Boundary setting method for the seismic dynamic response analysis of engineering rock mass structures using the discontinuous deformation analysis method

2015 ◽  
Vol 39 (15) ◽  
pp. 1693-1712 ◽  
Author(s):  
Xiaodong Fu ◽  
Qian Sheng ◽  
Yonghui Zhang ◽  
Yongqiang Zhou ◽  
Feng Dai
Keyword(s):  
Rock Mass ◽  
Dynamic Response ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Response Analysis ◽  
Analysis Method ◽  
Dynamic Response Analysis ◽  
Boundary Setting ◽  
Discontinuous Deformation

scholarly journals Study on strength parameters of rock mass with stochastic combination discontinuities and their application in a tunnel in China

2018 ◽  
Vol 10 (7) ◽  
pp. 168781401878208
Author(s):  
Jihong Wei ◽  
Jin Liu ◽  
Zezhuo Song ◽  
Yulong Zhu ◽  
Yuxia Bai
Keyword(s):  
Rock Mass ◽  
Numerical Test ◽  
Surrounding Rock ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Test Case ◽  
Analysis Method ◽  
Circular Tunnel ◽  
Rock Stability ◽  
Discontinuous Deformation

The rock mass has special properties, such as inhomogeneity, anisotropy, discontinuity, and nonelastic, due to various internal or external stress in the process of its formation. In this study, similar materials are considered to simulate the rock mass and analyze the failure law using laboratory tri-axial tests based on the similarity principle. The rock mass and discontinuity are constituted in the process of model construction by considering the influence of the orientation, spacing, and number of discontinuity, respectively. Then, the influences of the orientation, spacing, number of discontinuity, and the combination of different discontinuous strength on rupture mechanism of the rock mass are analyzed by considering lots of numerical test schemes using the discontinuous deformation analysis method. Finally, considering water conveyance tunnel in Jurong Pumped Storage Power Station in China as a test case, the tunnel stability under different discontinuities combination is analyzed using discontinuous deformation analysis method. The influence of the optimal tunnel axis and tunnel shape on the stability of surrounding rock is studied by comparative analysis of surrounding rock stability under different tunnel axis and tunnel shapes. The stress concentration in case of the circular tunnel with corner is somehow less than that of the rectangular one.

TUNNEL BLASTING SIMULATIONS BY THE DISCONTINUOUS DEFORMATION ANALYSIS

2011 ◽  
Vol 08 (02) ◽  
pp. 277-292 ◽  
Author(s):  
ZHIYE ZHAO ◽  
YUN ZHANG ◽  
HUIRONG BAO
Keyword(s):  
Rock Mass ◽  
Dynamic Response ◽  
Influence Factors ◽  
Blast Loading ◽  
Rock Fragmentation ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Tunnel Blasting ◽  
Discontinuous Deformation ◽  
Drill And Blast

Drill and blast method has been widely used as an effective excavation method for underground rock caverns or tunnels. To achieve a good blast design, an understanding on the rock dynamic response and rock fragmentation process is important. In this paper, numerical simulations are performed on a typical parallel hole cut blasting based on the discontinuous deformation analysis (DDA). The blast loading is obtained from the explicit FEM code LS-DYNA and the dynamic response of the rock mass is modeled by the DDA. Different influence factors on rock fragmentation under the blast loading are investigated, including the different delay time and various rock mass properties. Such a study will have potential applications for better drill and blast designs.

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