Abstract
Cemented gangue backfill pier-column (CGBP) which was made of coal gangue, fly ash, cement, and water is the supporting component of the goaf in partial backfill mining or constructional backfill mining for controlling the surface subsidence of coal mining. The width-height ratio and roof-floor strength directly affect the bearing capacity of CGBP under axial compression, which is essential for the design of CGBP. Herein, the effect of width-height ratio (1:3–1:1) on the mechanical characteristics of CGBP with different curing ages under uniaxial compression was system studied through experiment, and the damage process was analyzed by ultrasonic equipment and DIC. Based on the experimental results and discrete element theory, a three-phase numerical model for CGBP was established, which considered the real aggregate shape and distribution and the mechanical characteristics of each phase. Then, the effects of the end friction coefficient and the strength ratio of roof-CGBP-floor combination on the strength and failure characteristics of CGBP (large width-height ratio: 1:1–4:1) were investigated. The results show that CGBP shows the width-height ratio effect obviously and the strength and ductility increase with the increase of the width-height ratio, and the width-height ratio effect increases with the increase of curing age and strength ratio. The end friction constraint is the main reason for the width-height ratio effect, and the higher the friction coefficient is, the larger the width-height ratio effect shows, and the width-height ratio effect disappears without end friction constraint. The increase of the width-height ratio of CGBP and the strength ratio of the roof-CGBP-floor combination increases the strength of the combination. Whether the strength of the combination is greater than that of CGBP may have a roof-floor strength threshold or a strength ratio threshold, which are between 31.44–54.11 MPa and 3.75–6.44, respectively. When the strength of the roof and floor is different, the strength of the combination is mainly controlled by the weak carrier and increases with the increase of the strength of the weak carrier. The peak strain energy of CGBP and combination increases with the increase of end friction coefficient, width-height ratio, and strength of roof and floor. The experimental and simulation results can be used to guide the design of CGBP in constructional backfill mining or partial backfill mining.
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References
Al Heib MM, Didier C, Masrouri F (2010) Improving short- and long-term stability of underground gypsum mine using partial and total backfill. Rock Mech Rock Eng 43(4):447–461. https://doi.org/10.1007/s00603-009-0066-9
Bian ZF, Zhou YJ, Zeng CL et al (2021) An discussion of the basic problems for the construction of underground pumped storage reservoir I abandoned coal mines. J China Coal Soc 46(10):3308–3318. https://doi.org/10.13225/j.cnki.jccs.yg21.0392
Blaber J, Adair B, Antoniou A (2015) Ncorr: Open-Source 2D Digital Image Correlation Matlab Software. Exp Mech 55(6):1105–1122. https://doi.org/10.1007/s11340-015-0009-1
Cao S, Zheng D, Yilmaz E et al (2020) Strength development and microstructure characteristics of artificial concrete pillar considering fiber type and content effects. Constr Build Mater 256:119408. https://doi.org/10.1016/j.conbuildmat.2020.119408
Chen SJ, Yin DW, Cao FW et al (2016) An overview of integrated surface subsidence-reducing technology in mining areas of China. Nat Hazards 81(2):1129–1145. https://doi.org/10.1007/s11069-015-2123-x
Chen S, Du Z, Zhang Z et al (2020a) Effects of chloride on the early mechanical properties and microstructure of gangue-cemented paste backfill. Constr Build Mater 235:117504. https://doi.org/10.1016/j.conbuildmat.2019.117504
Chen SJ, Yin DW, Ma BQ et al (2017) Mechanical characteristics and progressive failure mechanism of roof-coal pillar structure. Chin J Rock Mech Eng 36(07):1588–1598. https://doi.org/10.13722/j.cnki.jrme.2016.1282
Chen Sj, Yin DW, Hu BN et al (2020b) Study on mechanical characteristics of composite system of hard roof and filling body under strip filling. J Min Saf Eng 37(01):110–117. https://doi.org/10.13545/j.cnki.jmse.2020b.01.012
Cheng AP, Dai SY, Zhang YS et al (2019) Study on size effect of damage evolution of cemented backfill. Chin J Rock Mech Eng 38(S1):3053–3060. https://doi.org/10.13722/j.cnki.jrme.2018.1413
