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An experimental method based on water jet test is used to study the energy distribution ratio of blasting stress wave and blasting gas; the utilization efficiency
Blasting vibration''s effect on ground vibration is essentially an energy transfer and transformation process (Hongtao et al., 2010) [1]. In engineering, the blasting vibration
The primary purpose of this paper is to review the pro- gress of the fundamental theories of rock blasting and some newly proposed blasting technologies. Section 1 introduces the current basic information on rock blasting. Section 2 de- scribes the theoretical analysis framework of rock blasting.
Based on the dynamics of explosion and fracture mechanics,the mechanism of crack initiation and its expansion of directional fracture controlled blasting by shaped charge with wedge-type liners in rock were rough studied,the blasting parameters were designed and tested in field.The results show that the energy from blasting be directionally
Blasting technology is widely applied in various engineering applications due to its cost-effectiveness and high efficiency, such as in mining, transport infrastructure construction, and building demolition. However, the occurrence of cracking in the rear row has always been a major problem that disrupts mining bench blasting. To address this
In this paper, the aim is to achieve safe, rapid excavation of an extra-long, large-cross-section highway tunnel in Eastern Tianshan, as well as to reduce production costs, simplify production processes, reduce cycle time, and improve production efficiency. In this study, we explored a new technology for smooth blasting without a detonating cord. A series of
In this study the methodology for the dry-ice blasting system assessment is presented. The parameters subject to examination were nozzle''s efficiency, cleaning speed and operational costs. On the obtained results both constructional and operational parameters can influence. Among the operational ones the initial air pressure, dry-ice
blasting technology. Xu14 and Wu15 studied the process parameters required for the static blasting technology for through-layer drilling using numerical simulation, laboratory tests, and field verification. Hao16 proposed a new construction scheme to alleviate the impact of the static blasting technology on equipment and facilities.
Liquid CO 2 phase transition fracturing (LCO 2-PTF) is an effective and economical technology used to improve the permeability of rock and coal this study, the working mechanisms of LCO 2-PTF were analysed and relevant equipment was designed to develop and promote the application of this technology utilized phase transition
Introduction. In China, coal mines generally have the characteristics of low pressure, low permeability, low saturation, and strong heterogeneity, which lead to difficulties in gas extraction, resulting in gas explosions and coal and gas outburst disasters. 1−3 Improving the coal seam permeability and gas predrainage effect has become a
The tunnel of Tianchi Pumped Storage Power Station adopts different technologies such as conventional blasting technology, HBT, and ECHBT for comparative analysis. The observation of on-site blasting effects, as shown in Figure 10, showed that the ECHBT has significant advantages in improving the flatness of the tunnel profile [ 61 ].
Liquid carbon dioxide blasting technology has a wide range of applications and is characterized by sound fracturing effects, low vibration hazards, and high safety. In order to investigate the
A simple finite element model was proposed by Mitri to calculate the seismic energy release rate and strain energy storage rate (Mitri et al., 1999). It should be mentioned that most of these studies ignore the time factor and take the unloading of in-situ stress as a quasi-static process.
Therefore, the ground test showed that the application of LCO 2-PTF technology is safe in coal mines. The adsorption ability of coal to CO 2 is stronger than CH 4 . After blasting, CO 2 diffused into the
The crushing behavior of rock via blasting is a complex energy transfer process. Three vertical boreholes were drilled on the roof of the intake airway of the 6302 working face for the blasting test. The borehole spacing was 10 m, and the depth was 51 m. 2023. "A Study on the Roof-Cutting and Pressure Releasing Technology of Roof
Field test verification further demonstrates the feasibility and effectiveness of the rapidly released stress based on blasting pressure relief theory to prevent and control rockburst.
