Strata migration and fracture development under continuous extraction and continuous backfill with CO2 mineralized backfill materials
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| Vydáno v: | Geomechanics and Geophysics for Geo-Energy and Geo-Resources vol. 11, no. 1 (Dec 2025), p. 50 |
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Springer Nature B.V.
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| 022 | |a 2363-8419 | ||
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| 024 | 7 | |a 10.1007/s40948-025-00970-2 |2 doi | |
| 035 | |a 3256842566 | ||
| 045 | 2 | |b d20251201 |b d20251231 | |
| 100 | 1 | |a Xu, Yujun |u Anhui University of Science and Technology, State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Huainan, China (GRID:grid.440648.a) (ISNI:0000 0001 0477 188X) | |
| 245 | 1 | |a Strata migration and fracture development under continuous extraction and continuous backfill with CO<sub>2</sub> mineralized backfill materials | |
| 260 | |b Springer Nature B.V. |c Dec 2025 | ||
| 513 | |a Journal Article | ||
| 520 | 3 | |a CO2 carbonation is currently restricted in laboratory instead of industrial application at ambient conditions. Meanwhile, few evaluations for safe storage have been made after CO2 carbonation backfill. Herein, the continuous extraction and continuous backfill (CECB) with CO2 mineralization backfill materials (CMBM) to storage CO2 was proposed. The CMBM samples were prepared and the uniaxial compressive strength (UCS) and CO2 uptake rates at various curing times and fly ash (FA)/gangue ratios were tested. The early and later strength at all ratios is more than 1 and 3.6 MPa, respectively, satisfying the requirements in underground backfill. A higher FA proportion means a higher UCS and a more significant effect of curing time on UCS as the hydration products of cement and FA contribute primarily to the early and later strength, respectively. As FA content rises, the CO2 uptake rate increases from 3.55 to 4.25 mg-CO2/g-CMBM since the alkaline oxides such as CaO in FA are higher than those in gangue. An analogue model was then constructed to simulate the overburden deformation. The ratio of the similar materials of CMBM at 7 d and F6G4 was determined to Water: Sand: CaCO3: CaSO4 of 3.56: 13.56: 0.94: 0.51. The maximum horizontal deformation of aquifuge is lower than the threshold value of 0.2–0.3 mm/m for preserving aquifer. The strain-softening parameters including cohesion, friction, dilation, and tensile strength were determined to be 0.54, 30°, 0, and 0 for UDEC simulation. The envelopes of water-conductive fractured zone (WCFZ) are saddle shaped, and the height of WCFZ is 4, 9.5, 17, and 26 m, respectively. After backfilling, there are still entire strata with thickness of 5 m between WCFZ and aquifer II. The research offers a novel way to dispose CO2 gas, solid wastes and mitigate overburden deformation, which is conducive to geological disposal of energy wastes.Article Highlights<list list-type="bullet"><list-item></list-item>The UCS and CO2 uptake rates of CMBM were analyzed.<list-item>The key ratio of physical similar materials of CMBM w as determined</list-item><list-item>The key ratio of physical similar materials of CMBM w as determinedThe key ratio of physical similar materials of CMBM w as determined</list-item><list-item>Strata migration and fracture development was illustrated under CECB with CMBM.</list-item> | |
| 651 | 4 | |a China | |
| 653 | |a Curing | ||
| 653 | |a Mechanical properties | ||
| 653 | |a Plastic deformation | ||
| 653 | |a Carbon dioxide | ||
| 653 | |a Coal mining | ||
| 653 | |a Carbonation | ||
| 653 | |a Strata | ||
| 653 | |a Compressive strength | ||
| 653 | |a Backfill | ||
| 653 | |a Deformation | ||
| 653 | |a Fly ash | ||
| 653 | |a Aquifers | ||
| 653 | |a Chemical reactions | ||
| 653 | |a Solid wastes | ||
| 653 | |a Mineralization | ||
| 653 | |a Solid impurities | ||
| 653 | |a Gangue | ||
| 653 | |a Overburden | ||
| 653 | |a Analog models | ||
| 653 | |a Calcium carbonate | ||
| 653 | |a Curing (processing) | ||
| 653 | |a Raw materials | ||
| 653 | |a Industrial applications | ||
| 653 | |a Cement | ||
| 653 | |a Tensile strength | ||
| 653 | |a Environmental | ||
| 700 | 1 | |a Ma, Liqiang |u Ministry of Education, Key Laboratory of Xinjiang Coal Resources Green Mining (Xinjiang Institute of Engineering), Urumqi, China (GRID:grid.454828.7) (ISNI:0000 0004 0638 8050); China University of Mining and Technology, School of Mines, Xuzhou, China (GRID:grid.411510.0) (ISNI:0000 0000 9030 231X) | |
| 700 | 1 | |a Wang, Yangyang |u DIMINE Co., Ltd, Changsha, China (GRID:grid.411510.0) | |
| 700 | 1 | |a Zhai, Jiangtao |u China University of Mining and Technology, School of Mines, Xuzhou, China (GRID:grid.411510.0) (ISNI:0000 0000 9030 231X) | |
| 700 | 1 | |a Zhao, Zhiyang |u China University of Mining and Technology, School of Mines, Xuzhou, China (GRID:grid.411510.0) (ISNI:0000 0000 9030 231X) | |
| 773 | 0 | |t Geomechanics and Geophysics for Geo-Energy and Geo-Resources |g vol. 11, no. 1 (Dec 2025), p. 50 | |
| 786 | 0 | |d ProQuest |t Engineering Database | |
| 856 | 4 | 1 | |3 Citation/Abstract |u https://www.proquest.com/docview/3256842566/abstract/embedded/H09TXR3UUZB2ISDL?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text |u https://www.proquest.com/docview/3256842566/fulltext/embedded/H09TXR3UUZB2ISDL?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text - PDF |u https://www.proquest.com/docview/3256842566/fulltextPDF/embedded/H09TXR3UUZB2ISDL?source=fedsrch |