scholarly journals Numerical simulation analysis of anchorage characteristics of constant-resistance and large-deformation anchor cable for highly weathered rock masses

2020 ◽  
Author(s):  
Tao Zhigang ◽  
Deng Fei ◽  
WANG Zhicai ◽  
QIAO Xiaobing ◽  
LI Mengnan ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Axial Force ◽  
Simulation Analysis ◽  
Shear Strain Rate ◽  
Reinforcement Effect ◽  
Anchorage Length ◽  
Reinforcement System ◽  
Anchor Cable ◽  
Geological Conditions ◽  
Calculation Results

Abstract In order to effectively maintain the stability of high and steep loose slopes around the site of the Tonglushan Ancient Copper Mine in Daye City, Hubei Province, the NPR anchor cable reinforcement system was introduced. Based on the significance of anchorage characteristics of NPR anchor cable for the whole reinforcement system, we first investigated and analyzed the engineering geological conditions of the ancient smelting site slopes, while selected a typical highly weathered section to establish a numerical simulation calculation model. Following, utilized the FLAC3D method to numerically calculate the reinforcement effect of NPR anchor cables under various anchorage lengths. Finally, based on the calculation results, we reveal the changes in displacement, as well as in stress and anchor cable axial force of the site slope, analyzing the shear strain rate and evolution characteristics of plastic zone near the potential sliding surface. The calculation results show that as the NPR anchorage length increase, the displacement gradually decrease. Moreover, the maximum axial force of the NPR anchor cable and the principal stress of the slope change slightly, while the plastic failure range gradually decrease; when the anchorage length is 20m, the safety factor reach the peak value and the reinforcement effect is optimal, which lay the theoretical and practical foundation for the reinforcement control of similar site slopes.

Mechanical Property Analysis and Numerical Simulation of Honeycomb Sandwich Structure’s Core

2013 ◽  
Vol 631-632 ◽  
pp. 518-523 ◽  
Author(s):  
Xiang Li ◽  
Min You
Keyword(s):  
Numerical Simulation ◽  
Elastic Constants ◽  
Sandwich Structure ◽  
Optimization Design ◽  
Simulation Analysis ◽  
Finite Element Program ◽  
Honeycomb Sandwich ◽  
Calculation Results ◽  
Element Program ◽  
Typical Satellite

Owing to the lack of a good theory method to obtain the accurate equivalent elastic constants of hexagon honeycomb sandwich structure’s core, the paper analyzed mechanics performance of honeycomb sandwich structure’s core and deduced equivalent elastic constants of hexagon honeycomb sandwich structure’s core considering the wall plate expansion deformation’s effect of hexagonal cell. And also a typical satellite sandwich structure was chose as an application to analyze. The commercial finite element program ANSYS was employed to evaluate the mechanics property of hexagon honeycomb core. Numerical simulation analysis and theoretical calculation results show the formulas of equivalent elastic constants is correct and also research results of the paper provide theory basis for satellite cellular sandwich structure optimization design.

scholarly journals Numerical Simulation Analysis of NPR Anchorage Monitoring of Bedding Rock Landslide in Open-Pit Mine

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Kai Zhang ◽  
Xiaojie Yang ◽  
Xuebin Cui ◽  
Yong Wang ◽  
Zhigang Tao
Keyword(s):  
Numerical Simulation ◽  
Early Warning ◽  
Simulation Analysis ◽  
Failure Process ◽  
Open Pit Mine ◽  
Open Pit ◽  
Stress Monitoring ◽  
Anchor Cable ◽  
Whole Process ◽  
Rock Landslide

Nanfen open-pit iron mine is the largest single open-pit mine in Asia. Because of the lag of the extension project, the section has slowly spread in the shape of “V,” and disasters such as landslides occur frequently. In this study, first, the NPR anchor cable monitoring, which shows supernormal mechanical characteristics and can realize the monitoring and early warning target for the whole landslide process and early warning curve of bedding rock “2016-1101 landslide” in the lower wall of Nanfen open-pit mine, was analyzed, revealing the failure process of the bedding rock landslide and the force evolution characteristics of the NPR anchor cable. Then, based on the Fish language in FLAC3D and 3DEC software, the mechanical model of the NPR anchor cable was constructed, and numerical simulation was performed on the whole process of “16-1101 landslide” induced by accumulation of old landslide body. The results of this study indicate that the stress monitoring curves and failure characteristics of the NPR anchor cables in the whole process of landslide by the two numerical simulation methods are basically consistent with the field measurement results, providing a theoretical and practical basis for the mechanistic analysis and numerical simulation of other similar slopes.

