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The Influence of Explosive and Rock Mass Properties on Blast Damage …
In rock blasting for mining production, stress waves play a major role in rock fracturing, along with explosive gases. ... it has a higher size reduction factor (22) as compared to P12 (16). The similarity between simulation and the blasting fragmentation on the increase in the fragmentation (reduced damage) with the distance and the role of ...
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Practical Rock Engineering Chapter 16 Blasting Damage in Rock
Duvall and Fogelson (1962), Langefors and Khilstrom (1973) and others, have published blast damage criteria for buildings and other surface structures. Almost all of these criteria relate …
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21. Blasting damage in rock
Duvall and Fogelson (1962), Langefors and Khilstrom (1973) and others, have published blast damage criteria for buildings and other surface structures. Almost all these …
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Damage and weakening effects of blasting on anchored rock …
Keywords: Blasting, anchored rock mass, damage mechanics, attenuation Posted Date: September 8th, 2023 ... [14-15], and blasting energy[16]. Anchor bolts attenuate propagation of stress 31 waves ...
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Numerical Investigation on Effect of Inclination and Position of
Abstract This study explores how the inclination and positioning of structural planes influence tunnel rockbursts under dynamic disturbances. Recent research has emphasized the critical role of structural planes within rock masses during tunnel rockbursts. This study utilizes PFC software to simulate rockbursts triggered by blasting stress waves and analyzes the …
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A Method to Identify Blasting-Induced Damage Zones in Rock …
Abstract. Blasting-induced damage zones in rock masses are commonly identified by changes in the ratio of the P-wave velocities before and after blast. In ultrasonic tests, water is usually adopted as the coupling medium. As the ultrasonic wave propagates in the aqueous medium, the measured P-wave velocity will be affected by the water coupling distance …
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Numerical simulations of rock blasting damage based on …
1. Introduction. Drilling and blasting is a controlled method of rock mass breakage using explosives that is commonly utilized in the mining and quarry industries, and in civil engineering constructions such as tunnels and dams (Verma and Prasad 2014, Hu et al 2017).Although rock blasting is a more efficient technique for rock breakage, it still has several …
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Innovative cut blasting method for rock excavation at depth based …
Since blasting is a complex and rapid process, the rock mass is subjected to a complicated dynamic-static coupled loading environment, making it difficult to reveal the blast-induced internal damage mechanisms through field tests (Liu et al., 2020).Numerical simulation has proven to be an effective tool for the study of blasting damage mechanisms and …
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Theoretical and numerical investigation of damage zones in deep …
Here, the derived theoretical equations are employed to assess the depth extent of damage resulting from blasting. The rock parameters are listed in Table 3, while Table 2 provides the …
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Weakly confined slotted cartridge blasting in jointed rock mass
The geological environments containing various types of joints are inevitably encountered in blasting construction, and the more complex the joint structures in jointed rock masses, the more unstable rock masses are formed [1].The presence of joints often results in unfavourable results for blasting construction [2], [3].Slotted charge blasting is a type of …
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Explosion propagation and characteristics of rock damage in …
The blasting damage to a rock mass results from the activation, expansion, and accumulation of micropores in the rock under the combined action of the blasting stress wave and detonation gas, which leads to the deterioration of the rocks' mechanical properties and reduced bearing capacity until rock failure; in other words, the damage degree ...
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Practical assessment of rock damage due to blasting
This paper presents a practical methodology to assess the rock damage from blasting by combining other methodologies.
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Fracture and Damage of Slit Charge Blasting in the Layered Rock …
In this paper, the method of model experiment and numerical simulation is used to preliminarily explore the fracture damage characteristics of slit charge blasting in the layered rock mass. The ...
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Research on blasting cumulative dynamic damage of surrounding rock …
The research found that rock damage near the blasting area was caused by high-frequency vibration, while rock damage far away from the blasting hole was caused by low-frequency vibration. ... According to Fig. 16, the blasting of the latter structure will have a considerable impact on the damage depth of surrounding rock within 15 cm of the ...
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Research on Damage Evolution Mechanism of Layered Rock …
Numerical studies were carried out to analyze the damage evolution process of intact rock and rock mass with layered joints subjected to blasting loads based on the Riedel–Hiermaier–Thoma (RHT ...
