Explicit dynamics based numerical simulation approach for assessment of impact of relief hole on blast induced deformation pattern in an underground face blast

Abstract The breakage of rock mass by blasting has many challenges. The optimal breakage in an underground development face/tunnel blast is dominantly dependent on the relief area provided to the blast holes. The cut portion in the burn cut face blast is significantly important to achieve the controlled deformation due to the blast. This paper has discussed the impact of the number and diameter of the relief holes on the breakage pattern of the rock. The numerical simulation with varying numbers and diameter of relief hole was carried out for this purpose. Finite element modeller explicit dynamics of Ansys-Autodyn was used for the simulation work. The isosurface of non-deformed zone was plotted to compare the extent of deformation under varying conditions of relief holes. The analysis shows that the higher number of relief holes with optimum diameter gives more controlled deformation than single relief hole with larger diameter. The nearfield vibration was also recorded by placement of seismograph. The waveform analysis of the recorded vibration was carried out. The redesigning of the blasting pattern was done using the results of numerical simulation and waveform analysis. The redesigned pattern consists of four relief holes of 115 mm diameter. The blasting output with the revised design has resulted into the considerable improvements in the pull and reduction of overbreak. The revised pattern has addressed the issue of the socket formation at the site.

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Explicit dynamics based numerical simulation approach for assessment of impact of relief hole on blast induced deformation pattern in an underground face blast

Geomechanics and Geophysics for Geo-Energy and Geo-Resources ◽

10.1007/s40948-021-00327-5 ◽

2021 ◽

Vol 8 (1) ◽

Author(s):

Vivek K. Himanshu ◽

A. K. Mishra ◽

Ashish K. Vishwakarma ◽

M. P. Roy ◽

P. K. Singh

Keyword(s):

Numerical Simulation ◽

Deformation Pattern ◽

Simulation Approach ◽

Explicit Dynamics

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Modelling on Shock-Induced Energy Release Behavior of Reactive Materials considering Mechanical-Thermal-Chemical Coupled Effect

Shock and Vibration ◽

10.1155/2021/6669573 ◽

2021 ◽

Vol 2021 ◽

pp. 1-12

Author(s):

Baoyue Guo ◽

Kerong Ren ◽

Zhibin Li ◽

Rong Chen

Keyword(s):

Numerical Simulation ◽

Energy Release ◽

Simulation Approach ◽

Release Behavior ◽

Reactive Material ◽

Reactive Materials ◽

Coupled Effect ◽

Macro Scale ◽

The Military ◽

The Impact

Reactive material (RM) is a new type of energetic material, which is widely used in the military technology fields such as fragmentation warheads and shaped charge warheads. Violent chemical reactions take place in the impact process of reactive materials, and how to realize the macro numerical simulation of shock-induced energy release behavior of reactive materials is one of the most urgent problems to be solved for its future military applications. In this study, a numerical simulation approach and procedure is proposed, which can simulate the shock-induced energy release behavior of reactive materials on a macro scale. Firstly, program implementation of the mechanical-thermal-chemical coupled effect model for RM is realized in the second-development interface of LS-DYNA software. Then, the adaptive simulated annealing algorithm is used to fit the chemical reaction kinetic parameters of RM using the direct ballistics test data. Finally, the simulation calculation of the fragment penetrating upon steel plate is carried out to expand the applicability of the numerical simulation approach proposed in this study. The results show that the numerical simulation approach proposed in this study can reproduce the results of the direct ballistics test more accurately, which assumes practical significance for the engineering application of reactive materials in the military field in the future.

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Analysis of Take-Off Performances for a Double-Joint Hopping Leg

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.211-212.16 ◽

2011 ◽

Vol 211-212 ◽

pp. 16-20

Author(s):

Sheng Hai Hu ◽

Kun Xiu Deng ◽

Wei Fu ◽

Lin Li

Keyword(s):

Numerical Simulation ◽

Energy Efficiency ◽

Trajectory Planning ◽

Center Of Mass ◽

Kinematics And Dynamics ◽

Simulation Approach ◽

Hopping Robot ◽

Relative Coordinates ◽

Joint Trajectory Planning ◽

The Impact

The paper is focused on a double-joint hopping leg driven by motors. Using relative coordinates, its kinematics and dynamics between the system and components are established during the launching stage of jumping, and the take-off mechanism is analyzed. Based on mechanics of jump movement and joint trajectory planning method, the impact of the change of the system initial posture and joint trajectories upon the system take-off performances, such as energy efficiency, instantaneous velocity of the system center of mass (CoM), is discussed by using numerical simulation approach with drive constraints. For a hopping robot, good take-off performances can improve its motion ability, so the resulted conclusions here provides a useful and helpful reference for analyzing and designing a multi-joint hopping robot.

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An investigation on the impact of temperature variation over the performance of tin-based perovskite solar cell: A numerical simulation approach

Materials Today Proceedings ◽

10.1016/j.matpr.2020.09.281 ◽

2020 ◽

Author(s):

Priyanka Roy ◽

Numeshwar Kumar Sinha ◽

Ayush Khare

Keyword(s):

Numerical Simulation ◽

Solar Cell ◽

Temperature Variation ◽

Perovskite Solar Cell ◽

Simulation Approach ◽

The Impact

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Stochastic simulation for determining the design flood of cascade reservoir systems

Hydrology Research ◽

10.2166/nh.2011.002 ◽

2012 ◽

Vol 43 (1-2) ◽

pp. 54-63 ◽

Cited By ~ 6

Author(s):

Baohong Lu ◽

Huanghe Gu ◽

Ziyin Xie ◽

Jiufu Liu ◽

Lejun Ma ◽

...

Keyword(s):

Simulation Model ◽

Stochastic Simulation ◽

Southern China ◽

Flow Simulation ◽

Simulation Method ◽

Simulation Approach ◽

Design Flood ◽

Design Values ◽

Stochastic Simulation Model ◽

The Impact

Stochastic simulation is widely applied for estimating the design flood of various hydrosystems. The design flood at a reservoir site should consider the impact of upstream reservoirs, along with any development of hydropower. This paper investigates and applies a stochastic simulation approach for determining the design flood of a complex cascade of reservoirs in the Longtan watershed, southern China. The magnitude of the design flood when the impact of the upstream reservoirs is considered is less than that without considering them. In particular, the stochastic simulation model takes into account both systematic and historical flood records. As the reliability of the frequency analysis increases with more representative samples, it is desirable to incorporate historical flood records, if available, into the stochastic simulation model. This study shows that the design values from the stochastic simulation method with historical flood records are higher than those without historical flood records. The paper demonstrates the advantages of adopting a stochastic flow simulation approach to address design-flood-related issues for a complex cascade reservoir system.

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