- منطقة بودونغ الجديدة ، شنغهاي ، الصين .
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Underwater drilling and blasting techniques have been developed to overcome the challenges posed by various subaquatic operations, including marine construction, oil and gas exploration, and underwater mining, demolition, dredging and excavation, seismic surveys and marine research. The drilling operation is followed by …
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The method for calculating drilling-and-blasting operations parameters is based on the regularities of emulsion explosives energy characteristics change, the extent of detonation velocity realization as well as physical and mechanical properties of rocks. Practical implications. A new method has been developed for calculation of drilling-and ...
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The commonly used construction methods for subsea tunnels are the immersed tube method, drilling and blasting method, and tunnel boring machine method. The drilling and blasting method is widely adopted owing to its flexible technology, strong adaptability, and limited influences on maritime navigation (Song, 2015).
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Drilling and blasting are the two most significant operations in open pit mines that play a crucial role in downstream stages. While previous research has focused on optimizing these operations as two separate parts or merely in a specific parameter, this paper proposes a system dynamic model (SDM) for drilling and blasting operations as …
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Read this article to learn about the blasting techniques adopted in underground and opencast mines. Blasting Techniques Adopted in Underground Mines: Drilling Patterns in Stone: Drilling patterns, also called shot-hole patterns, are named after the type of cut holes used and the principal patterns are: (1) Pyramid cut or cone cut (2) Wedge cut (3) …
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When the drilling and blasting method is used, the ground is shattered by the detonation of explosives within holes drilled into the solid rock. These holes are usually 25.4 to 50.8 mm (1 to 2 in) in diameter, spaced several centimeters to a meter apart in a preplanned pattern, and drilled to a depth that is dependent on the length of round ...
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The drilling-blasting method is commonly used in the construction of highway tunnels. As shown in Fig. 1, a large amount of dust will be generated during the construction process.The existence of dust will not only reduce the visibility in the workspace, shorten the service life of construction equipment and affect the radio waves …
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The Nordic countries perfected the technique of Drill and Blast and explored its technologies and state-of-the art throughout the world. Also, In Central Europe especially in the alpine countries Drill and Blast is still a competitive method in tunneling in spite the long length of tunnels.
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The conventional blasting rock excavation method is the main means of rock breakage because of its high productivity, and it is relatively inexpensive compared to other methods. However, it raises safety concerns and can negatively impact the environment. The major disturbances that may be induced by this method include flyrock, gas emissions, and …
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During the past two decades, there have been numerous technical contributions which have brought a better understanding of rock fragmentation with explosives, an improvement in drilling equipment and a noticeable evolution in the development of new explosives and blasting accessories.
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The drilling-and-blasting method is widely used in construction and reconstruction. The demolition means may be classified according to impact on a material of structures to be demolished and to forces application, where, by virtue of an impact energy type, we choose the blasting method.
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Excavation damage zone (EDZ) has a great influence on the stability and support design for tunnels. To better describe the difference of EDZ in hard rock caused by tunnel boring machine (TBM) and drilling-blasting (D&B) method, the scope and degree of EDZ were considered. The scope of EDZ was determined by the test results from similar engineering.
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Traditional blasting methods have evolved to incorporate more precise and efficient techniques that optimise mineral extraction and minimise environmental impact. ... automation in blast hole drilling improves efficiency and accuracy. Autonomous drilling rigs equipped with advanced guidance systems can precisely position blast holes, …
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In order to study the disaster process of water and mud resistant rock mass with the quasi-masonry structure and the accompanying catastrophe information of water inrush in karst tunnels by the drilling and blasting method, a new method based on the DEM and fictitious joint technology is adopted to simulate the evolution process of water …
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