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Study on rock fracturing in smooth blasting under initial stress
Smooth blasting is widely employed in civil and mining engineering for rock contour excavation [1], [2].In the last decades, owing to the depletion of shallow resources, smooth blasting has been applied to rock perimeter excavation under high geo-stress with the development of deep tunnelling and mining [3], [4], [5].Under this scenario, the evolution of …
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Modelling of fracture intensity increase due to interacting blast …
Rock blasting is a key technique for fragmenting and modifying the properties of subsurface rock. 1 Blasting involves complex phenomena including high stress gradients, fracture mechanics, wave propagation, and fragmentation. [2], [3], [4] The creation of fragmented and fractured rock is one of the stages of mineral extraction, usually created through bench …
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Research on blasting cumulative dynamic damage of surrounding rock …
Sonic wave test of the surrounding rock. Changes in sonic wave velocity in a rock mass can better reflect the degree and range of rock mass damage following blasting and give data for studies from ...
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Calculation of Blasting Damage Zone Radius of Different Charge
Quantitative blasting technology, careful blasting construction and fine blasting management can effectively control the process of explosive energy release and rock …
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Damage Mechanism and Wave Attenuation Induced by …
the mechanism of blasting-induced crack evolution under different hydrostatic and nonhydrostatic pressures. Yang et al. [32] studied rock damage under the action of in situ stresses and the changes in critical peak particle velocity (PPV) and stress release time. Additionally, the critical PPV of blasting-induced damage in prestressed rock ...
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Difference in rock-breaking characteristics between water …
As a cost-effective method of rock excavation, drilling and blasting has been widely utilized in geotechnical engineering. 1, 2, 3 In engineering blasting, cylindrical explosive cartridges are frequently employed, creating a gap between the explosive cartridge and the borehole wall. The medium that fills the gap is called the coupling medium, and air is the most common …
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Theoretical Analysis of Rock Blasting Damage in …
The results of numerical simulation using the proposed damage model shows that the blasting damage range of rock with a damage degree of more than 0.5 very significantly reduces from 1.0 m to 0.3 m as the spacing …
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Blasting damage in rock
By far the most common technique of rock excavation is that of drilling and blasting. From the earliest days of blasting with black powder, there have been steady developments in …
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A New Safety Control Method of Blasting Excavation in High Rock …
Considerable efforts have been made to study the blasting damage or vibration in the rock mass and to minimize the harmful effect resulting from blasting for the last many years (Wu 2003; ... Figure 16 plots the curve of damage depth extension and PPV during blasting excavation. The location of PPV is at the bench just above the blasting zone.
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Numerical study on the behavior of blasting in deep rock masses
16: 586: 21.6: 5.81: 1.77: 0.282: 7.38: 3.3. ... To further analyze rock damage after blasting under in-situ stress, the volume ratio between failed elements whose damage levels are greater than 0.2 with the whole model is defined as the normalized volume of failed rock, and it is used to characterize the intensity of rock failure. ...
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21. Blasting damage in rock
Blasting damage in rock Introduction The most common technique for rock excavation is that of drilling and blasting. From the earliest days of blasting, there have been steady developments in explosives, detonating ... 16 sticks/hole 33 Half-sec Perimeter 26 45 Gurit, 7 sticks/hole and 26 Half-sec Gelamex 80, 1 stick/hole
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Numerical simulation of rock blasting under different in-situ …
In this study, the most extensive blasting damage area within the rock mass was observed when the joint angle was set at 60° and ... 16 Jan 2024. PONE-D-23-39104R1Numerical simulation of rock blasting under different in-situ stresses and …
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Damage evaluation of rock blasting based on multi-fractal study
The essence of research on rock mass blasting damage lies in accurately identifying and evaluating rock damage. Numerous initial damage defects, such as micro-cracks and …
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Numerical investigation of blasting-induced damage in cylindrical …
In rock blasting, it is generally agreed that two types of loadings, stress wave and explosion gas pressure, operate on the surrounding rock during an explosion [17], [18], [19], [20].A stress wave loading travels outward from the detonation of explosive column in a borehole, and it is immediately followed by a longer duration gas pressure loading [21], [22].
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