Can we mine blocks of stone using blast methods while minimizing damage to the stone?
In order to ensure the process of directional fracturing, it is necessary that the pressure of blast products would be greater than the tensile strength of a rock, and, for the preservation of a peripheral rock mass, the pressure of blast products in a blasthole should not exceed the rock compressive strength. These conditions are achieved by selecting rational blasthole spacing and optimal parameters of a blast pulse.
It was established that for the most probable propagation of radial main rupture between blasthole charges during stone block mining it is necessary to use the effect of stress wave interaction.
It should be noted that in order to minimize the zone of induced fracturing, the charge amount should be selected so that the tensile stress field in the plane of the rupture does not exceed the tensile strength. The main rupture propagation begins with the arrival of a rarefaction wave reflected from the surface of the separated stone block.
You can learn more about this from the article in our journal:
🔥 Kovalevsky V.N., Mysin A.V., Sushkova V.I. Theoretical aspects of block stone blasting method. Mining Science and Technology (Russia). 2024;9(2):97-104. https://doi.org/10.17073/2500-0632-2023-12-187 🔥
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👉t.iss.one/MinSciTech👈
#inenglish #MST #mining #stone #blast #block_massive #blast_pulse
In order to ensure the process of directional fracturing, it is necessary that the pressure of blast products would be greater than the tensile strength of a rock, and, for the preservation of a peripheral rock mass, the pressure of blast products in a blasthole should not exceed the rock compressive strength. These conditions are achieved by selecting rational blasthole spacing and optimal parameters of a blast pulse.
It was established that for the most probable propagation of radial main rupture between blasthole charges during stone block mining it is necessary to use the effect of stress wave interaction.
It should be noted that in order to minimize the zone of induced fracturing, the charge amount should be selected so that the tensile stress field in the plane of the rupture does not exceed the tensile strength. The main rupture propagation begins with the arrival of a rarefaction wave reflected from the surface of the separated stone block.
You can learn more about this from the article in our journal:
🔥 Kovalevsky V.N., Mysin A.V., Sushkova V.I. Theoretical aspects of block stone blasting method. Mining Science and Technology (Russia). 2024;9(2):97-104. https://doi.org/10.17073/2500-0632-2023-12-187 🔥
Subscribe to the journal's Telegram channel:
👉t.iss.one/MinSciTech👈
#inenglish #MST #mining #stone #blast #block_massive #blast_pulse
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How to reduce the output of fines rate during block stone extraction by drilling and blasting?
At many quarries for the extraction of building stone there is a problem of increased output of fines after all stages of crushing and grinding, which leads to a decrease in the economic performance of mining enterprises. The fine fraction is formed by the crushing / grinding of prefractured rock mass. Reducing the intensity and size of the prefracture zones will lead to a solution to the problem at hand. It was established that the greatest influence on the shape and duration of the blast pulse is exerted by the velocity of explosive detonation. As the detonation velocity decreases, the peak pressure of the head part of the pulse decreases, and the duration of its rise increases, while a low-amplitude pulse of long duration contributes to better crushing of a rock mass with the least effect of prefracture. Using explosives with a reduced detonation velocity allows reducing the “surplus” impact on a rock mass and thus reducing the intensity of prefracture in the zone of controlled crushing during a blast. This is because the individual pieces will be weakened to a lesser extent after a blast and as a result, the yield of undersize when crushing rock into crushed stone will be reduced.
