranes.

scholarly journals Numerical modeling of complex hydraulic fracture networks based on the discontinuous deformation analysis (DDA) method

2021 ◽  
pp. 014459872098153
Author(s):  
Yanzhi Hu ◽  
Xiao Li ◽  
Zhaobin Zhang ◽  
Jianming He ◽  
Guanfang Li
Keyword(s):  
Hydraulic Fracturing ◽  
Hydraulic Fracture ◽  
Fracture Network ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Fracture Networks ◽  
Proposed Model ◽  
Discontinuous Deformation ◽  
Shale Reservoirs ◽  
Dda Method

Hydraulic fracturing is one of the most important technologies for shale gas production. Complex hydraulic fracture networks can be stimulated in shale reservoirs due to the existence of numerous natural fractures. The prediction of the complex fracture network remains a difficult and challenging problem. This paper presents a fully coupled hydromechanical model for complex hydraulic fracture network propagation based on the discontinuous deformation analysis (DDA) method. In the proposed model, the fracture propagation and rock mass deformation are simulated under the framework of DDA, and the fluid flow within fractures is simulated using lubrication theory. In particular, the natural fracture network is considered by using the discrete fracture network (DFN) model. The proposed model is widely verified against several analytical and experimental results. All the numerical results show good agreement. Then, this model is applied to field-scale modeling of hydraulic fracturing in naturally fractured shale reservoirs. The simulation results show that the proposed model can capture the evolution process of complex hydraulic fracture networks. This work offers a feasible numerical tool for investigating hydraulic fracturing processes, which may be useful for optimizing the fracturing design of shale gas reservoirs.

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