Discontinuous Deformation Analysis for the Wave-Induced Settlement of a Seawall

2009 ◽  
Author(s):  
D.S. Jeng ◽  
Y. Oh ◽  
S. Chen
Keyword(s):  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Discontinuous Deformation ◽  
Wave Induced

Simulation of Whole Movement Process of Muzhuping Landslide with DDA and Prediction of Surge

2014 ◽  
Vol 989-994 ◽  
pp. 2254-2257
Author(s):  
Zhi Hong Dong ◽  
Xiu Li Ding ◽  
Ai Qing Wu ◽  
Bo Lu
Keyword(s):  
Difficult Problem ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Movement Process ◽  
River Reservoir ◽  
Discontinuous Deformation ◽  
Wave Induced ◽  
Surge Height ◽  
Landslide Movement ◽  
Dda Method

The surge wave induced by the landslide on reservoir bank is extremely disaster .The prediction of surge height is a difficult problem because the velocity of landslide is hard to obtain. The discontinuous deformation analysis (DDA) is able to simulate landslide movement with real time and acceleration. The whole movement process of Muzhuping landslide in the Qing river reservoir is simulated by DDA method, including startup, accelerating, deceleration and stop, and velocity along time is obtained. Last, empirical formula for computing surge height is discussed.

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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