Preprint Article Version 3 NOT YET PEER-REVIEWED

A Two-Phase Model of Air Shock Wave Induced by Rock-Fall in Closed Goaf

Version 1 : Received: 16 November 2016 / Approved: 16 November 2016 / Online: 16 November 2016 (13:06:39 CET)
Version 2 : Received: 23 January 2017 / Approved: 23 January 2017 / Online: 23 January 2017 (09:15:34 CET)
Version 3 : Received: 24 January 2017 / Approved: 25 January 2017 / Online: 25 January 2017 (03:46:33 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.v3). 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.v3).

Abstract

In this paper, a two-phase model of air shock wave induced by rock-fall was described. 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, meanwhile the acceleration movement phase was derived by the theoretical analysis. A series of experiments were performed to verify the two-phase model and obtained the law of the uniform motion phase. The acceleration movement phase was taking a larger portion when height of rock-fall was higher with the observations. Experimental results of different falling heights showed good agreements with theoretical analysis values. Computational fluid dynamics (CFD) numerical simulation had been carried out to study the variation velocity with different falling height. As a result of this, the two-phase model could accurately and convenient estimating the velocity of air shock wave induced by rock-fall. The two-phase model could provide a reference and basis for estimating the air shock waves' velocity and designing the protective measures.

Subject Areas

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

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