Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Mechanical properties and deformation mechanism of stratified cemented tailings backfill under unconfined compression
Highlights The effects of the number of stratified surface on the elastic modulus, peak strain and UCS of the SCTB samples are analyzed. DIC method can well distinguish the overall deformation of the samples from the local deformation at stratified surfaces. The macro–micro-cracks at the stratified surfaces could be divided into two types: CPSSs and CNPSSs. The deformation mechanism of the stratified surfaces was explained.
Abstract Studying the deformation mechanism of stratified cemented tailings backfill (SCTB) is of great significance to determining the reasonable strength of the backfill and reducing the filling cost. In this study, the SCTB samples with 0,1,2,3, and 4 stratified surfaces are prepared. Mechanical tests were carried out on the samples, in which the digital image correlation method and scanning electron microscopy (SEM) analyses were conducted on the layered backfill samples. The findings indicated that the existence of stratified surfaces causes a significant deterioration in the uniaxial compressive strength and elastic modulus of the SCTBs, but increases its deformation capacity. During the loading process of the SCTBs, the stratified surfaces always present a compressed state and the average strain of the SCTBs is greatly affected by the stratified surfaces. The macro–micro-cracks at the stratified surfaces could be divided into two types: cracks passing through the stratified surfaces (CPSSs) and cracks not passing through the stratified surfaces (CNPSSs). The SEM results indicated that there was a greater abundance of CNPSSs than CPSSs, meaning the stratified surfaces inhibited the propagation of micro-cracks. With the increase of the number of stratified surfaces in SCTBs, the stratified surfaces compression displacement (SSCD) of a pair of stratified surfaces decreases.
Mechanical properties and deformation mechanism of stratified cemented tailings backfill under unconfined compression
Highlights The effects of the number of stratified surface on the elastic modulus, peak strain and UCS of the SCTB samples are analyzed. DIC method can well distinguish the overall deformation of the samples from the local deformation at stratified surfaces. The macro–micro-cracks at the stratified surfaces could be divided into two types: CPSSs and CNPSSs. The deformation mechanism of the stratified surfaces was explained.
Abstract Studying the deformation mechanism of stratified cemented tailings backfill (SCTB) is of great significance to determining the reasonable strength of the backfill and reducing the filling cost. In this study, the SCTB samples with 0,1,2,3, and 4 stratified surfaces are prepared. Mechanical tests were carried out on the samples, in which the digital image correlation method and scanning electron microscopy (SEM) analyses were conducted on the layered backfill samples. The findings indicated that the existence of stratified surfaces causes a significant deterioration in the uniaxial compressive strength and elastic modulus of the SCTBs, but increases its deformation capacity. During the loading process of the SCTBs, the stratified surfaces always present a compressed state and the average strain of the SCTBs is greatly affected by the stratified surfaces. The macro–micro-cracks at the stratified surfaces could be divided into two types: cracks passing through the stratified surfaces (CPSSs) and cracks not passing through the stratified surfaces (CNPSSs). The SEM results indicated that there was a greater abundance of CNPSSs than CPSSs, meaning the stratified surfaces inhibited the propagation of micro-cracks. With the increase of the number of stratified surfaces in SCTBs, the stratified surfaces compression displacement (SSCD) of a pair of stratified surfaces decreases.
Mechanical properties and deformation mechanism of stratified cemented tailings backfill under unconfined compression
Chen, Shuaijun (Autor:in) / Jin, Aibing (Autor:in) / Zhao, Yiqing (Autor:in) / Li, Hai (Autor:in) / Wang, Jie (Autor:in)
15.03.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
SCTB , stratified cemented tailings backfill , DIC , digital image correlation , SEM , scanning electron microscope , UCS , uniaxial compressive strength , SMZ , strain measurement zone , CPSS , cracks passing through the stratified surfaces , CNPSS , cracks not passing through the , CSCZ , compressive strain concentration zone , AOI , area of interest , MB , monti-form bulge , SSCD , stratified surfaces compression displacement , Stratified cemented tailings backfill , Uniaxial compression test , Digital image correlation , Crack types , Deformation mechanism