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Mobile crushers can also be called mobile crushing plants, mobile crushers, etc. It is an inevitable product of high-tech crushing technology in the new era, and its main features are that it can be operated mobilely, can walk freely, and is more convenient for transitions, ensuring that the equipment While the production is safe, the work process is more reliable.
·Yang et al based on the rock crushing mechanism and damage mechanics described the process of rock damage and fracture under blasting as two stages the initial stage of fracture under the action
·The detonation pressure of different charge structures varies with time as shown in Fig 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
·Despite the improvement in blasting techniques rock mass damage is still inevitable and is evident in the form of increased support cost slow tunnel advancement unstable rock mass prolonged incubation period of the projects and enhanced post construction tunnel maintenance cost Space Technol 16 3 2001 pp 115 131 View PDF View
·The ventilation shaft of the Maluanshan tunnel has a design depth of 193 m and a diameter of m The Maluanshan tunnel is located in the southwest section of the Lianhuashan fault zone During blasting in rock masses the damage and destruction of rock mass is closely related to the dynamic response inside the rock mass Dividing the
·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
·Xie et al 16 determined the rock constitutive parameters through experiments based on the RHT model and analyzed the anisotropy of in situ stress and damage propagation direction during cut blasting They further proposed an improved cut blasting technology to combat the difficulty experienced in deep rock excavation
Abstract Design of cast blasting rounds and optimization of the blasting process has taken on a new and much greater importance with the emergence of overburden casting operations involving thousands of tons of explosives in each blast This paper addresses the fundamentals of blast design and optimization for explosive fragmentation and casting It indicates that one key
·Additionally the critical PPV of blasting induced damage in prestressed rock masses was studied numerically Zhu et al studied the propagation of tensile stress waves in jointed rock between the blasting source and the geophones because the five geophones were all arranged in the coal seam and the blasting position was m above the
·Abstract Blasting is a major means for excavation of rock slope and the blast induced damage to reserved rock mass must be strictly limited to ensure safety of the high slope and reduce the cost for support As a traditional and widely used technique the sonic wave testing is usually adopted to detect the extents of blasting damage but the workload of
·In the process of cyclic blasting during tunnel excavation the reserved surrounding rock sustains irreparable damage accumulation For safe tunnel construction it is imperative to understand the
·During blasting a multitude of microcracks are initiated in the vicinity of the charge holes due to shock waves [15] [16] Numerical and experimental investigation of blasting damage control of a high rock slope in a deep valley Eng Geol 237 2018 pp 12 20 / View in Scopus Google Scholar
·The relationship between strain energy rock damage fragmentation and throw in rock blasting Fragblast 1 1 99 110 1997 Article Google Scholar
·Normal dragline blast of Jayant opencast project consists of detonation of 3 8 rows involving 16 70 blastholes in a round to assess the damage caused by blasting The powder factor of to
·With the shift of coal seam mining to the deep the in situ stress of coal and rock mass increases gradually High ground stress can limit the generation of rock cracks caused by blasting and
geology blasting damage in rock introduction the development of rock mechanics as practical engineering tool in both underground and surface mining has followed Practical Rock Engineering Chapter 16 Blasting Damage in Rock Course Applied Geology GEO 31 Documents Students shared 31 documents in this course University University of
·The blasting induced rock damage on the top surface obtained from the 2D and 3D models are compared in Fig 9 Although the crack patterns are similar for both models the blasting induced rock cracks obtained from the 3D analysis are relatively larger because of the effect of the stress wave superposition when the detonation wave propagation
·Figure 16 shows the final blast induced rock damage in the cases with different spacings of the empty holes and main boreholes It can be found from the vertical view in Fig 16 that the damage of rock mass in the main blasting area in the case with the spacing of m is more severe than those in the other two cases It is because the
·The damage accumulation and strength deterioration within rock masses due to frequent disturbance loads is a significant concern in the fields of rock mass engineering and deep mining
·The geological strength index GSI is a system of rock mass characterization that was developed by Hoek 1994 and Hoek et al 1995 to link the failure criterion to engineering geology observations in the most complete description of the current use of the GSI and the Hoek Brown criterion is given in a chapter entitled Rock mass properties in
·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
In engineering blasting the determination of the range of rock blasting fracture zone has important guiding significance for blasting construction is paper proposes a method that can accurately
DOI / Corpus ID 129922122; Rock damage control in bedrock blasting excavation for a nuclear power plant article{Haibo2011RockDC title={Rock damage control in bedrock blasting excavation for a nuclear power plant} author={Li Haibo and Xia Xiang and Li Jianchun and Zhao Jian and Liu Bo and Liu Yaqun} journal={International Journal of
·Advances in understanding rock blasting mechanisms have been made through theoretical analysis 5 6 7 experiments 8 9 and numerical simulations 10 11 12 13 14 et al 16 established a
·Rock mass consists of many discontinuities such as faults joints etc and layered joints are a common kind of rock mass structure The joints affect the stress wave propagation and blasting is an economical and efficient rock fragmentation method for rock mass engineering So the rock mass fragmentation effect and construction progress are affected by
·As the temperature decreased from 5°C to 30°C the volume of rock blasting induced damage decreased by approximately 14% Additionally this paper has further investigated the effects of ignition locations free surface and borehole burdens on the blasting induced damage characteristics of frozen rock It was found that the volume of the