Deng XJ, Dong CW, Yuan ZX et al (2020) Deformation behavior of gob-side filling body of gob-side retaining entry in the deep backfilling workface. J Min Saf Eng 37(01):62–72. https://doi.org/10.13545/j.cnki.jmse.2020.01.007
Ding X, Ma T, Zhang W et al (2018) Effects by property homogeneity of aggregate skeleton on creep performance of asphalt concrete. Constr Build Mater 171:205–213. https://doi.org/10.1016/j.conbuildmat.2018.03.150
Du XJ, Feng GR, Qi TY et al (2019b) Failure characteristics of large unconfined cemented gangue backfill structure in partial backfill mining. Constr Build Mater 194:257–265. https://doi.org/10.1016/j.conbuildmat.2018.11.038
Du XJ, Feng GR, Zhang YJ et al (2019c) Bearing mechanism and stability monitoring of cemented gangue-fly ash backfill column with stirrups in partial backfill engineering. Eng Struct 188:603–612. https://doi.org/10.1016/j.engstruct.2019.03.061
Du XJ, Feng GR, Qi TY et al (2019a) Roof stability analyses of ‘water-preserved and water-stored’ coal mining with constructional backfill mining. J China Coal Soc 044(003):820–829. https://doi.org/10.13225/j.cnki.jccs.2018.6024
Feng GR, Du XJ, Guo YX, et al (2019) Basic theory of constructional backfill mining and the underground space utilization concept. J China Coal Soc 44(01):74–84. https://doi.org/10.13225/j.cnki.jccs.2018.1598
Feng GR, Xie WS, Guo YX, et al (2022) Effect of early load on mechanical properties and damage of cemented gangue backfill. Chinese Journal of Rock Mechanics and Engineering 41(4):775–784. https://doi.org/10.13722/j.cnki.jrme.2021.0829
Gan DQ, Han L, Liu ZY et al (2018) Experimental study on the size effect of compressive strength of cemented filling body. Metal Mine (01):32–36. https://doi.org/10.19614/j.cnki.jsks.201801006
Ghirian A, Fall M (2016) Strength evolution and deformation behaviour of cemented paste backfill at early ages: Effect of curing stress, filling strategy and drainage. Int J Min Sci Techno 26(5):809–817. https://doi.org/10.1016/j.ijmst.2016.05.039
Guo YX, Ran HY, Feng GR et al (2020) Effects of curing under step-by-step load on mechanical and deformation properties of cemented gangue backfill column. J Cent South Univ 27(11):3417–3415. https://doi.org/10.1007/s11771-020-4556-y
Guo YX, Ran HY, Feng GR et al (2022) Deformation and instability properties of cemented gangue backfill column under step-by-step load in constructional backfill mining. Environ Sci Pollut Res 29(2):2325–2341. https://doi.org/10.1007/s11356-021-15638-z
Guo YX, Zhao YH, Feng GR et al (2021) Study on damage size effect of cemented gangue backfill body under uniaxial compression. Chin J Rock Mech Eng 40(12):2434–2444. https://doi.org/10.13722/j.cnki.jrme.2021.0527
He Z, Zhao K, Yan Y et al (2021) Mechanical response and acoustic emission characteristics of cement paste backfill and rock combination. Constr Build Mater 288:123119. https://doi.org/10.1016/j.conbuildmat.2021.123119
Hou JF, Guo ZP, Li JB et al (2020) Study on triaxial creep test and theoretical model of cemented gangue-fly ash backfill under seepage-stress coupling. Constr Build Mater 273:121722. https://doi.org/10.1016/j.conbuildmat.2020.121722
Hu BN (1995) Pillar stability analysis in strip mining. J China Coal Soc (02):205–210. https://doi.org/10.13225/j.cnki.jccs.1995.02.020
Jiang HQ, Han J, Li YH et al (2020) Relationship between ultrasonic pulse velocity and uniaxial compressive strength for cemented paste backfill with alkali-activated slag. Nondestruct Test Eval 35(4):359–377. https://doi.org/10.1080/10589759.2019.1679140
Li M, Zhang J, Li A et al (2020a) Reutilisation of coal gangue and fly ash as underground backfill materials for surface subsidence control. J Clean Prod 254:120113. https://doi.org/10.1016/j.jclepro.2020.120113
Li Y, Qiang S, Xu W et al (2021a) Verification of concrete nonlinear creep mechanism based on meso-damage mechanics. Constr Build Mater 276:122205. https://doi.org/10.1016/j.conbuildmat.2020.122205
Li G, Cheng X, Hu L et al (2022b) Rock failure and instability from a structural perspective: insights from the shape effect. Rock Mech Rock Eng 55(2):937–952. https://doi.org/10.1007/s00603-021-02703-9
Li CJ, Xu Y, Feng MM, et al (2020b) Deformation law and failure mechanism of coal-rock-like combined body under uniaxial loading. J China Coal Soc 45(05):1773–1782. https://doi.org/10.13225/j.cnki.jccs.2019.0625