Numerical Research on the Floor Heave Control of Deep Roadway in Coal Mining

2012 ◽  
Vol 524-527 ◽  
pp. 446-449 ◽  
Author(s):  
Fu Kun Xiao ◽  
Chun Jie Zhang ◽  
Li Wei Gao ◽  
Yang Yang Yue
Keyword(s):  
Numerical Simulation ◽  
Simulation Method ◽  
Good Effect ◽  
Optimal Program ◽  
Anchor Cable ◽  
Geological Conditions ◽  
Floor Heave ◽  
Mine Roadway ◽  
Numerical Research ◽  
Main Factors

On the engineering background of coal mine roadway orbit, according to the destruction of its original roadway, the paper have analyzed the situation of the deformation in the roadway , using the method of numerical simulation. Besides, it also determined the stress distribution and the forces supporting of roadway in the deformation process. Geological conditions, support patterns and bad construction are considered as the main factors of roadway damage and new support method is given. Numerical simulation method is used to study mechanism about anchor rod, anchor cable and anchor mesh coupled with the surrounding, bottom corner anchor rod and grouting to determine the optimal program. The new program is applied to the practice field and monitored, indicating that the application has a very good effect.

Numerical Simulation Analysis of Different Coal Mine Roadway Support Effect

2013 ◽  
Vol 807-809 ◽  
pp. 2356-2360 ◽  
Author(s):  
Guang Yi Sun ◽  
Xiao Luo
Keyword(s):  
Numerical Simulation ◽  
Coal Mine ◽  
Simulation Analysis ◽  
Support Effect ◽  
Surrounding Rock ◽  
Anchor Cable ◽  
Mine Roadway ◽  
Coal Wall ◽  
Roadway Support

The application of FLAC2D software long ditch coal mine extraction tunnel without support boltgrouting. Anchor when the anchor rope supporting and strengthening supporting state ofroadwaywere simulated and analyzed the change of roadway surrounding rock under differentsupport forms. Demonstrated the possibility that the current anchor cable anchor supporting andanalysis under the condition of the coal wall broken grouting bolt is the necessity of reinforcement.

Aerodynamic Characteristics Simulation Analysis of a Certain Type Changed Wing Drone Aircraft Based on CFD

2014 ◽  
Vol 644-650 ◽  
pp. 746-750
Author(s):  
De You Ma ◽  
Ming Xu ◽  
Zhao Tao Chen
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Aerodynamic Characteristics ◽  
Aerodynamic Performance ◽  
Type Model ◽  
Flight Performance ◽  
Flight Data ◽  
Simulation Calculation ◽  
Calculation Results ◽  
Conventional Type

This paper aims at the change of the whole machine aerodynamic characteristics after a certain conventional type drone aircraft changing plateau type large wings , using CFD technology to establish the nomal type and plateau type model, doing numerical simulation calculation of the whole machine's aerodynamic performance under the condition of no-load, using the simulation calculation results and combined with actual flight data, compared and evaluated the aerodynamic characteristics of the drone aircraft installed different airfoil, the results show that change plateau type large wings, obviously improve the lift-to-drag performance of the whole machine, increase the range of effective attack angle, and the little change of flight performance, scientific and feasible.

The Application of FLAC Software in Stability Analysis of Highway Slope Reinforced by Prestressed Anchor Cable

2012 ◽  
Vol 241-244 ◽  
pp. 2158-2162
Author(s):  
Hui Min Wang ◽  
Liang Cao ◽  
Ji Yao ◽  
Ze Li
Keyword(s):  
Numerical Simulation ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Stability Factor ◽  
Anchor Cable ◽  
Equilibrium Method ◽  
Before And After ◽  
Calculation Results ◽  
The Stability ◽  
Prestressed Anchor

rigid limit equilibrium method and numerical simulation of FLAC software based on strength reduction method was used in this paper, and the stability of a highway slope before and after the reinforcement by prestressed anchor cable was analyzed. The calculation results showed that, the stability of designed excavated slope could not meet the requirements, while the stability of reinforced sloped by prestressed anchor cable could. The sliding surface of the slope and the corresponding stability factor could be obtained in two ways, but the numerical simulation of FLAC software considered the material deformation, so the calculation results was smaller than the results of rigid limit equilibrium method.

