Related Experiment Video
Updated: Jan 18, 2026
09:41
Blast Quantification Using Hopkinson Pressure Bars
Published on: July 5, 2016
9.4K
Numerical study on blasting damage of rock with eccentric charge structure.
Kaihua Liang1,2, Hong Zhao3, Yang Li1,2
1Shandong Province Research Institute of Coal Geology Planning and Exploration, Jinan, China.
Plos One
|January 16, 2026
Summary
Eccentric charges improve rock fragmentation by creating asymmetric stress fields and promoting crack propagation. Optimal blasting structures depend on charge number, guiding safer and more efficient mining operations.
Area of Science:
- Mining Engineering
- Rock Mechanics
- Computational Mechanics
Background:
- Blasting operations are crucial in mining for rock fragmentation.
- Optimizing charge structures enhances safety and efficiency.
- Understanding stress distribution and crack propagation is key.
Purpose of the Study:
- To numerically investigate the impact of eccentric versus concentric decoupled charge structures on rock fragmentation.
- To analyze effective stress (ES) distribution and crack propagation patterns.
- To assess damage evolution using the damage area ratio (DAR) metric.
Main Methods:
- Numerical simulations using ANSYS/LS-DYNA.
- Analysis of effective stress (ES) distribution around a single borehole.
- Quantitative assessment of damage evolution via damage area ratio (DAR).
Main Results:
- Eccentric charges create asymmetric stress fields, with higher ES on the coupled side (up to 2.29x).
- Eccentric charges promote vertically symmetrical crack propagation with increased density near the charge.
- Multi-charge layouts (double/triple) significantly improve blasting effectiveness compared to single charges.
Conclusions:
- Optimal charge structures are bottom-eccentric for single/double charges and concentric for triple charges.
- Eccentric charging's influence range is limited, converging to concentric effects beyond.
- Findings offer theoretical guidance for controlled blasting in various mining applications.
Related Concept Videos
01:16Eccentric Loading
909
Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under...
909
01:21Design of Columns under an Eccentric Load
1.1K
Designing columns to withstand eccentric loads is a critical aspect of structural engineering, ensuring structures can support off-center loads without failure. This design process must account for the additional normal stresses introduced by eccentric loading, which can significantly influence a column's stress distribution and overall stability. An eccentric load applied to a column induces normal stresses that can be conceptualized as a combination of stresses due to an equivalent...
1.1K
01:23Abrasion Resistance of Concrete
522
Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
One such test is the revolving disc test, where three plates...
522
01:12General Case of Eccentric Axial Loading
462
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...
462
01:19Impact Loading
664
Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
In cases of elastic deformation,...
664
01:16Dynamic Modulus of Elasticity of Concrete
943
The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by a...
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by a...
943