Effects of curing temperature on shear behaviour of cemented paste backfill-rock interface

Fang, Kun; Fall, Mamadou

doi:10.1016/j.ijrmms.2018.10.024

Cited by 110 publications

(27 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to Equation (1), the peak specific energy of the cemented backfill could be calculated based on the stress and strain data of the cemented backfill obtained through the experiments. Then, according to Equation ( 7), the coefficient k of the cemented backfill under different filling ratios can be obtained [40,41]. The experimental and statistical results are shown in Table 2, and the representative stress-strain curve (filling ratio is 1 : 4) is shown in Figure 5.…”

Section: Parameter Determinationmentioning

confidence: 99%

A New Decision Method of Filling Ratio Based on Energy Matching of Surrounding Rock and Backfill

Zhou

Lin

2020

Geofluids

View full text Add to dashboard Cite

In order to simplify the ratio decision process of cemented backfill in underground mines and achieve fine decision of filling ratio, the research on the energy matching between surrounding rock and cemented backfill in underground mines was conducted in this study. Based on the cubic function strength model of cemented backfill, the peak specific energy equation of backfill was improved by inversion analysis of the data of filling ratio experiment, and the functional relationship between the peak specific energy and the filling ratio was obtained by regression analysis. Then, based on the energy balance principle between the deformation energy released by the excavation of the underground rock mass and the peak specific energy of the cemented backfill, considering the physical and mechanical parameters of the surrounding rock of the goaf, including bulk density, elastic modulus, and burial depth, a ratio decision model of cemented backfill is established. The application results suggested that the calculation result of the model is reliable, and it can realize the rapid and accurate decision of the ratio of cement backfill in underground mines.

show abstract

Section: Parameter Determinationmentioning

confidence: 99%

A New Decision Method of Filling Ratio Based on Energy Matching of Surrounding Rock and Backfill

Zhou

Lin

2020

Geofluids

View full text Add to dashboard Cite

show abstract

“…However, there are a few studies on the effect of ambient temperature as an influencing factor on the performance of CPB. In addition, some studies only investigated the effect of a single factor on CPB performance [14,15].…”

Section: Introductionmentioning

confidence: 99%

Influence of Binder Types and Temperatures on the Mechanical Properties and Microstructure of Cemented Paste Backfill

Chen

Wang

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

In order to study the influence of burial depth or fire on the core area of cemented paste backfill (CPB), the experiment of CPB with different types of binder and temperature was carried out. Three types of binders, red mud (RM), Portland cement (PC), and slag cement (SC), are used and tested at 20°C, 40°C, 60°C, and 80°C. The macroperformance and microstructural evolution of CPB are analyzed using slump, uniaxial compressive strength (UCS), X-ray diffraction, and scanning electron microscopy (SEM). The results show that the coupled effects of binder type and temperature have a significant impact on the macroscopic performance and microstructural evolution of CPB. The CPB slump prepared with three types of binder meets the production requirement of the mine. Regardless of curing temperature and curing time, the uniaxial compressive strength of CPB samples with PC and SC is much higher than that of CPB samples with red mud. When cured for 12 hours, the uniaxial compressive strength of CPB samples containing PC and SC increases first, then decreases, and finally increases again with the increase of temperature. However, with the increase of temperature, the uniaxial compressive strength of CPB samples containing RM only increases first and then decreases. When the curing temperature is less than 40°C, the main reason for the increase in UCS was attributed to the fact that the temperature increase accelerates the hydration reaction and improves the density of the sample. When the curing temperature is 60°C, the main reason for the decrease in UCS is the formation of the expansive ettringite (AFt) which destroys the internal spatial structure of the sample. When the curing temperature is 80°C, the UCS increases again due to the fact that such high temperature can destroy the crystal structure of AFt and harden the hydration product C-S-H gel.

show abstract

“…Sun and Wang et al monitored the acoustic emission characteristics of a cubic specimen during the rupture of rock-filled backfill and determined the distribution of the acoustic emission characteristics' parameter values of the backfill during the fracture process [31,32]. Fang et al studied the effect of curing temperature on the shear behavior of a rock-filled composite model interface and found that a higher curing temperatures can cause peak shear stress at the interface between early age cemented paste backfill (CPB) and rock [33]. Song et al explored the common pressure-bearing mechanism of rock-filled assemblies and found that the residual strength of the rock-backfill pillar specimen is larger than that of the rock specimen [34,35].…”

Section: Introductionmentioning

confidence: 99%

The Mechanical and Microstructural Properties of Composite Structures Made of a Cement-Tailing Backfill and Rock Core

Tan

Zhang

et al. 2020

Minerals

View full text Add to dashboard Cite

In underground metal mines that use sublevel or stage open-stope and backfilling mining methods (SSOBMMs), there is a special structure around which both sides of the rock pillar are wrapped by backfill. As a permanent part of an underground mine, how much can backfill improve the rock pillar’s compressive strength? What is the difference in the mechanical properties between the special structure and the signal rock? To explore these questions, a composite structure made of a cement-tailing backfill (CTB) and rock core (RC) was designed. Uniaxial and triaxial compressive strength tests and scanning electron microscope (SEM) were used to research the mechanical properties, failure process, failure characteristics, and microstructure characteristics of the cement-tailing backfill and rock core (CTB-RC) specimens. It was found that the full stress–strain curve of the CTB-RC specimen under triaxial compressive strength (TCS) test had two times the stress increases reaching a lower peak deviator stress two times after the RC was destroyed. The CTB can reduce the destruction and slow down the deformation speed of the inner rock cor (IRC). It can also prevent rigid slip of the IRC after it is damaged and maintain the stability and integrity of the overall structure. The findings of this study can provide some basic knowledge on the mechanical properties of the CTB-RB and provide theoretical guidance for the optimization direction of the width of the rock pillar and the room in mines using SSOBMMs.

show abstract

Effects of curing temperature on shear behaviour of cemented paste backfill-rock interface

Cited by 110 publications

References 39 publications

A New Decision Method of Filling Ratio Based on Energy Matching of Surrounding Rock and Backfill

A New Decision Method of Filling Ratio Based on Energy Matching of Surrounding Rock and Backfill

Influence of Binder Types and Temperatures on the Mechanical Properties and Microstructure of Cemented Paste Backfill

The Mechanical and Microstructural Properties of Composite Structures Made of a Cement-Tailing Backfill and Rock Core

Contact Info

Product

Resources

About