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The presence of numerous open joints and complex three-dimensional (3D) geometrical characteristics in natural rock masses creates structural discontinuities that significantly impact stress-wave propagation and the rock's damage and failure behaviors. In this study, specimens featuring open joints were prepared using 3D techniques, and an …
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The improvement of safety conditions on hazardous rock slopes in civil work, mining and quarrying, and urban environments can be achieved through the use of explosives for the removal of unstable rock elements and final profiling. This technique is often applied because, in most cases, drill and blast operations, where they can be used, are cheaper and faster than …
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Hence, numerical simulation [[22], [23]] have emerged as a common method for studying the damage mechanism of rock blasting, which has effectively promoted the development of rock dynamics. Ma et al. [ 24 ] incorporated the Johnson–Holmquist constitutive model into the commercial software LS-DYNA to simulate crack propagation in rocks under ...
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Blasting is a widely employed technique for tunnel construction in mountainous regions; however, it often causes damage to the surrounding rock mass, particularly in fault fracture zones, which can lead to hazards such as rockfalls and collapses. This study examines the characteristics of damage to surrounding rock due to tunnel blasting through fault fracture …
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In rock blasting for mining production, stress waves play a major role in rock fracturing, along with explosive gases. Better energy distribution improves fragmentation and safety, lowers production costs, increases …
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First, the rock damage mode and blasting seismic characteristics under four initiation patterns were numerically studied. The rock damage degree was 19.26%, 13.42%, 17.06%, and 9.17% for the four ...
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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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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 rock mass containing guard ...
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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 …
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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 explosives, detonating and delaying techniques and in our understanding of the mechanics of rock …
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In order to research rock damage degree after blasting under cases of detonation in hard rock, the scatter diagram is fitted in this paper, and the fitting curve is shown in formula ... As shown in Fig. 16, if the crack generated by blasting surrounds a group of particles, the surrounded group of particles is regarded as a fragment, that ...
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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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Building damage due to vibration from rock blasting. August 2020; Soil Dynamics and Earthquake Engineering 138:106331; ... 4 8 Nov 12:56 22 287 16.4 12.3 13.2 3.2 3.3 .
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The cross-sectional dimensions at the top of the cavities are 2.056 m 2, 1.883 m 2, and 2.16 m 2, ... As depicted in Fig. 12a, in traditional cut blasting, rock damage progresses towards the empty hole due to the stress concentration effect. However, larger rock blocks accumulate at the bottom, consistent with the on-site test results. The ...
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The research found that rock damage near the blasting area was . ... It can be seen f rom Fig. 16 that the blasting of the latter construction will have a significant influence on the damage depth of.
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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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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 …
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Two main damage models commonly used to simulate the damage evolution of rock mass under blasting loads in LS-DYNA are the Holomquist–Johnson–Cook (HJC) model and the Riedel–Hiermaier–Thoma (RHT) model . From the study conducted by Wang, Wang (25), the RHT model is observed to define the damage distribution in the rock better and ...
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With the understanding of the damage distribution and stability fluctuation around joint under blasting loading, a new blasting safety control approach of the rock slope with joints …
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16 Blasting damage in rock 16.1 Introduction The development of rock mechanics as a practical engineering tool in both . 192 13 280KB Read more.
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The variation of acoustic wave velocities in rock mass have been shown to well characterize the range and degree of rock mass damage under blasting loads, and provide an …
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16 Blasting damage in rock 16.1 Introduction The development of rock mechanics as a practical engineering tool in both 192 13 280KB Read more. Rock Drilling and Blasting. 1 0 7MB Read more. Citation preview. TUAH USAHA SDN BHD HAZARD IDENTIFICATION, RISK ASSESMENT AND RISK CONTROL FORM NO : TUSB/OHS/HIRARC JOB DESCRIPTION :
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To study the effects of declining mechanical parameters caused by blasting excavation on slopes, we introduced the damage degree index Ds, and established a relationship between Ds and the disturbance factor D in the Hoek–Brown criterion, along with a basic quality index BQ for the rock mass. We then explored the change law for the degree of rock damage …
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This research focused on investigating the effect of initiation patterns under multi-hole blasting using numerical simulations and in-situ blasting experiments. First, the rock …
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【】17_Blasting_damage_in_rock ： 11 for nuclear power plants ： 2 Rock damage control in bedrock blasting excavation for a nuclear power plant ... For instance,Grady [15], Grady and Kipp [16,17], and Kipp and Grady [18]presented a damage model to describe the degradation of rockstiffness and strength caused by ...
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This study aims to analyze the damage evolution law of the surrounding rock mass in an ultra-deep shaft under blasting load. To achieve this, a numerical simulation method is adopted based on the blasting construction practice of Xiling Auxiliary Shaft in Sanshandao Gold Mine. The simulation utilizes a restart technology based on ANSYS/LS-DYNA and adopts the equivalent …
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16 Blasting damage in rock 16.1 Introduction The development of rock mechanics as a practical engineering tool in both . 49 1 280KB Read more. HIRARC Rock Blasting. TUAH USAHA SDN BHD HAZARD IDENTIFICATION, RISK ASSESMENT AND RISK CONTROL FORM NO : TUSB/OHS/HIRARC JOB DESCRIPTION :
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You probably already know your home or business has a problem. Cracks in the walls, foundation, or roof of your property, showing up after seemingly years of enduring limestone blasting from nearby quarries. Neighborhoods across Florida have complained for years about property damage they've sustained from nearby blasts. (Florida has several quarries: Miami, 2 …
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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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significance for rock damage control under blasting (Morlet, 1982; ... allowable vibration velocities of rock particles (ranging from 13.8 cm/s to 16.6 cm/s). Huang and Song (1999) found that the ...
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