Numerical Simulation Analysis on Deformation Mechanism of Shallow-Buried Soft Rock Roadway

2013 ◽  
Vol 734-737 ◽  
pp. 773-776
Author(s):  
Zhi Chao Tian ◽  
Long Hao Dong ◽  
Ye Jiao Liu
Keyword(s):  
Numerical Simulation ◽  
Deformation Mechanism ◽  
Simulation Analysis ◽  
Soft Rock ◽  
Pressure Control ◽  
Calculation Model ◽  
Underground Mines ◽  
Rock Support ◽  
Geological Conditions ◽  
Rock Tunnel

The pressure control of soft-rock and roadway support has been one of the challenges of underground mines. Soft-rock support is very difficult in many places in China and is becoming a kind of main influencing factors in the development and economic of mining community. Numerical simulation research on the deformation mechanism of soft-rock tunnel contributes to the development of soft-rock support theory. The numerical calculation model of shallow buried soft-rock is based on Hongya coalmine; ANSYS is used to analysis the deformation law inward to find out how to control the soft-rock deformation. Hence we can know the main influence in the shallow soft-rock tunnel stability. The results are of great importance to the mines that have similar geological conditions.

Numerical Simulation Analysis of the Optimized and Transformed 200MW Pulverized Coal Fired Boiler Burner

2014 ◽  
Vol 672-674 ◽  
pp. 1524-1527
Author(s):  
Tai Lv ◽  
Shi Ze Zhao
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Combustion Process ◽  
Concentration Field ◽  
Industrial Test ◽  
Computational Fluid Mechanics ◽  
Before And After ◽  
Calculation Results ◽  
Combustion Technology ◽  
Low Nitrogen

With the use of computational fluid mechanics software – FLUENT, the numerical simulation computation of combustion process inside a certain 200MW corner tangential firing boiler whose combustor is transformed by the multi-grade efficient low-nitrogen combustion technology was conducted, thus the furnace temperature, velocity, mixture and NOx concentration field at rated conditions before and after the transformation were obtained. The calculation results were highly identical with the industrial test results. The results show that after using the multi-grade efficient low-nitrogen combustion technology, the NOx emissions significantly lowered down with the drop of about 40% compared with the emissions before transformation, while the furnace coking and high temperature corrosion were effectively controlled, achieving good economic and social benefits and providing a reference to the design and transformation of the same types of boilers.

PFC2D Numerical Simulation Study of Interfaces Characteristics for Prestressed Anchor Cable under Cyclic Loading

2014 ◽  
Vol 629-630 ◽  
pp. 579-583
Author(s):  
Jian Xiang Feng ◽  
Si Feng Zhang ◽  
Jin Sheng Du
Keyword(s):  
Numerical Simulation ◽  
Stress Concentration ◽  
Cyclic Loading ◽  
Rotation Angle ◽  
Simulation Analysis ◽  
Progressive Failure ◽  
Tensile Force ◽  
Anchor Cable ◽  
Tension And Compression ◽  
Prestressed Anchor

Abstract: Affected by various external factors, the tensile force of prestressed anchorage structures presents loop and fluctuation characteristics in practical engineerings, which will cause severe impact on the inner anchoring section of the prestressed anchorage structures. On this base, PFC2D discrete element program was established for numerical simulation analysis of microscopic physical and mechanical changing characteristics of stress, porosity, angle, etc. of different interfaces locations for prestressed anchor cable under cyclic loading. The results showed that: at locations of the front-middle, the grouting body near interfaces were divided into tensile stress area of the inside part and compressive stress area of the outside part, and two locations of y-direction stress concentration were located at the two end of inner anchoring section; The interfaces had the feature of progressive failure and the characteristic of shear stress peak shifting; While loading finish, particles at different locations of interfaces basically generated clockwise rotation angle, but at two locations of y-direction stress concentration, the particles rotation angle, which was very small at the other locations, was very large; At y-direction tension and compression stress boundary, the particles spinning direction showed instability characteristic and the ultimate rotation angle was small.

The Lightweight Design and Simulation of Hydraulic Steel Gate with Metal Sandwich Construction

2015 ◽  
Vol 1095 ◽  
pp. 539-544
Author(s):  
Xiang Li ◽  
Guan Tong ◽  
You Hui Zhou
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Lightweight Design ◽  
Three Dimensional ◽  
Mechanical Equipment ◽  
Metal Structures ◽  
Three Dimensional Modeling ◽  
Sandwich Construction ◽  
Calculation Results ◽  
Steel Gate

The paper applies composite technology into the field of hydraulic metal structures and hydropower construction mechanical equipment design, and presents the method of optimum design of hydraulic steel gate metal sandwich construction and simulation analysis. According to characteristics of the structure of the flat hydraulic steel gate and selecting the appropriate metal sandwich construction, this paper optimize the design of a hydraulic steel gate of metal sandwich construction from the perspective of light-weight purpose of structure. Considering the overall mechanical behavior of steel gate structures and using technology of three-dimensional modeling and numerical simulation, this paper has a numerical simulation analysis on the optimum hydraulic steel gate. Numerical simulation analysis and theoretical calculation results show the optimum structure of hydraulic steel gate is reasonably practicable.

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