Abstract
Constructional backfill mining with cemented gangue backfill column can solve the environmental issues caused by mining activities and the accumulation of waste gangue at a low cost. To study the deformation and instability properties of cemented gangue backfill columns during the advancement of coal mining face, five step-by-step loading paths were adapted to mimic the different loading processes of the roof. The lateral deformation at different heights and axial deformation of the sample were monitored. The results show that the deformation and instability of the backfill column have the properties of loading paths and are affected by the step-by-step loading path. When stress-strength ratio (SSR) is less than 0.6, the lateral of backfill column shrinks during the cree** process. In high-stress levels, lateral creep strain develops faster than axial creep strain. The backfill column has characteristics of axial creep hardening and lateral creep softening during the step-by-step loading process. The instantaneous deformation modulus and instantaneous Poisson’s ratio show an upward trend. The strength of backfill column under the step-by-step load is related to loading paths and is no less than uniaxial compressive strength. The non-uniformity of the lateral deformation of backfill column leads to excessive localized deformation that mainly occurs in the middle, causing the overall instability. The development of cracks of backfill column under step-by-step load could be divided into 4 stages according to SSR. Under different step-by-step loading paths, the axial creep strain rate is nearly a constant before entering the accelerated creep stage. A nonlinear creep constitutive model with a creep strain rate trigger was proposed to depict the development of axial strain under step-by-step load. This research could provide a scientific reference for the design of the advancing distance and cycle for the hydraulic support, and reinforcement of the backfill column.
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Data Availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This work is supported by the National Natural Science Foundation of China (51974192), Shanxi province postgraduate education innovation project (2020SY567), Distinguished Youth Funds of National Natural Science Foundation of China (51925402), Shanxi Science and Technology Major Project (20201102004), and the Applied Basic Research Project of Shanxi Province (201801D121092).
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Yuxia Guo: conceptualization, funding acquisition, methodology, and writing-review and editing. Hongyu Ran: conceptualization, experiment, investigation, and writing-original draft. Guorui Feng: investigation, supervision, funding acquisition, and writing-review and editing. **anjie Du: writing-review and editing. Yonghui Zhao: experiment and investigation. Wenshuo **e: experiment and investigation.
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Guo, Y., Ran, H., Feng, G. et al. Deformation and instability properties of cemented gangue backfill column under step-by-step load in constructional backfill mining. Environ Sci Pollut Res 29, 2325–2341 (2022). https://doi.org/10.1007/s11356-021-15638-z
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DOI: https://doi.org/10.1007/s11356-021-15638-z