Li SL, Liu GJ, Jia RF et al (2021b) Study on friction effect and damage evolution law of end face in uniaxial compression test. Journal of Mining and Strata Control Engineering 3(03):99–108. https://doi.org/10.13532/j.jmsce.cn10-1638/td.2021b0325.001
Li YL, Lu B, Yang RS et al (2022a) Cemented backfilling mining technology with continuous mining and continuous backfilling method for underground coal mine and typical engineering cases. J China Coal Soc 47(03):1055–1071. https://doi.org/10.13225/j.cnki.jccs.2021.1612
Liu W, Chen J, Guo Z et al (2021a) Mechanical properties and damage evolution of cemented coal gangue-fly ash backfill under uniaxial compression: Effects of different curing temperatures. Constr Build Mater 305:124820. https://doi.org/10.1016/j.conbuildmat.2021.124820
Liu ZY, Gan DQ, Gan Z (2021b) Dynamic regimes of cemented backfill at early-age. J Cent South Univ 28(7):2079–2090. https://doi.org/10.1007/s11771-021-4754-2
Liu JG, Li XW, He T (2020) Application status and prospect of backfill mining in Chinese coal mines. J China Coal Soc 45(01):141–150. https://doi.org/10.13225/j.cnki.jccs.YG19.1063
Lu B, Zhang XG, Li F, et al (2017) Study and application of short-wall gangue cemented backfilling technology. J China Coal Soc 42(S1):7–15. https://doi.org/10.13225/j.cnki.jccs.2016.1416
Ma Q, Tan YL, Liu XS et al (2021) Mechanical and energy characteristics of coal–rock composite specimen with different height ratios: a numerical study based on particle flow code. Environ Earth Sci 80(8):309. https://doi.org/10.1007/s12665-021-09453-5
Moomivand H, Vutukuri VS (1996) Effect of geometry on the compressive strength of pillars. International Symposium on Mining Science and Technology 1996
Potyondy DO (2007) Simulating stress corrosion with a bonded-particle model for rock. Int J Rock Mech Min 44(5):677–691. https://doi.org/10.1016/j.ijrmms.2006.10.002
Potyondy DO, Cundall PA (2004) A bonded-particle model for rock. Int J Rock Mech Min 41(8):1329–1364. https://doi.org/10.1016/j.ijrmms.2004.09.011
Ran HY, Guo YX, Feng GR et al (2021) Creep properties and resistivity-ultrasonic-AE responses of cemented gangue backfill column under high-stress area. Int J Min Sci Techno 31(3):401–412. https://doi.org/10.1016/j.ijmst.2021.01.008
Ran HY, Guo YX, Feng GR et al (2022) (2022) Failure properties and stability monitoring of strip and column cemented gangue backfill bodies under uniaxial compression in constructional backfill mining. Environ Sci Pollut Res. https://doi.org/10.1007/s11356-022-19336-2
Song Z, Konietzky H, Herbst M (2019) Three-dimensional particle model based numerical simulation on multi-level compressive cyclic loading of concrete. Constr Build Mater 225:661–677. https://doi.org/10.1016/j.conbuildmat.2019.07.260
Sun CD, Zhang DS, Wang XF et al (2012) Large-size test on creep characteristics of high water material for filling body beside roadway. Journal of Mining & Safety Engineering 29(04):487–491
Sun Q, Zhang J, Zhou N (2018) Study and discussion of short-strip coal pillar recovery with cemented paste backfill. Int J Rock Mech Min 104:147–155. https://doi.org/10.1016/j.ijrmms.2018.01.031
Sun Q, Tian S, Sun Q et al (2019) Preparation and microstructure of fly ash geopolymer paste backfill material. J Clean Prod 225:376–390. https://doi.org/10.1016/j.jclepro.2019.03.310
Sun C, Liu F, Jiang MJ et al (2014) Size effect of compression strength and end constraint of rocks by distinct element simulation. Chin J Rock Mech Eng 33(S2):3421–3428. https://doi.org/10.13722/j.cnki.jrme.2014.s2.005
Wang ZH, Qi TY, Feng GR et al (2021a) Electrical resistivity method to appraise static segregation of gangue-cemented paste backfill in the pipeline. Int J Pres Ves Pip 192:104385. https://doi.org/10.1016/j.ijpvp.2021.104385
Wang X, Xie J, Xu J et al (2021b) Effects of Coal Mining Height and Width on Overburden Subsidence in Longwall Pier-Column Backfilling. Appl Sci-Basel 11(7):3105. https://doi.org/10.3390/app11073105
Wang Y, Lu H, Wu J (2021c) Experimental investigation on strength and failure characteristics of cemented paste backfill-rock composite under uniaxial compression. Constr Build Mater 304:124629. https://doi.org/10.1016/j.conbuildmat.2021.124629
Wang AA, Cao S, Yilmaz E (2022b) Effect of height to diameter ratio on dynamic characteristics of cemented tailings backfills with fiber reinforcement through impact loading. Constr Build Mater 322:126448. https://doi.org/10.1016/j.conbuildmat.2022.126448
