Preprint Article Version 1 This version is not peer-reviewed

Experimental Study on Dynamic Mechanical Property of Cemented Tailings Backfill by SHPB

Version 1 : Received: 16 August 2018 / Approved: 17 August 2018 / Online: 17 August 2018 (11:14:52 CEST)

How to cite: TAN, Y.Y.; YU, X.; XU, L.H.; SONG, W.D. Experimental Study on Dynamic Mechanical Property of Cemented Tailings Backfill by SHPB. Preprints 2018, 2018080297 (doi: 10.20944/preprints201808.0297.v1). TAN, Y.Y.; YU, X.; XU, L.H.; SONG, W.D. Experimental Study on Dynamic Mechanical Property of Cemented Tailings Backfill by SHPB. Preprints 2018, 2018080297 (doi: 10.20944/preprints201808.0297.v1).

Abstract

In recent years, cemented tailings/paste backfill (CPB) become more and more important to maintain mine structure and keep mining stope to be stable in deep underground mining. Deep mining process often accompanied by blasting, rock burst and other high-speed dynamic loading. So it’s important to make research on dynamic behavior and characteristics of CPB. In this paper, a series of dynamic loading tests on CPB specimens by SHPB were taken to study the characteristic of stress-strain, dynamic strength, deformation and failure of CPB. The experimental results revealed that some CPB specimens have 1~2 lower stress peaks after reaching the peak stress before getting completely failed. The greater the cement-sand ratio was, the more obvious of strain reaction was. This property mainly showed like follows. The greater the cement-sand ratio was, the greater the dynamic compressive strength was under similar velocity impact; the dynamic compressive strength and the average strain rate were quadratic equation relationship, and the greater the cement-sand ratio was, the higher increase rate of dynamic compressive strength caused by strain rate. The dynamic compressive strength enhancement factor increased with the increase of the strain rate, and is larger than that of rock samples. The failure forms of CPB specimens under low-speed impact were almost the same as them under static uniaxial and triaxle compression. The CPB specimens were crushed broken under the critical strain rate, similar to the failure mode of low strength concrete. The experimental research results will improve our understanding the dynamic mechanical property of CPB and help to guide the strength design of deep mining backfill.

Subject Areas

dynamic loading test; CPB (cemented tailings/paste backfill); mechanics characteristic; SHPB (Split Hopkinson Pressure Bar)

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