Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Mechanical behavior, acoustic emission properties and damage evolution of cemented paste backfill considering structural feature
Highlights The mechanical properties, failure modes, and damage evolution of cemented paste backfill (CPB) are researched. CPB’s uniaxial compressive strength (UCS) decreases as the c/t ratio decreases, and as the h/H ratio increases. An exponential function relation between UCS value and c/t ratio and h/H ratio can be defined. A damage constitutive equation of layered cemented paste backfills (LCPB) is established.
Abstract Layered filling is easy to lead to layered structure of cemented paste backfill (CPB). To understand the mechanical behavior, failure modes, and damage evolution of layered cemented paste backfill (LCPB) with different structural features, the compressive strength behavior and acoustic emission (AE) characteristics of CPB samples with cement-to-tailings (c/t) ratio of 1:4, 1:6, 1:8, and 1:10, and height (h/H) ratio of 0.2, 0.4, 0.6, and 0.8 are investigated. Test results show that: The uniaxial compressive strength (UCS) and the elastic modulus of Layered cemented paste backfill (LCPB) decreases with the increases of h/H ratio and with the decreases of c/t ratio. The relations between the UCS and the elastic modulus and the c/t ratio and h/H ratio present the exponential functions. The cracks of the LCPB sample gradually expanded from the middle to both ends. With the decrease of the c/t ratio, the failure mode of the sample develops from tensile failure to combined tensile and shear failure, and the crack density increases. The acoustic emission (AE) ringing count shows that first slowly increase, then rapidly increase, and finally reduce to maintain stability. The constitutive energy and the dissipated energy all show S-shaped distribution that first slowly increasing, then rapidly increasing, and finally slowly increasing. However, the elastic energy shows an inverted U-shaped distribution that increases first then decreases. A damage constitutive equation of LCPB is established. The damage curves show a S-shaped distribution, which increases slowly first, then rapidly, and finally slowly increases to close to 1. The damage rate curves show an inverted U-shaped distribution, which first increases to the peak value, then decreases to close to 0. Ultimately, the findings of this experimental work will provide a scientific reference for the design of backfill.
Mechanical behavior, acoustic emission properties and damage evolution of cemented paste backfill considering structural feature
Highlights The mechanical properties, failure modes, and damage evolution of cemented paste backfill (CPB) are researched. CPB’s uniaxial compressive strength (UCS) decreases as the c/t ratio decreases, and as the h/H ratio increases. An exponential function relation between UCS value and c/t ratio and h/H ratio can be defined. A damage constitutive equation of layered cemented paste backfills (LCPB) is established.
Abstract Layered filling is easy to lead to layered structure of cemented paste backfill (CPB). To understand the mechanical behavior, failure modes, and damage evolution of layered cemented paste backfill (LCPB) with different structural features, the compressive strength behavior and acoustic emission (AE) characteristics of CPB samples with cement-to-tailings (c/t) ratio of 1:4, 1:6, 1:8, and 1:10, and height (h/H) ratio of 0.2, 0.4, 0.6, and 0.8 are investigated. Test results show that: The uniaxial compressive strength (UCS) and the elastic modulus of Layered cemented paste backfill (LCPB) decreases with the increases of h/H ratio and with the decreases of c/t ratio. The relations between the UCS and the elastic modulus and the c/t ratio and h/H ratio present the exponential functions. The cracks of the LCPB sample gradually expanded from the middle to both ends. With the decrease of the c/t ratio, the failure mode of the sample develops from tensile failure to combined tensile and shear failure, and the crack density increases. The acoustic emission (AE) ringing count shows that first slowly increase, then rapidly increase, and finally reduce to maintain stability. The constitutive energy and the dissipated energy all show S-shaped distribution that first slowly increasing, then rapidly increasing, and finally slowly increasing. However, the elastic energy shows an inverted U-shaped distribution that increases first then decreases. A damage constitutive equation of LCPB is established. The damage curves show a S-shaped distribution, which increases slowly first, then rapidly, and finally slowly increases to close to 1. The damage rate curves show an inverted U-shaped distribution, which first increases to the peak value, then decreases to close to 0. Ultimately, the findings of this experimental work will provide a scientific reference for the design of backfill.
Mechanical behavior, acoustic emission properties and damage evolution of cemented paste backfill considering structural feature
Wang, Jie (Autor:in) / Fu, Jianxin (Autor:in) / Song, Weidong (Autor:in) / Zhang, Yongfang (Autor:in) / Wang, Yu (Autor:in)
11.06.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Mechanical behaviour of cemented paste backfill
| British Library Conference Proceedings | 2000
| DOAJ | 2016