Dynamic compressive behavior of impact-damaged and …
In backfill mining, surrounding rock damaged by impact loading (e.g. blasting) is immersed in backfill water after backfilling, and the instability of the impact-damaged and water-soaked (IDWS) surrounding rock can occur under blasting loads. To study the dynamic mechanical properties and the size effect of rock under such working …
Water | Free Full-Text | The Dynamic Compressive Properties …
To investigate the dynamic compressive properties and the law of energy dissipation of freeze–thaw-damaged sandstone, static and dynamic compressive experiments were conducted. The influences of the number of freeze–thaw cycles and strain rate on strength characteristics, energy dissipation rate and the fractal dimension …
Evaluation of blast fragmentation effects on jaw crusher …
Blast-induced fragmentation has a significant influence on the operational efficiency of open pit mines, especially on loading and crushing, the two immediate tasks after blasting.
Mining Hazards: Implications and Recommendations for …
Its massive and intensified exposure, while cutting, breaking, crushing, grinding and blasting of sandstone, rocks and masonry, is very harmful to the functioning of human lungs.
Effects of grain crushing, ductile grain deformation, and …
Mechanical compaction plays a crucial role during porosity loss of sandstone, and grain crushing is one of the common phenomena in the clastic reservoir in cold, fast-buried, young foreland basins under high stress. The GC model proposed in this study is a new simulated method based on grain crushing and DEM. This appendix is mainly …
(PDF) Pressure Relief by Blasting Roof Cutting in Close Seam …
Close seam group mining under thin immediate roofs and thick sandstone walls is typically performed with a strong mine pressure and gas concentration, which pose considerable risks to miners.
P&Q University Lesson 7: Crushing & Secondary Breaking
With proper choke-feed, cone-speed and reduction-ratio settings, cone crushers will efficiently produce material that is high quality and cubical in nature. In …
Emission of respirable dust from stone quarrying, potential health
The results obtained from the present study indicated that drilling, blasting, crushing, and transport of mined material are chiefly responsible for the generation of dust. Whereas drilling, blasting, ... crushing, and transportation of sandstone. Apart from it, population residing downwind of the mining area is particularly vulnerable to the ...
Numerical simulation of the dynamic impact breakage …
The dynamic fragmentation of solid, brittle materials is a fundamental activity that lies at the start of many manufacturing and recovery processes, most notably during crushing in the minerals and aggregates industries, during blasting in quarries and tunnels and in the action of some rock cutting processes [1].
Shape characteristics and crushed law of deep sandstone …
In order to study the shape characteristics and crushing law of deep sandstone impact crushed blocks under different impact loads. In this paper, Split Hopkinson pressure bar (SHPB) tests were conducted on sandstone specimens under different impact loads.
Compaction behaviour and particle crushing of a crushed sandstone …
The density-moisture curves for five crushed sandstone particle mixtures, with different grain size distribution curves, were determined by a standard compaction test. The values of the maximum dry...
Processes | Free Full-Text | Pressure Relief by Blasting Roof …
Close seam group mining under thin immediate roofs and thick sandstone walls is typically performed with a strong mine pressure and gas concentration, which pose considerable risks to miners. In this study, the mechanism of pressure relief and permeability enhancement to enhance gas extraction for mining safety through blasting roof …
Study on Blasting Characteristics of Soft‐Hard Rock Strata …
In order to explore the influence of soft-hard rock strata on rock blasting characteristics, based on PFC2D software, combined with particle expansion loading algorithm, the numerical simulation blasting experiments are carried out. Firstly, the rationality of blasting method is verified by single-hole sandstone blasting experiment.
11.19.2 Crushed Stone Processing and Pulverized …
Rock and crushed stone products generally are loosened by drilling and blasting and then are loaded by power shovel or front-end loader into large haul trucks that transport the material to the processing operations.
Managing dust risks at quarries | Envirotec
In the following article, Josh Thomas from instrumentation specialist Ashtead Technology, discusses the risks associated with dust at quarries, and highlights the vital role of monitoring.
