Prediction and numerical simulation of the face‐slab extrusion damage of Dashixia concrete faced rock‐fill dam

2020 ◽  
Author(s):  
Sheng Zhu ◽  
Zhiyuan Ning ◽  
Jing Wang
Keyword(s):  
Numerical Simulation ◽  
Rock Fill ◽  
The Face

Examining the seismic stress evolution in the face slab of concrete-faced rock-fill dams using dynamic centrifuge tests

2019 ◽  
Vol 123 ◽  
pp. 337-356 ◽  
Author(s):  
Xuedong Zhang ◽  
Zitao Zhang ◽  
Yingqi Wei ◽  
Jianhui Liang ◽  
Jing Hu
Keyword(s):  
Stress Evolution ◽  
Rock Fill ◽  
Centrifuge Tests ◽  
The Face ◽  
Seismic Stress

Risk Analysis and Assessment for the Face Stability of Tunnel

2011 ◽  
Vol 261-263 ◽  
pp. 380-384
Author(s):  
Hai Tao Wang ◽  
Jin Qing Jia
Keyword(s):  
Numerical Simulation ◽  
Monte Carlo Simulation ◽  
Probability Of Failure ◽  
Stability Factor ◽  
Critical Element ◽  
Face Stability ◽  
Starting Point ◽  
The Face ◽  
Design Value ◽  
Acceptable Probability

The evaluation of the correct stability factor of tunnel is a critical element in the various design and construction phases of a tunnel excavated in difficult geotechnical conditions. An innovative, and well-applied, procedure for optimize the construction phase management is described in this article. The starting point of this procedure involves the verification of the results of numerical methods obtained from referenced analytical methods. In the first step of the procedure the results obtained through the analytical method are verified by means of a numerical method in order to evaluate the practical consequences in terms of development of deformations and plastic zone. In this manner, the assumed design risk is evaluated for the different methods and the solution that gives the best correspondence with numerical simulation is selected. Finally, residual uncertainties and parametric variations are incorporated in the analysis and Monte Carlo simulation is used to calculate the statistical distribution of the face-stabilizing pressure and the design value is selected on the basis of an acceptable probability of failure.

Modeling of low-cement extruded curb of concrete-faced rockfill dam

2011 ◽  
Vol 48 (1) ◽  
pp. 89-97 ◽  
Author(s):  
Ga Zhang ◽  
Jian-Min Zhang
Keyword(s):  
Numerical Simulation ◽  
Damage Model ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Direct Simulation ◽  
Construction Technique ◽  
Displacement Analysis ◽  
Rockfill Dam ◽  
The Face ◽  
Cushion Layer

As the key structure of a practical construction technique, the low-cement extruded curb has been widely used in recent concrete-faced rockfill dams (CFRDs). The extruded curb exhibits significant interactions with the neighboring gravels and with the face slab. These interactions were investigated using element tests, and a new model was proposed. This model is composed of three parts: (i) the equivalent slab that is described using an ideal elastoplasticity model, (ii) the equivalent interface between the curb and the gravel cushion layer that is described using an elastoplasticity damage model, and (iii) the interface between the curb and the face slab that is described using a modified ideal elastoplasticity model. This model was verified via a two-dimensional numerical simulation of an ideal CFRD to capture the main behavior of the extruded curb with interactions between the extruded curb and the neighboring soil – face slab, employing a significantly smaller number of elements and a shorter calculation than direct simulation. The model was used to perform a three-dimensional stress–displacement analysis of the Bakun CFRD (205 m in height), and the results showed that the extruded curb causes a change in the stress of the face slab.

The Wear and Drag Prediction of the 2D Micro-Asperities on Textured Wall

2011 ◽  
Vol 284-286 ◽  
pp. 1489-1492
Author(s):  
Moussa Magara Traore ◽  
Li Wang
Keyword(s):  
Numerical Simulation ◽  
Shear Stress ◽  
Flow Characteristics ◽  
Flow Simulation ◽  
Flow Speed ◽  
Wear Area ◽  
Face Length ◽  
The Face ◽  
Drag Prediction ◽  
Flow Pressure

This study presents a numerical simulation, using the flow simulation of solidworks 2010; the results showed the flow speed trajectory, the variation of the shear stress and the flow pressure on different faces of the micro-asperities in relation with the face length. The simulation was done in steady state and with the no- slips condition in contact with the upper surface. The flow characteristics were found also with different flow speed. The turbulence area due to the micro-asperity geometry is localized. The flow characteristics (variation of shear stress and flow pressure) are analyzed for the prediction of the maximum wear area due to the skin friction or drag.

Numerical Simulation of Roadway Deformation of Different Cutting Aperture

2013 ◽  
Vol 340 ◽  
pp. 892-895
Author(s):  
Xue Min Gong ◽  
Jia Yong Zhang ◽  
Li Wen Guo
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Wall Rock ◽  
Rock Stress ◽  
Analysis Software ◽  
Pressure Relief ◽  
Element Analysis ◽  
Gas Seepage ◽  
The Face ◽  
Roadway Deformation

Using ANSYS finite element analysis software, the crushing effect and wall rock deformation of a small high-pressure jet impacting coal were given numerical simulation analysis. It verified that impacting increased exposed area of coal in punch, providing conditions for pressure relief of internal coal seam and gas seepage. through comprehensive analysis of the rock stress and coal displacement of different roadway models after undercutting, it was determined that aperture size was 4/15 or so of roadway floor length, thus roadway fissures developed full, and maintained rock integrity, in favor of speeding up the face driving.

The Thermal-Fluent-Solid Coupling Numerical Simulation Study of Coal and Rock Containing Gas

2014 ◽  
Vol 1010-1012 ◽  
pp. 1498-1501
Author(s):  
Tao Qin ◽  
Yong Li Liu ◽  
Kai Yun Zhang
Keyword(s):  
Numerical Simulation ◽  
Temperature Change ◽  
Simulation Study ◽  
Viscosity Coefficient ◽  
Gas Pressure ◽  
Seepage Velocity ◽  
Gas Concentration ◽  
Working Face ◽  
Gas Seepage ◽  
The Face

COMSOL software was used in the paper for numerical simulation of excavation face and study stress, gas pressure, the gas seepage velocity, displacement and the change of temperature as well as to the effect of dynamic disaster under different temperature conditions. The results show that the speed of gas pressure to reduce slowed, the gas pressure near the working face gradient increasing with the increase of temperature; the face gas concentration changed not significantly because of the change of temperature under the condition of the temperature change is not big; seepage velocity varies was not obvious under the condition of other conditions don't change, because the viscosity coefficient of the change was not obvious.

Optimization and Application of High Production and High Efficiency Mining Parameters of Fully Mechanized Caving Face

2011 ◽  
Vol 361-363 ◽  
pp. 198-203
Author(s):  
Zhong Ping Guo ◽  
Shan Chao Hu ◽  
Zhi Gao Zhang
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
High Efficiency ◽  
Physical Simulation ◽  
Coal Recovery ◽  
The Face ◽  
High Production ◽  
Cutting Height

The size of the fully mechanized caving face is optimized by theoretical analysis and the dip length of the face is determined as 260m. With the method of numerical simulation, the reasonable cutting height of the face is determined as 3.5m and the caving method is determined as one round caving in order. The physical simulation is used to analyze the caving effects under different drawing intervals and the reasonable drawing interval is determined as 0.8m. The coal recovery is improved by 3.43% after the parameters are applied in field and the goal of high production and high efficiency of the mine has been achieved.

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