For more information, see the article:
📌 Khokhlov S.V., Vinogradov Yu.I., Makkoev V.A., Abiyev Z.A. Effect of explosive detonation velocity on the degree of rock pre-fracturing during blasting. Mining Science and Technology (Russia). 2024;9(2):85-96. https://doi.org/10.17073/2500-0632-2023-11-177
Subscribe to the journal's Telegram channel:
👉t.iss.one/MinSciTech👈
#inenglish #MST #prefracture #crushing #blast #stress #microfracture #fracture #density #detonation #velocity #fines
At many quarries for the extraction of building stone there is a problem of increased output of fines after all stages of crushing and grinding, which leads to a decrease in the economic performance of mining enterprises. The fine fraction is formed by the crushing / grinding of prefractured rock mass. Reducing the intensity and size of the prefracture zones will lead to a solution to the problem at hand. It was established that the greatest influence on the shape and duration of the blast pulse is exerted by the velocity of explosive detonation. As the detonation velocity decreases, the peak pressure of the head part of the pulse decreases, and the duration of its rise increases, while a low-amplitude pulse of long duration contributes to better crushing of a rock mass with the least effect of prefracture. Using explosives with a reduced detonation velocity allows reducing the “surplus” impact on a rock mass and thus reducing the intensity of prefracture in the zone of controlled crushing during a blast. This is because the individual pieces will be weakened to a lesser extent after a blast and as a result, the yield of undersize when crushing rock into crushed stone will be reduced.
For more information, see the article:
📌 Khokhlov S.V., Vinogradov Yu.I., Makkoev V.A., Abiyev Z.A. Effect of explosive detonation velocity on the degree of rock pre-fracturing during blasting. Mining Science and Technology (Russia). 2024;9(2):85-96. https://doi.org/10.17073/2500-0632-2023-11-177
Subscribe to the journal's Telegram channel:
👉t.iss.one/MinSciTech👈
#inenglish #MST #prefracture #crushing #blast #stress #microfracture #fracture #density #detonation #velocity #fines
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Effect of explosive detonation velocity on the degree of rock pre-fracturing during blasting | Khokhlov | Mining Science and Technology…
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💥 How does the detonation velocity of explosives affect rock fracturing?
In quarries for building stone extraction, up to 30% of the rock turns into fines after blasting and crushing, reducing economic efficiency. One of the key factors is the prefracture zones formed during explosive detonation.
🔬 What was studied?
1️⃣ Explosive detonation velocity (ranging from 2 to 5.2 km/s).
2️⃣ Stresses in the rock mass during blasting.
3️⃣ Microfracturing using X-ray microtomography.
📊 Results:
✔️ The size of the prefracture zone increases from 33R to 77R (where R is the charge radius) as detonation velocity rises.
✔️ Microfracture density (N) depends on the distance from the charge:
• Near zone (10R): from 5,000 to 13,800 pcs/cm³ (exponential growth).
• Far zone (70R): from 0 to 200 pcs/cm³ (linear growth).
💡 Practical conclusions:
➡️ Using explosives with reduced detonation velocity minimizes prefracture zones and decreases fines yield.
➡️ Optimizing blasting parameters allows controlled rock fragmentation and increases the output of marketable fractions.
For more information, see the article:
📌 Khokhlov S.V., Vinogradov Yu.I., Makkoev V.A., Abiyev Z.A. Effect of explosive detonation velocity on the degree of rock pre-fracturing during blasting. Mining Science and Technology (Russia). 2024;9(2):85-96. https://doi.org/10.17073/2500-0632-2023-11-177
Subscribe to our Telegram channel:
👉 t.iss.one/MinSciTech 👈
#InEnglish #MST #Prefracture #CrushingToRubble #BlastStresses #Microfracture #FractureDensity #DetonationVelocity #FinesYields #Rock #Blast #Explosives #Quarry #Stone #Fines #Stress #Wave #Charge #Radius #Density #Cracks #Fragmentation #Impact #Velocity #Energy #Zones #Array #Control #Efficiency #Laboratory #Tomography #Results #Optimization #Parameters #Marketable #Output
In quarries for building stone extraction, up to 30% of the rock turns into fines after blasting and crushing, reducing economic efficiency. One of the key factors is the prefracture zones formed during explosive detonation.
🔬 What was studied?
1️⃣ Explosive detonation velocity (ranging from 2 to 5.2 km/s).
2️⃣ Stresses in the rock mass during blasting.
3️⃣ Microfracturing using X-ray microtomography.
📊 Results:
✔️ The size of the prefracture zone increases from 33R to 77R (where R is the charge radius) as detonation velocity rises.
✔️ Microfracture density (N) depends on the distance from the charge:
• Near zone (10R): from 5,000 to 13,800 pcs/cm³ (exponential growth).
