Study on dynamic mechanical properties of phosphate rock through experimental tests and mesoscale simulation

Liu, Xiqi; Wang, Gang; Liu, Tingting; Lin, Manqing; Lei, Hongxia; Mandal, Abhay Kumar

doi:10.1007/s12517-020-05950-2

Cited by 10 publications

(2 citation statements)

References 29 publications

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“…The size of a standard-sized sphere was inputted. Subsequently, the software can automatically analyze the blasting block size in the figures, obtaining the distribution of the blasting block size under experimental conditions [23]. Figure 6 presents a selected shooting image of the explosive pile in a certain area, with the red spherical object considered as a reference.…”

Section: Analysis Of the Blasting Outcomementioning

confidence: 99%

Experimental and Numerical Study on the Effect of Three-Hole Simultaneous Blasting Technology on Open-Pit Mine Bench Blasting

Zhang,

Li,

Wei

et al. 2024

Applied Sciences

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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 issue, a three-hole simultaneous blasting technology is proposed in this study. Both numerical simulations and onsite blasting experimental testing were conducted. To aid this endeavor, the three-hole simultaneous blasting and the hole-by-hole blasting methods were adopted to comparatively analyze the severity of the damage caused to the original rock and the effect of rock fragmentation in the rear row. The obtained results highlighted that the outcome of the blast produced by the three-hole simultaneous blasting method is satisfactory, with fewer flying stones and concentrated blasting piles required. Additionally, the original rock in the rear row showed no obvious sign of tensile damage and had uniform fragmentation. It was also found that a block size of less than 60 cm accounts for 100%, while a block size of less than 50 cm accounts for 98.7% of the whole blocks, with no large blocks reported. Moreover, a penetrating horizontal crack occurred in the direction of the connection of the blast hole center when the three-hole simultaneous blasting method was adopted. This resulted in a smooth and flat rear part of the rocks at the interface. Compared to the hole-by-hole blasting method, the three-hole simultaneous blasting method improved the effective stress and displacement at each measurement point. At the measurement point directly at the front of the borehole, the maximum effective stress attained 67.9 GPa, and the maximum displacement reported was 31.9 cm. Overall, it was shown that the three-hole simultaneous blasting technology is applicable in similar applications of mine bench blasting, which is conducive to addressing the rear row original rock strain for onsite bench blasting.

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Section: Analysis Of the Blasting Outcomementioning

confidence: 99%

Experimental and Numerical Study on the Effect of Three-Hole Simultaneous Blasting Technology on Open-Pit Mine Bench Blasting

Zhang,

Li,

Wei

et al. 2024

Applied Sciences

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“…From the stress-strain curves at different strain rates, the uniaxial dynamic compressive strength of gypsum rock increases significantly with an increase in the strain rate and shows a significant correlation with the strain rate. The ratio of the dynamic compressive strength to the quasi-static compressive strength (i.e., the peak stress during uniaxial static loading process of rock specimens) was used to characterize the strength-increasing effect of rock, and was defined as the dynamic increase factor (DIF) [ 36 ]. The uniaxial compressive strength of the same batch of gypsum rock was 182.11 MPa, previously [ 37 ].…”

Section: Study On Dynamic Impact Test Of Gypsum Rockmentioning

confidence: 99%

Study on Damage Characteristics and Failure Modes of Gypsum Rock under Dynamic Impact Load

Ren

Zhang

et al. 2023

Materials

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The objective of this work was to investigate the damage characteristics and failure modes of gypsum rock under dynamic impact loading. Split Hopkinson pressure bar (SHPB) tests were performed under different strain rates. The strain rate effects on the dynamic peak strength, dynamic elastic modulus, energy density, and crushing size of gypsum rock were analyzed. A numerical model of the SHPB was established using the finite element software, ANSYS 19.0, and its reliability was verified by comparing it to laboratory test results. The results showed that the dynamic peak strength and energy consumption density of gypsum rock increased exponentially with strain rate, and the crushing size decreased exponentially with the strain rate, both findings exhibited an obvious correlation. The dynamic elastic modulus was larger than the static elastic modulus, but did not show a significant correlation. Gypsum rock fracture can be divided into crack compaction, crack initiation, crack propagation, and breaking stages, and is dominated by splitting failure. With increasing strain rate, the interaction between cracks is noticeable, and the failure mode changes from splitting to crushing failure. These results provide theoretical support for improvements of the refinement process in gypsum mines.

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Rate and negative Poisson’s ratio effects on Compressive Mechanical behaviors of Thermal-Damaged Crystalline Rocks using a grain-based model

Xu,

Wang,

Huang

et al. 2024

Bull Eng Geol Environ

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Study on dynamic mechanical properties of phosphate rock through experimental tests and mesoscale simulation

Cited by 10 publications

References 29 publications

Experimental and Numerical Study on the Effect of Three-Hole Simultaneous Blasting Technology on Open-Pit Mine Bench Blasting

Experimental and Numerical Study on the Effect of Three-Hole Simultaneous Blasting Technology on Open-Pit Mine Bench Blasting

Study on Damage Characteristics and Failure Modes of Gypsum Rock under Dynamic Impact Load

Rate and negative Poisson’s ratio effects on Compressive Mechanical behaviors of Thermal-Damaged Crystalline Rocks using a grain-based model

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