The splitting off concrete monolith via electro-blast technology is described. High- voltage investigations were performed using the electric-discharge blasting unit with charging voltage up to 15
In this paper, roof-cutting technology of directional energy-cumulative presplitting blasting is taken as the research object. Through the numerical simulation software Ansys/Ls-dyna3D, the process of energy-cumulative blasting and non-cumulative blasting is simulated and analyzed by using the ALE algorithm. Moreover, the evolution
concentrated hydraulic blasting technology (ECHBT) combines the advantages of energy-concentrated blasting technology (ECBT) and hydraulic blasting technology (HBT)
1 INTRODUCTION The drilling-blasting method 1, 2 can cause damage to the surrounding rock, affecting the stability of the overall rock mass. 3, 4 Smooth-surface charge blasting and directional blasting technology can reduce the damage to the surrounding rock, however, these techniques still have many issues, such as
In the application of the static blasting technology, the load acting on the coal body is consistent with the measured curve of the expansion pressure, which
The aerospace industry continues to focus more and more on this goal and every improvement in technology and materials can bring significant advantages in performance, efficiency, and safety of aircraft. impactor mass and geometry, energy level of impact test, and boundary conditions. Following this standard, it is required that the
It only can simulate the in-situ stress at a shallow depth, whilst the blasting results under higher in-situ stress cannot be simulated. Xie et al. ( 2016) conducted a numerical simulation study on cut blasting in deep rock masses. The results showed that the in-situ stress inhibits the extension of rock damage.
A $100 check or money order made payable to the Commonwealth of Pennsylvania. Note: You may test for a general or surface blasting license and a demolition license in the same day, but we ask that you advise us in advance as to your wishes. There is an additional license fee of $50 for the additional certification.
The Quattro Clean snow blasting technology from ACP Systems can be a solution for such tasks. This is a dry cleaning process for full-surface and localized applications that uses liquid, recycled carbon dioxide as the cleaning medium. It is passed through a wear-free two-substance ring nozzle and expands into fine snow crystals as it
Through onsite blasting tests, it was found that the three-hole simultaneous blasting technology yielded a good blasting effect, with fewer flying
The loading form propagates outwards in the form of a spherical wave, which is equivalent to a pulse stress wave. In this work, it is simplified by representing it as a half sinusoid with equal rise and fall times and is expressed as follows: (6) p (t) = p m 2 [1 − cos (2 π f t)] where p m is the peak pressure in the blasting hole wall, f is the frequency
Liquid carbon dioxide (L-CO2) phase-transition blasting technology (LCPTB) has caused wide concern in many fields, but there is a lack of research on the initiation of the carbon dioxide fracturing pipe. Studies regarding the carbon dioxide fracturing pipe initiation are critical for controlling and optimizing the LCPTB. Therefore,
CDPTB is a non-explosive blasting technology, which uses the rapid expansion characteristics of liquid carbon dioxide during phase change to apply energy to the surrounding medium to achieve the
The dry ice blasting technology is relatively new physical method of the surface pollution removal. The technology was developed at the beginning of 80s in Lockheed Corporation [2] as the solution for the drawbacks of the conventional cleaning methods, but the concept of the dry ice blasting reaches 1930s [3] to be patented in
Before the experiments, the L-CO 2 blasting device was filled from an L-CO 2 storage tank through the L-CO 2 filling system. The working principle and filling process of the blasting device have been described in detail in our previous research [].After filling, the blasting device was placed in the precast blasting hole, and the
To accurately analyze the impact of blasting shock waves on the elastic zone of surrounding rock on the energy storage of tunnel surrounding rock, an improved Split Hopkinson Pressure Bar Dynamic Impact Test System (SHPB) with
The results show that the energy from blasting be directionally concentrated by the joint -cutting produced by cumulative jet. The directional expansion of crack is satisfactory, field test
Pre-splitting and roof-cutting control technology refers to the directional pre-fracturing or cutting off of the roof of the mining field and roadway by explosive blasting or high-strength hydraulic fracturing [31,32,33].As shown in Figure 1, according to its application method, it can be classified into directional blasting roof cutting
4.2. Rockburst Prevention Test with DHPB The precracking blasting testing site is located at the tailgate, 330 m away from the stop line of longwall 25110. Three stations of DHPB testing site were determined for deploying these blast holes, which are 285 m, 320
This article introduces a technology of integrated presplitting blasting, which can be applied to a new nonpillar coal mining method (i.e., Gob-side Entry Retaining by Roof Cutting
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