Cracks propagation characteristics of double-hole delay blasting …
Numerical model of single-hole blasting in sandstone. ... After blasting, the ratio of the crushing zone radius to the blasthole radius usually follows a certain law, ...
Aggregate Resource Industries | Drilling and Blasting …
Aggregate Resource Industries is certified as an Indian Economic Enterprise, qualifying for Buy Indian Act projects for drilling, blasting and portable crushing. Our team of highly skilled professionals have the knowledge and expertise to provide customized solutions to meet the specific needs of our customers.
STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES
Special precautions must be taken at the contact between the rock and the loading platens to avoid crushing that could throw doubts as to the mechanism of failure in the test …
(PDF) Influence of water coupling coefficient on the blasting …
This study investigates the impact of different water coupling coefficients on the blasting effect of red sandstone. The analysis is based on the theories of detonation wave and elastic wave ...
Experimental investigation on the mechanical behavior and …
Rocks extracted from deep mining operations often undergo various complex temperature and dynamic load disturbances. In order to investigate the influence of temperature on the mechanical characteristics and fracture mechanisms of sandstone under different loading conditions, thermal treatments were conducted on sandstone …
Influence of dynamic load and water on energy …
Consequently, this study scrutinizes the strength evolution of dry sandstone, saturated sandstone, and natural sandstone under different dynamic load conditions by conducting dynamic load tests at ...
Effects of Compaction Effort on Compaction Behavior and …
The present study focuses on the effects of compaction effort on the compaction behavior and particle crushing of a mixture of crushed sandstone particles and mudstone particles. Compaction tests under five different compaction efforts on the mixture were performed. Testing results indicate that the values of the maximum dry …
Construction aggregates: evaluation and specification
These are extracted in quarries by drilling, blasting and crushing. Sand and gravel aggregate is typically sourced from unconsolidated sediments of fluvial, lacustrine or marine origin. ... suitability of sandstone for aggregate use depends on its strength, porosity and durability (Figure 1).
Study on Mechanism of Static Blasting-Induced Hard Rock …
In this study, lab-scale crater blasting experiments on sandstone specimens under various equal biaxial compressive stresses were conducted to investigate the effects of in situ stress on blasting effects and …
(PDF) Silicosis, Mining, and Occupational Health in India's Sandstone …
4 Those workers are involved in various activities in mines like; drilling, blasting, crushing the large stone to smaller one and loading-unloading of slab from trucks, that expose them to high ...
Numerical simulation of blasting behavior of rock mass with …
High ground stress can limit the generation of rock cracks caused by blasting, and blasting usually shows different crushing states than low stress conditions. In order to study the blasting ...
Evaluation of blast fragmentation effects on jaw crusher …
Within the scope of this study, blasting and primary crushing operations of a sandstone quarry in Istanbul were studied. Several shots were observed and recorded. The particle size distribution of each shot-rock muckpile after every blast was assessed by means of digital image processing technique.
Production and Uses of Crushed Rock Aggregates: An …
Crushed – rock aggregates are the granular filler material such as sand, stone dust, gravel, crushed stone, crushed blast-furnace slag, etc. that are used with …
Image Processing Analysis of Blast Fragmentation: A Case …
Abstract- The blasting operation plays an important task in the overall economics of opencast mines. The degree of fragmentation affects the loading, transport, crushing operations.
Study on Blasting Characteristics of Soft‐Hard Rock Strata …
In order to explore the influence of the structural plane position on the internal energy of rock mass, this paper analyzes the blasting results from the …
Types of Sandstone Used in Residential Construction
Discover the versatility and charm of sandstone in residential construction. This article unravels the distinct types of sandstone, their unique qualities, and aesthetic influences that bring elegance and stability to your dream home. Immerse yourself in the realm of architectural brilliance with sandstone.
Numerical study of the impact mechanism of decoupling …
Request PDF | Numerical study of the impact mechanism of decoupling charge on blasting-enhanced permeability in low-permeability sandstones | More than seventy percent of sandstone-type uranium ...