Effects of particle size of crushed gangue backfill materials on surface subsidence and its application under buildings

Li, Meng; Zhang, Jixiong; Huang, Yanli; Zhou, Nan

doi:10.1007/s12665-017-6931-z

Cited by 48 publications

(23 citation statements)

References 22 publications

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“…According to this model, it is possible to intuitively select the CPB with the appropriate gradation of particles to fill in the goaf under known conditions of depth and ground stress. This paper mainly discusses the effect of the particle size distribution on the strength parameters of CPB, and tries to optimize the framework structure of CPB in engineering to enhance its strength and improve the filling effect, which in turn can result in improved economics and safety [71][72][73]. However, Yilmaz et al pointed out those fine particles can undergo significant consolidation settlement in the early curing stage [74].…”

Section: The Coupled Effect Of Confining Pressure and Particle Size Dmentioning

confidence: 99%

Particle Size Distribution Effects on the Strength Characteristic of Cemented Paste Backfill

Chen

et al. 2018

Minerals

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It is of great significance, for economic, environmental and security reasons, to investigate the strength characteristic of underground cemented paste backfill (CPB). Consequently, an ultrasonic test, uniaxial and triaxial compression experiment, and acoustic emission (AE) monitoring were carried out on CPB, for which the particles satisfied Talbot gradation. The homogeneity of CPB specimens was evaluated by ultrasonic pulse velocity (UPV). The stress–strain behavior and AE characteristic of CPB specimens under different Talbot indices and confining pressures were investigated. The effects of the particle size distribution and the confining pressure on the peak strength of CPB were analyzed. The strength parameter model of CPB under the coupled influence of the particle size distribution and the confining pressure was constructed based on the Mohr–Coulomb strength criterion. The results show that the peak strength of CPB is positively linear with confining pressure, however, the relationship between its strength parameters and the Talbot index can be characterized by a quadratic polynomial function. This suggests that there is an optimal gradation of particles reflected in the maximum strength of CPB.

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Section: The Coupled Effect Of Confining Pressure and Particle Size Dmentioning

confidence: 99%

Particle Size Distribution Effects on the Strength Characteristic of Cemented Paste Backfill

Chen

et al. 2018

Minerals

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“…The mining of underground mineral resources easily causes damage to the overlying strata, which results in irreparable destruction to the aquifer and some mineral resources that the current technology cannot exploit [1][2][3][4][5][6]. Moreover, the surface subsidence that occurs degenerates the plantable land, and large amounts of gangues and tailings are produced that waste land resources and pollute the environment [7][8][9]. These problems are increasingly serious with the development of mineral resources continuing to tend to the deep earth, which seriously damages the sustainable development that has been advocated for a long time [10].…”

Section: Introductionmentioning

confidence: 99%

Particle Size Distribution of Cemented Rockfill Effects on Strata Stability in Filling Mining

et al. 2018

Minerals

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It is of great significance for engineering safety, economic benefits, environmental protection, and sustainable development to investigate the strata stability in filling mining with cemented rockfill. Consequently, this paper is based on a specific coal mine where we applied the fully-mechanized longwall mining and filling and designed a cemented rockfill material for which the particles satisfied the Talbot gradation. Uniaxial and triaxial compression experiments were carried out on the cemented rockfill specimen, which obtained the relations between the mechanical parameters (Poisson ratio, elastic modulus, compressive strength, cohesive force, internal friction angle, and tensile strength) and the particle size distribution of the aggregate. The excavation and filling processes in the coal seam were simulated based on the numerical software FLAC3D. The characteristics of the displacement and stress fields of the strata when the goaf was filled by cemented rockfill with different granule gradations were discussed. The influences of the particle size distribution and mining distance on the maximum subsidence displacement of the coal seam roof, internal stress of the backfill, and the stress of the rock mass in the coalface were analyzed. The feasibility and effectiveness of the filling mining with cemented rockfill to protect the integrity of the overlying strata were discussed. The results showed that optimizing the particle size distribution of the aggregate in cemented rockfill could increase the loading capacity of the backfill to improve the filling effect, effectively control the strata movement, and decrease the stress of rock mass in the coalface to reduce the potential danger.

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“…However, during the goaf backfill using the solid wastes, the backfill materials (mixture of broken coal and rock masses) are also gradually compacted owing to being influenced by the pressure of overlying strata and their own deadweight. Moreover, the backfill materials with different mixing ratios exhibited different degrees of breakage and deformation during the compaction, leading to different effects of backfill mining on the control over the surface subsidence . Overall, investigating the compaction characteristics and the law of particle breakage of coal and rock masses during the compaction exerts guidance significance on various aspects including analyzing the prediction of surface subsidence, effect of backfill mining, and mixing proportion optimization of backfill materials.…”

Section: Introductionmentioning

confidence: 99%

Breakage law and fractal characteristics of broken coal and rock masses with different mixing ratios during compaction

Zhang

Zou

2019

Energy Science & Engineering

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Broken coal and rock masses are the major part of the goaf. The compaction characteristics of coal and rock masses and the breakage law of whose particles during compaction exert an important influence on various aspects including control of strata motion, prediction of surface subsidence, and backfill mining. In this paper, the triaxial compaction experiment on broken coal‐rock masses with different mixing ratios was carried out. The test results showed that with the increase of stresses, the strain of coal‐rock masses gradually rose while the porosity, bulking factor, and degree of compaction gradually declined. During the compaction of coal‐rock masses, the fitting curves of the strain, porosity, bulking factor, and degree of compaction with stresses of coal samples all appeared as a cubic function of stresses. The breakage behavior of coal particles underwent three stages: structure re‐arrangement and breakage of particles, particle breakage, and compression‐induced deformation of particles. With increasing stress, the crushing amount of particles gradually grew while the increase rate of the crushed particles gradually decreased and the larger the particle strength was, the lower the increase rate of the crushing amount. Additionally, in the compaction process of samples, particle breakage mainly appeared before the stress reached to 8 MPa while the coal and rock particles were hardly crushed after the stress was larger than 8 MPa. With increasing stresses, the particle size gradation of samples gradually became reasonable and the lower the particle strength of samples was, the more reasonable the particle size gradation of compacted samples. The particle size gradation of various compacted and crushed samples showed a favorable fractal characteristic. In the stage with a low stress, the value of fractal dimension D rapidly grew and the fractal dimensions D of various samples tended to be stabilized after the stress reached to a high level.

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Effects of particle size of crushed gangue backfill materials on surface subsidence and its application under buildings

Cited by 48 publications

References 22 publications

Particle Size Distribution Effects on the Strength Characteristic of Cemented Paste Backfill

Particle Size Distribution Effects on the Strength Characteristic of Cemented Paste Backfill

Particle Size Distribution of Cemented Rockfill Effects on Strata Stability in Filling Mining

Breakage law and fractal characteristics of broken coal and rock masses with different mixing ratios during compaction

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