Field application of non-blasting mechanized mining using high-frequency impact hammer in deep hard rock mine

WANG, Shao-feng; Sun, Licheng; Tang, Yu; JING, Yue; Li, Xibing; Yao, Jinrui

doi:10.1016/s1003-6326(22)66002-3

Cited by 16 publications

(7 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Subsequently, attempts are being made to apply vibration in various other domains. In 2022, scholars from universities and research institutes carried out impact-crushing tests on coal rock and concluded that impact crushing has a significant effect on reducing tool force and specific energy consumption [17]. They also cooperated in completing the development of a vibrating roadheading machine and, after a test, concluded that vibration can reduce the energy consumption of rock-breaking and thus improve the efficiency of rock breaking [18].…”

Section: Overview Of Ultrasonic High-frequency-vibration Rock-breakin...mentioning

confidence: 99%

Research on the Mechanism and Characteristics of Ultrasonically Coupled Mechanical Rock-Breaking Pre-Fracturing Technology

Liu,

Duan,

Huang

et al. 2023

Machines

View full text Add to dashboard Cite

In this paper, we propose an ultrasonically coupled mechanical rock-breaking technology, creatively design an ultrasonically coupled mechanical rock-breaking drum, concurrently develop an ultrasonic cracking simulation method based on test coordination, and study the cracking mechanism and characteristics of ultrasonically pre-broken rock in order to increase the rock-breaking efficiency of shearer drums and lengthen pickaxe service life. To further understand the theory behind ultrasonic-coupled mechanical rock breaking, the operation of a fusion drum and the implications of ultrasonic field theory in a solid medium are first examined. Second, the impact and mechanism of the ultrasonic pre-crushing of the target red sandstone are investigated in conjunction with conducting a rock uniaxial compression test and RFPA2D modeling. Furthermore, an ultrasonic pre-crushing fracturing mechanism test of the target red sandstone further reveals the effect and mechanism of ultrasonic fracturing. The efficacy of ultrasonic-coupled mechanical single-cutter cutting is then investigated using the discrete element cutting model (PFC2D) of red sandstone. The results show that under the action of ultrasonic waves with an excitation frequency of 41 kHz, cracks can effectively be produced inside the rock mass of the target red sandstone, and the cumulative amount of acoustic emission is as high as 513, which reduces the strength of the rock mass and disintegrates its internal structure; the average cut-off force of the purely mechanical rock-breaking mode is 6374 N, and that of ultrasonically coupled rock breaking is 4185 N, which is a reduction of 34.34%, and can be attributed to the fact that ultrasonic waves can loosen the structure of the rock mass. This is explained by the ability of ultrasonic vibrations to weaken the structure of rock. The coupled rock-breaking technology not only simplifies mechanical cutting and rock breaking but the lower force can also reduce a pick-shaped trunnion’s wear failure cycle. This improves the environment for subsequent pick-shaped trunnion cutting and rock breaking and prevents the pick-shaped trunnion from being subjected to high-stress loads for an extended period of time so as to prolong its working life.

show abstract

Section: Overview Of Ultrasonic High-frequency-vibration Rock-breakin...mentioning

confidence: 99%

Research on the Mechanism and Characteristics of Ultrasonically Coupled Mechanical Rock-Breaking Pre-Fracturing Technology

Liu,

Duan,

Huang

et al. 2023

Machines

View full text Add to dashboard Cite

show abstract

“…At the same time, as mining work is becoming deeper and deeper, the pressure of surrounding rocks is becoming greater and greater, and the requirements for the pressure and shear ability of the past are also becoming higher and higher. Therefore, it is necessary to develop gel materials with better durability and higher strength to meet the needs of deep mining [14]. China is a major mining country, which produces a large number of tailings every year [15].…”

Section: Introductionmentioning

confidence: 99%

Solidification Experiment of Lithium-Slag and Fine-Tailings Based Geopolymers

Dai¹,

Zeng²,

et al. 2023

Sustainability

View full text Add to dashboard Cite

Based on the pressure of environmental protection, more and more scientific researchers are trying to reuse aluminum–silicon-rich industrial wastes. In this study, activated lithium-slag and lead–zinc tailings were used as raw materials to prepare geopolymers at ratios of 3:7, 1:1, and 7:3. These geopolymers were initially cured for 12 h at 25 °C, 50 °C, 75 °C, and 100 °C and were then cured at room temperature to the specified ages. The compressive strength of each group of geopolymers was tested at the ages of 3 days, 7 days, and 28 days. The optimal group of samples was selected, that is, those with a ratio of lithium-slag to lead–zinc tailings of 7:3 and an initial curing temperature of 75 °C. After that, the heavy metal leaching test and porosity analysis test were carried out on the optimal group of samples, and the curing effect was considered to meet the requirements of the Chinese specifications. In addition, in order to reveal the mechanism of the chemical reaction, scanning electron microscopy and X-ray diffraction (XRD) were used to study the microstructure and hydration products of the C3 group cured samples. This study provides a new concept for the reuse of industrial wastes such as lithium-slag and fine-tailings.

show abstract

“…In fact, the manner of non-explosive mechanized excavation has been broadly used in soft rock strata, typically in coal mines [ 7 , 8 ], and has been preliminarily applied in hard rock mines [ 9 , 10 ] or tunnels [ 11 ]. Varied rock breakage machines have also been invented, two of which are most widely employed in the mining industry, i.e., roadheader with pick and high-frequency impact hammer with bucket teeth ( Figure 1 a,b).…”

Section: Introductionmentioning

confidence: 99%

Fatigue Behavior of Sandstone Exposed to Cyclic Point-Loading: Implications for Improving Mechanized Rock Breakage Efficiency

et al. 2023

View full text Add to dashboard Cite

During the process of mechanized excavation, rock is essentially subjected to cyclic point loading (CPL). To understand the CPL fatigue behavior of rock materials, a series of CPL tests are conducted on sandstone samples by using a self-developed vibration point-load apparatus. The effects of loading frequency and waveform on rock fatigue properties under CPL conditions are specifically investigated. The load and indentation depth histories of sandstone samples during testing are monitored and logged. The variation trends of fatigue life (failure time) under different loading conditions are obtained. Test results indicate that the fatigue life of the sandstone sample exposed to CPL is dependent on both loading frequency and waveform. As the loading frequency rises, the fatigue life of the sandstone first declines and then increases, and it becomes the lowest at 0.5 Hz. In terms of waveform, the fatigue life of the sandstone is largest under the trigonal wave and is least under the rectangular wave. These findings can provide valuable theoretical support for optimizing the rock cutting parameters to enhance the efficiency of mechanized excavation.

show abstract

Field application of non-blasting mechanized mining using high-frequency impact hammer in deep hard rock mine

Cited by 16 publications

References 24 publications

Research on the Mechanism and Characteristics of Ultrasonically Coupled Mechanical Rock-Breaking Pre-Fracturing Technology

Research on the Mechanism and Characteristics of Ultrasonically Coupled Mechanical Rock-Breaking Pre-Fracturing Technology

Solidification Experiment of Lithium-Slag and Fine-Tailings Based Geopolymers

Fatigue Behavior of Sandstone Exposed to Cyclic Point-Loading: Implications for Improving Mechanized Rock Breakage Efficiency

Contact Info

Product

Resources

About