Preprint Article Version 1 NOT YET PEER-REVIEWED

A Two-phase Model of Air Shock Wave Induced by Rock-fall in Closed Goaf

  1. School of Resources and Civil Engineering, Northeastern University, Shenyang, Liaoning Province, China
Version 1 : Received: 16 November 2016 / Approved: 16 November 2016 / Online: 16 November 2016 (13:06:39 CET)

How to cite: Ren, F.; Liu, Y.; Cao, J.; He, R.; Xu, Y.; You, X.; Zhou, Y. A Two-phase Model of Air Shock Wave Induced by Rock-fall in Closed Goaf. Preprints 2016, 2016110083 (doi: 10.20944/preprints201611.0083.v1). Ren, F.; Liu, Y.; Cao, J.; He, R.; Xu, Y.; You, X.; Zhou, Y. A Two-phase Model of Air Shock Wave Induced by Rock-fall in Closed Goaf. Preprints 2016, 2016110083 (doi: 10.20944/preprints201611.0083.v1).

Abstract

In this paper, a two-phase model of air shock wave induced by rock-fall in closed goaf was proposed. The model was made up of the uniform motion phase (velocity was close to 0 m•s-1) and the acceleration movement phase. The uniform motion phase was determined by experience and the acceleration movement phase was derived by the theoretical analysis. After this, a series of experiments were performed to verify the two-phase model and obtained the law of the uniform motion phase. By observing, the acceleration movement phase was taking a larger portion and the uniform motion phase was smaller when height of rock-fall was higher. By comparison, experimental results of different falling heights showed good agreements with theoretical analysis, which verifies the effectiveness of the two-phase model. Finally, the model was tested with computational fluid dynamics (CFD) numerical simulation by three groups of different falling height. The two-phase model could provide a reference and basis for estimating the air shock waves' velocity and design the protective measures.

Subject Areas

air shock wave; rock-fall; two-phase model; computational fluid dynamics (CFD)

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