• Far zone (70R): from 0 to 200 pcs/cm³ (linear growth).
💡 Practical conclusions:
➡️ Using explosives with reduced detonation velocity minimizes prefracture zones and decreases fines yield.
➡️ Optimizing blasting parameters allows controlled rock fragmentation and increases the output of marketable fractions.
For more information, see the article:
📌 Khokhlov S.V., Vinogradov Yu.I., Makkoev V.A., Abiyev Z.A. Effect of explosive detonation velocity on the degree of rock pre-fracturing during blasting. Mining Science and Technology (Russia). 2024;9(2):85-96. https://doi.org/10.17073/2500-0632-2023-11-177
Subscribe to our Telegram channel:
👉 t.iss.one/MinSciTech 👈
#InEnglish #MST #Prefracture #CrushingToRubble #BlastStresses #Microfracture #FractureDensity #DetonationVelocity #FinesYields #Rock #Blast #Explosives #Quarry #Stone #Fines #Stress #Wave #Charge #Radius #Density #Cracks #Fragmentation #Impact #Velocity #Energy #Zones #Array #Control #Efficiency #Laboratory #Tomography #Results #Optimization #Parameters #Marketable #Output
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How to Improve Block Stone Quality with Blasting Technology?
The extraction of block stone is a critical process in the construction materials industry, where maintaining the integrity of the material for further use is paramount. The key challenge lies in minimizing induced fracturing and surface roughness of the blocks.
🔹 Key Aspects of the Technology:
✔️ Stress wave interaction – plays a decisive role in forming the main rupture between blastholes.
✔️ Optimal charge parameters – blasthole spacing, blast product pressure, and linear charge density influence the zone of induced fracturing.
✔️ Orientation of the rupture plane – aligning it with natural fractures in the rock mass increases the yield of high-quality blocks.
🔹 Research Findings:
✔️Numerical modeling confirmed that adjusting charge parameters localizes the fracture zone.
✔️Reducing blasthole spacing while increasing charge size within limits ensures directional splitting.
For more information, see the article:
📌 Kovalevsky V.N., Mysin A.V., Sushkova V.I. Theoretical aspects of block stone blasting method. Mining Science and Technology (Russia). 2024;9(2):97-104. https://doi.org/10.17073/2500-0632-2023-12-187
Subscribe to our Telegram channel:
👉 t.iss.one/MinSciTech 👈
#InEnglish #MST #BlockRockMass #DrillingAndBlasting #DirectedFlow #ChargeDesign #BlastPulse #BlastPressure #StressDiagrams #DynamicStrength #Roughness #InducedFracturing #Stone #Blast #Charge #Mass #Cracks #Rock #Pressure #Strength #Granite #Tech
The extraction of block stone is a critical process in the construction materials industry, where maintaining the integrity of the material for further use is paramount. The key challenge lies in minimizing induced fracturing and surface roughness of the blocks.
🔹 Key Aspects of the Technology:
✔️ Stress wave interaction – plays a decisive role in forming the main rupture between blastholes.
✔️ Optimal charge parameters – blasthole spacing, blast product pressure, and linear charge density influence the zone of induced fracturing.
✔️ Orientation of the rupture plane – aligning it with natural fractures in the rock mass increases the yield of high-quality blocks.
🔹 Research Findings:
✔️Numerical modeling confirmed that adjusting charge parameters localizes the fracture zone.
✔️Reducing blasthole spacing while increasing charge size within limits ensures directional splitting.
For more information, see the article:
📌 Kovalevsky V.N., Mysin A.V., Sushkova V.I. Theoretical aspects of block stone blasting method. Mining Science and Technology (Russia). 2024;9(2):97-104. https://doi.org/10.17073/2500-0632-2023-12-187
Subscribe to our Telegram channel:
👉 t.iss.one/MinSciTech 👈
#InEnglish #MST #BlockRockMass #DrillingAndBlasting #DirectedFlow #ChargeDesign #BlastPulse #BlastPressure #StressDiagrams #DynamicStrength #Roughness #InducedFracturing #Stone #Blast #Charge #Mass #Cracks #Rock #Pressure #Strength #Granite #Tech
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