Study of Testing Method for Dynamic Initiation Toughness of Sandstone under Blasting Loading

Xiao, Dingquan; Zhu, Zheming; Hu, Rong; Li, Lin

doi:10.1155/2018/1043298

Cited by 16 publications

(5 citation statements)

References 15 publications

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“…This study is a continuation of previous works [32,37,43,47] in which dolomite was subjected to experimental testing, constitutive modeling, and numerical simulations of blasting. Other researchers conducted a similar analysis of sandstone with a sin-gle pre-crack [48]. The authors of the present study also previously conducted small-scale blasting tests using cylindrical dolomite specimens.…”

Section: Introductionmentioning

confidence: 80%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Baranowski

Kucewicz

Pytlik

et al. 2022

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A study of dolomite rock material failure using a simple small-scale blast setup is presented. Laboratory tests were conducted using disc specimens drilled with a borehole in the center. A detonation cord and a blasting cap were fitted inside the borehole to induce cracking and fracturing of the specimens. The specimens were inserted between two steel plates, which were compressed against the specimen using bolt screws. Prior to testing, the most suitable screw torque for constraining the vertical displacement of the specimen surfaces without compressing the specimen was selected based on numerical simulations. Then, the experimental tests with the blasting cap were simulated using the Johnson-Holmquist II (JH-2) material model, and the properties of the blasting cap were determined and verified in two special tests with a lead specimen. Possessing the validated model, the influence of specimen thickness on the cracking patterns was finally analyzed. This paper presents a relatively easy method for studying rock material behavior under blast loading and for validating the numerical and constitutive models used for rock simulations.

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Section: Introductionmentioning

confidence: 80%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Baranowski

Kucewicz

Pytlik

et al. 2022

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“…Blast experiments are a useful approach to study blastinduced stress waves, gases, and cracks [8][9][10]. e most important is how to measure these parameters in a very short period.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Shock Wave Propagation of the Explosion in a Pipe with Holes by High-Speed Schlieren Method

Zhang

2020

Shock and Vibration

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The shock wave propagation of the explosion in a pipe with holes was studied by a high-speed schlieren experimental system. In the experiments, schlieren images in the explosion were recorded by a high-speed camera from parallel and perpendicular orientations, respectively, and the pressure in the air was measured by an overpressure test system. In parallel orientation, it is observed that the steel pipe blocks the propagation of blast gases, but it allows the propagation of shock waves with a symmetrical shape. In perpendicular orientation, oblique shock wave fronts were observed, indicating the propagation of explosion detonation along the charge. Shock wave velocity in the hole direction is larger than that in the nonhole direction, indicating the function of holes in controlling blast energy, that is, leading blast energy to hole direction. Furthermore, the function of holes is verified by overpressure measurements in which peak overpressure in the hole direction is 0.87 KPa, 2.8 times larger than that in the nonhole direction. Finally, the variation of pressure around the explosion in a pipe with holes was analyzed by numerical simulation, qualitatively agreeing with high-speed schlieren experiments.

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“…During the process of formation and evolution of rock mass, there are a lot of initial damages such as microcracks and microcavities in the interior [1,2]. Microcracks are activated, grown, and coalesced gradually to form macrocracks under the load, which finally causes the physical and mechanical properties of rock mass to be lowered and even be failed [3].…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study on Radial Distribution Laws of Rock Mass Damage Factors under Decoupled Charge Blasting

Pan

Zhang

Shuangying

et al. 2020

Shock and Vibration

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In this paper, the radial distribution laws of damage factors under decoupled charge blasting are studied for the optimization design of blasting parameters. Through defining the critical radial decoupling coefficient, the damage zone around the borehole is partitioned and the characteristics are described. Based on the damage factor defined by Taylor’s effective elastic modulus, the formulas of the radial distribution laws of damage factors are derived by the attenuation law of stress wave and the theory of thick-walled cylinder, respectively, which are then superposed to obtain the formula under the combined action of explosion stress wave and quasistatic gas. Experimental verification indicates that the theoretical values, which have a good correlation with the test data and are of high accuracy, can characterize the radial distribution laws of damage factors and estimate the damage range. When a radial decoupling coefficient is less than the critical value, the attenuation rate of damage factors firstly increases and then decreases with the increase of distance, and a serious damage zone is caused. Conversely, it decreases gradually, and the serious damage zone is not caused. Therefore, on the premise of stable detonation, it is necessary to apply an appropriate radial decoupling coefficient which is larger than the critical value to smooth or presplit blasting.

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Study of Testing Method for Dynamic Initiation Toughness of Sandstone under Blasting Loading

Cited by 16 publications

References 15 publications

Bulletin of the Polish Academy of Sciences: Technical Sciences

Bulletin of the Polish Academy of Sciences: Technical Sciences

Experimental Study on Shock Wave Propagation of the Explosion in a Pipe with Holes by High-Speed Schlieren Method

Theoretical Study on Radial Distribution Laws of Rock Mass Damage Factors under Decoupled Charge Blasting

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