Verifying discontinuous deformation analysis simulations of the jointed rock mass behavior of shallow twin mountain tunnels

2020 ◽  
Vol 130 ◽  
pp. 104322
Author(s):  
Trong-Nhan Do ◽  
Jian-Hong Wu
Keyword(s):  
Rock Mass ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Mass Behavior ◽  
Mountain Tunnels ◽  
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.

A numerical method for modelling large displacements of jointed rocks. I. Fundamentals

1993 ◽  
Vol 30 (1) ◽  
pp. 96-108 ◽  
Author(s):  
Baolin Wang ◽  
Vinod K. Garga
Keyword(s):  
Rock Mass ◽  
Numerical Method ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Contact Forces ◽  
Deformation Analysis ◽  
Large Displacements ◽  
Equilibrium Equations ◽  
Proposed Model ◽  
Jointed Rocks

A numerical method called the block-spring model for analyzing heavily jointed rocks is presented in this paper. This model permits the assessment of stability of both underground and surface excavation in jointed rock mass and is capable of simulating large displacements. The model simulates the jointed rock mass by an assemblage of rigid blocks interacting through contacts. By relating the contact forces to the relative displacements between the blocks and directly applying the equilibrium equations, the displacements of the blocks and subsequently the contact forces can be determined. An iteration procedure is applied to describe the progressive failure along the joints. The proposed model can identify unstable blocks by considering the rearrangement of the blocks. A computer program has been written in FORTRAN based on the procedures of the proposed model. Some simple examples are presented in the present paper to demonstrate the capability of the proposed model. Advanced features of the model including simulation of rock bolts and groundwater are presented in a companion paper, in which two case histories have been analyzed in detail with the proposed model. Key words : jointed rocks, stress, deformation, analysis, numerical model, excavation, anchors, groundwater.

USE OF DISCONTINUOUS DEFORMATION ANALYSIS TO EVALUATE THE DYNAMIC BEHAVIOR OF SUBMARINE TSUNAMI-GENERATING LANDSLIDES IN THE MARMARA SEA

2011 ◽  
Vol 08 (02) ◽  
pp. 151-170 ◽  
Author(s):  
GUI CHEN MA ◽  
FUMIO KANEKO ◽  
SHINZABURO HORI ◽  
MAKOTO NEMOTO
Keyword(s):  
Energy Loss ◽  
Dynamic Behavior ◽  
Jointed Rock ◽  
Slope Instability ◽  
Discontinuous Deformation Analysis ◽  
Viscous Force ◽  
Deformation Analysis ◽  
Marmara Sea ◽  
Submarine Landslides ◽  
Discontinuous Deformation

This study assessed the relevance of numerical modeling with respect to the mechanical properties of specific rock and investigated the applicability of submarine landslide simulation using discontinuous deformation analysis (DDA). To predict the dynamic behavior of submarine landslides, we developed a way to model a jointed rock mass for the evaluation of rock slope instability and an original DDA approach using an energy loss model that incorporates energy loss caused by collision between blocks and seawater resistance as a viscous force. We applied the developed model to estimate the dynamic behavior of actual submarine landslides. The simulations assessed seawater resistance and energy loss due to collision between blocks, reproducing past events and suggesting the behavior of vulnerable slopes. The results demonstrate that the model can clarify the energy loss caused by slope absorbability and seawater resistance, and that the improved DDA is very useful for submarine land analysis.

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