Experimental study on energy dissipation of layered backfill under impact load

Sun, Wei; Zhang, Shengyou; Li, Jinxin; Li, Zhaoyu

doi:10.1016/j.conbuildmat.2022.128478

Cited by 28 publications

(2 citation statements)

References 13 publications

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“…Their study not only confirms that layering affects the integrity of CTB but also that as the layering angle increases from 20° to 25°, the shear strength and cohesion decreases by 35% and 43%, respectively. When it comes to energy dissipation during blasting of secondary stope, Sun et al 30 highlighted that as the number of layers increase, the absorption energy of the CTB increased gradually. In addition to these findings, the authors reported that the deformation of layered backfill mainly occurred at the layered position with a severe degree of fragmentation.…”

Section: Introductionmentioning

confidence: 99%

An experimental and numerical study of the strength development of layered cemented tailings backfill

Chiloane,

Sengani,

Mulenga

2024

Sci Rep

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The behaviour of a stratified backfilled stope in terms of strength development and stress distribution has not been well established in the field of rock engineering. Yet, the mining industries with massive ore bodies are looking into high production with a high standard of safety which is mainly governed by large excavation with backfill as a support system. It is difficult to fill these large excavations at one time. Therefore, a subsequent backfilling of the stope layer by layering is adopted, which results in a layered backfill structure. The purpose of this study was to explore the strength development, stress distribution and deformation across the stope supported by both layered and non-layered backfill. It has been observed that the backfill support system gain its strength with time, however, the layered backfill support system loses its strength when more layers are introduced, this is due to the shearing effect around the interfaces of the backfill layers. The impact of layering was validated by 3D numerical simulation. It is therefore concluded that non layered backfill support system are more suitable for stoping mining methods rather than layered support system.

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Section: Introductionmentioning

confidence: 99%

An experimental and numerical study of the strength development of layered cemented tailings backfill

Chiloane,

Sengani,

Mulenga

2024

Sci Rep

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“…The dynamic compressive strength of CTB is usually obtained by performing the Split Hopkinson Pressure Bar (SHPB) tests on CTB samples (Zhang et al, 2017;Sun et al, 2022). Many experiments have shown that CTB materials' mechanical behavior differs at different strain rates.…”

Section: Introductionmentioning

confidence: 99%

Initial pore distribution characteristics and crack failure development of cemented tailings backfill under low impact amplitude

Zheng,

Liu,

Guo

et al. 2023

Front. Earth Sci.

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The stability of the cemented paste backfill is threatened by the dynamic disturbance during the excavation of the surrounding ore body. In this paper, the computerized tomography (CT) and Split Hopkinson Pressure Bar (SHPB) tests were conducted to explore the initial pore distribution characteristics of the cemented tailings backfill (CTB) and the development of the crack under low impact amplitude. SHPB tests were conducted with impact amplitudes of 34, 37, and 39 mV, respectively. Results show that the initial pores of CTB were steadily distributed with the height of CTB. The CTB contained many initial pores with similar pore size distribution characteristics, and the largest number of pores is between 0.1 and 0.3 mm. Most of the cracks in CTB after low impact amplitude develop and expand along the initial pores, and the damage of CTB mainly exists in shear cracks. A dependence has been established that the dynamic uniaxial compressive strength of the CTB increases, the total crack volume first increases and then decreases, and the number of cracks increases as the impact amplitude increases. The research results can provide a valuable reference for the dynamic performance of CTB under low impact amplitude and the design of mining backfill.

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Dynamic response and deformation failure microscopic characteristics of cyclic impact–cemented tailing backfill

Yang,

Wang,

Ruan

et al. 2024

Environ Sci Pollut Res

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Experimental study on energy dissipation of layered backfill under impact load

Cited by 28 publications

References 13 publications

An experimental and numerical study of the strength development of layered cemented tailings backfill

An experimental and numerical study of the strength development of layered cemented tailings backfill

Initial pore distribution characteristics and crack failure development of cemented tailings backfill under low impact amplitude

Dynamic response and deformation failure microscopic characteristics of cyclic impact–cemented tailing backfill

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