Blasting-induced rock damage control in a soft broken roadway

The detonation pressure of different charge structures varies with time, as shown in Fig. 3.It can be seen from the figure that, compared with the coupling charging, the blasting shock wave of the decoupling charge has a lower peak value and a slower attenuation, which can effectively reduce the damage to the rock (Balakrishnan et al. 2020; Ding et al. 2021).

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Practical assessment of rock damage due to blasting

Rock damage due to blasting is a very important topic when it comes to ground control in surface mines, construction works, underground mines, and tunnels. ... [16]. A comprehensive review of soft computing technology applications in several mining problems can be found in Jang and Topal [17].

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Improvement and performance analysis of constitutive model for rock

Wang et al. [16] compared the performance differences between the RHT model and the HJC model by simulating granite blasting cracks, and found that the HJC model failed to accurately characterize the tensile damage of rock subjected to dynamic loads.

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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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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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Damage evolution law of multi-hole blasting igneous rock and

In order to quantitatively describe the damage degree of blasting rock mass, the relationship between fractal dimension and rock mass damage degree is further established, as shown in Eq. ... 16. Hamdi E, Romdhane NB, Le Cléac'h JM. A tensile damage model for rocks: Application to blast induced damage assessment. Comput. Geotech. 2011; 38:133 ...

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Multi-Scale Research on Blasting Damage of Rock Based on

This study proposes a fractal damage calculation method that understands the blasting damage laws at the macroscopic, mesoscopic, and microscopic scales of rock. The findings indicated that the binary graph derived from the Moments algorithm can represent minute cracks and exhibit less noise within the image. This makes the algorithm suitable for …

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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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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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16 Blasting damage in rock

Transcription . 16 Blasting damage in rock

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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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Research on cumulative damage effects and safety criterion of

However, most research has focused on predicting surrounding rock damage from a single blasting method, with few studies comparing the effects of different blasting methods on surrounding rock damage. ... By comparing the values at all locations, it is determined that the PPV cr for grades III, IV, and V surrounding rock is 16.8 cm/s, 13.7 cm/s ...

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Practical assessment of rock damage due to blasting

Rock damage due to blasting is a very important topic when it comes to ground control in surface mines, construction works, underground mines, and tunnels. Blast induced …

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16 Blasting damage in rock

blasting damage starts long before the introduction of pre-splitting or smooth blasting. As pointed out earlier, a poorly designed blast can induce cracks several metres behind the last row of blastholes.

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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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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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Fracture and Damage of Slit Charge Blasting in the …

The drilling and blasting method realizes rock fragmentation through mechanical drilling and explosive blasting and has consistently been an important construction method in related fields, such as geotechnical engineering [1,2,3] …

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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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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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Research on the damage characteristics of rock masses based …

In this paper, with the help of particle expansion blasting simulation method, sandstone is used as the research object to analyze the blasting damage characteristics of …

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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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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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Numerical investigation into the blasting-induced damage

This paper presents a 3D coupled Smoothed Particle Hydrodynamics (SPH) and Finite Element Method (FEM) model, which was developed to investigate the extent of damage zone and fracture patterns in rock due to blasting. The RHT material model was used to simulate the blasting-induced damage in rock. The effects of discontinuity persistence and high in-situ …

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Study on cyclic blasting failure characteristics and cumulative damage

Shi et al. [16] studied the blasting damage characteristics of different rows and charge structures in tunnels using LS-DYNA and obtained the optimal charge structure of each row. The results demonstrate that the rock mass damage can be reasonably controlled by combining the charge structure and number of blasting rows, and increasing the ...

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Study on Delay Time and Rock Mass Damage Patterns in Pre-Split Blasting

In order to solve the problem of ineffective pre-splitting blasting and reduce the damage caused to preserved rock bodies in the Niukutou open-pit quarry in the alpine region of Qinghai Province, China, this study investigated the influence of different delay times on the damage caused to the rock mass, combining numerical calculations with field tests. Using the …

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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 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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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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Blast damage control in jointed rock mass

All content in this area was uploaded by Sp Singh on Mar 16, 2015 ... recorded to assess the damage caused by blasting. The powder factor of 0.44 to 0.65 kg/m 3 was used depending upon the rock ...

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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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