Transportability and pressure drop of fresh cemented coal gangue-fly ash backfill (CGFB) slurry in pipe loop

Wu, Di; Yang, Bo; Liu, Yucheng

doi:10.1016/j.powtec.2015.06.072

Cited by 95 publications

(42 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, the desired slump value was 200 mm and the desired bleeding ratio was less than 2 wt %, and according to previous experience, the threshold limit value of segregation was 2 cm. All these values were based on the previous studies in References [43,[45][46][47]. All tests were carried out in the State Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technology, China, as shown in Figure 4.…”

Section: Cpb Preparationmentioning

confidence: 99%

Investigation of Hydraulic-Mechanical Properties of Paste Backfill Containing Coal Gangue-Fly Ash and Its Application in an Underground Coal Mine

et al. 2017

View full text Add to dashboard Cite

Abstract:Backfilling is widely used to control surface subsidence and stope stability to improve pillar recovery. Furthermore, it is also an effective way to process and dispose of mining waste such as coal gangue and tailings. In this study, the hydraulic-mechanical properties of cemented paste backfill materials (CPB) were investigated. Twenty-eight cemented coal gangue-fly ash backfill mixtures were prepared with different water, cement, fly ash and coal gangue content and the slump, segregation and water bleeding ratio tests were conducted. Increasing fly ash content increased the slump value and decreased the segregation value of the slurry. The uniaxial compressive strength (UCS) of the cemented coal gangue-fly ash backfill samples were tested at different curing times. Based on the test results, an optimized recipe was used for the field trial. Longwall cut and backfilling mining method was used in the 2300 mining district to recycle the coal pillar between longwall 2301 and 2302. Both stress and displacement meters were installed in the goaf and their performance was monitored continuously. An increase in stress and displacement values were observed to occur with the working face advanced (up to 325 m and 375 m, respectively); thereafter, a trend of stabilization was observed. The monitoring results suggest that the backfills can efficiently control the roof movement and surface subsidence as well as improve pillar recovery.

show abstract

Section: Cpb Preparationmentioning

confidence: 99%

Investigation of Hydraulic-Mechanical Properties of Paste Backfill Containing Coal Gangue-Fly Ash and Its Application in an Underground Coal Mine

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Many scholars have conducted creative research on backfilling mining [9][10][11][12], the results of which show that it can reduce the working face pressure and avoid main roof breaking [13][14][15][16]. e combination of the backfilling mining technology and the GER technology enables mining without using a coal pillar under multiple complex geological conditions.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation on the Mechanical Properties of Gangue Concrete as a Roadside Support Body Material for Backfilling Gob‐Side Entry Retaining

Gong

et al. 2018

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Development of a safe and economical roadside support body (RSB) material is the key to successful backfilling gob-side entry retaining (GER). By means of laboratory tests, this paper studied the effects of the water-cement ratio, aggregate content, and age on the contractibility and resistance increasing speed, compressive strength, and postpeak carrying capacity of the concrete with gangues as an aggregate. It also discussed the rationality and adaptability of gangue concrete as a RSB material for backfilling GER. e experimental results show that the compressive strength of gangue concrete increases with age, and that the strength of gangue concrete demonstrates a nonlinear decreasing trend with the increase of the cementing material's water-cement ratio. e watercement ratio in the range of 0.46-0.60 has the most significant regulation effect on the strength of gangue concrete. Mixing with a certain amount of coal gangue enhances the postpeak carrying capacity of concrete, preventing the sample from impact failure. e field experimental results report that as a RSB material, gangue concrete can meet the design and application requirements of GER with gangue backfilling mining. A RSB material featuring high safety, high waste utilization rate, fast construction speed, and low costs is provided.

show abstract

“…With the exploitation of coal and gangue, the rock movement and surface subsidence will intensify [6]. In the process of mining under villages, the problems of subsidence area governance and the treatment of the relationship between the workers and peasants have caused certain economic pressure and unstable factors to the coal enterprises [7][8][9]. Filling mining technology can effectively control the overlying strata and surface subsidence, can protect the ground structures and ecological environment and is conducive to safe production [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A New Thin Seam Backfill Mining Technology and Its Application

et al. 2017

View full text Add to dashboard Cite

Abstract:Backfill mining is an effective way to control ground subsidence and govern gangue. To solve the problem of thin coal seam mining under villages, a new thin seam backfill mining technology was proposed. This paper investigated a reasonable proportion of filling materials by experiments, designed the filling system and introduced key technologies for thin seam working face filling. Finally, an industrial test of thin seam backfill mining technology was carried out in the C1661 working face, Beixu Coal Mine. The results show that the developed filling material meets both the pumping liquidity and strength requirements of the filling body during the early and late stages. The design and equipment selection of the paste filling system were reasonable. By using the key technologies for thin seam working face filling, the time needed for working face filling, the connection and disconnection of the filling pipeline and gob-side entry retaining were all greatly shortened. The labor intensity of the workers was reduced, and the mechanization level of the mine was improved. A fill mining length of 480 m was successfully completed. With effective roof subsidence control, the ground subsidence can be reduced, and good results can be achieved. This study can contribute to the development of backfill mining in thin coal seams.

show abstract

Transportability and pressure drop of fresh cemented coal gangue-fly ash backfill (CGFB) slurry in pipe loop

Cited by 95 publications

References 23 publications

Investigation of Hydraulic-Mechanical Properties of Paste Backfill Containing Coal Gangue-Fly Ash and Its Application in an Underground Coal Mine

Investigation of Hydraulic-Mechanical Properties of Paste Backfill Containing Coal Gangue-Fly Ash and Its Application in an Underground Coal Mine

An Experimental Investigation on the Mechanical Properties of Gangue Concrete as a Roadside Support Body Material for Backfilling Gob‐Side Entry Retaining

A New Thin Seam Backfill Mining Technology and Its Application

Contact Info

Product

Resources

About