Wang AA, Cao S, Yilmaz E (2022c) Influence of types and contents of nano cellulose materials as reinforcement on stability performance of cementitious tailings backfill. Constr Build Mater 344:128179. https://doi.org/10.1016/j.conbuildmat.2022.128179
Wang LT, Xiong ZQ, Su CD (2020) Analysis on the size effect and failure characteristics of filling pillars with modified high-water material. Coal Sci Technol 49(12):82–88. https://doi.org/10.13199/j.cnki.cst.2021.12.010
Wang SM, Shen YJ, Sun Q et al (2022a) Exploration on underground CO2 storage ways and technical problems in coal mining area under the background of ‘dual carbon’ target. J China Coal Soc 47(01):45–60. https://doi.org/10.13225/j.cnki.jccs.yg21.1872
Wu D, Yang B, Liu Y (2015) Transportability and pressure drop of fresh cemented coal gangue-fly ash backfill (CGFB) slurry in pipe loop. Powder Technol 284:218–224. https://doi.org/10.1016/j.powtec.2015.06.072
Wu JY, Jing HW, Yin Q et al (2020) Strength prediction model considering material, ultrasonic and stress of cemented waste rock backfill for recycling gangue. J Clean Prod 276:123189. https://doi.org/10.1016/j.jclepro.2020.123189
Wu JY, Jing HW, Gao Y et al (2022) Effects of carbon nanotube dosage and aggregate size distribution on mechanical property and microstructure of cemented rockfill. Cement Concrete Comp 127:104408. https://doi.org/10.1016/j.cemconcomp.2022.104408
Wu JY, Jing HW, Pu H, et al (2021) Macroscopic and mesoscopic mechanical properties of cemented waste rock backfill using fractal gangue. Chinese Journal of Rock Mechanics and Engineering 40(10):2083–2100. https://doi.org/10.13722/j.cnki.jrme.2021.0234
Xie J, Zhu W, Xu J et al (2016) A study on the bearing effect of pier column backfilling in the goaf of a thin coal seam. Geosci J 20(3):361–369. https://doi.org/10.1007/s12303-015-0047-9
Xie J, Zhu W, Xu J et al (2021) Impact of the mining dimensions on the stability of backfilled pier-columns. Appl Sci-Basel 11(20):9640. https://doi.org/10.3390/app11209640
Xu JL, Rao Q, Zhu WB et al (2007) Theoretical study of strip-filling to control mining subsidence. J China Coal Soc 02:119–122
Xu MF, Jin AB, Guo LJ et al (2016) Sample size effect on strength of full tailings cemented backfill. China Mining Magazine 25(05):87–92
Xu JL, Xuan DY, Zhu WB et al (2015) Study and application of coal mining with partial backfilling. J China Coal Soc 40(06):1303–1312. https://doi.org/10.13225/j.cnki.jccs.2015.3055
Xue GL, Yilmaz E (2022) Strength, acoustic, and fractal behavior of fiber reinforced cemented tailings backfill subjected to triaxial compression loads. Constr Build Mater 338:127667. https://doi.org/10.1016/j.conbuildmat.2022.127667
Yang SQ, Su CD, Xu WY (2005) Experimental and theoretical study of size effect of rock material. Engineering Mechanics 04:112–118
Yang L, Gao FQ, Wang XQ (2020a) Mechanical response and energy partition evolution of coal-rock combinations with different strength ratios. Chinese Journal of Rock Mechanics and Engineering 39(S2):3297–3305. https://doi.org/10.13722/j.cnki.jrme.2020a.0456
Yang K, Liu WJ, Dou LT, et al (2020b) Experimental investigation into interface effect and progressive instability of coal-rock combined specimen. J China Coal Soc 45(05):1691–1700. https://doi.org/10.13225/j.cnki.jccs.DY20.0294
Yilmaz E, Benzaazoua M, Belem T (2009) Effect of curing under pressure on compressive strength development of cemented paste backfill. Miner Eng 22(9–10):772–785. https://doi.org/10.1016/j.mineng.2009.02.002
Yilmaz E, Belem T, Benzaazou M (2014) Effects of curing and stress conditions on hydromechanical, geotechnical and geochemical properties of cemented paste backfill. Eng Geol 168:23–37. https://doi.org/10.1016/j.enggeo.2013.10.024
Yilmaz E, Belem T, Benzaazoua M (2015) Specimen size effect on strength behavior of cemented paste backfills subjected to different placement conditions. Eng Geol 185:52–62. https://doi.org/10.1016/j.enggeo.2014.11.015
Yin DW, Chen SJ, Sun XZ, et al (2021) Effects of interface angles on properties of rock-cemented coal gangue-fly ash backfill bi-materials. Geomech Eng 24(1):81–89. https://doi.org/10.12989/gae.2021.24.1.081
You MQ, Hua AZ (1997) The size effect of uniaxial copression of rock specimen and support capacity of ore pillar. J China Coal Soc (01):39–43. https://doi.org/10.13225/j.cnki.jccs.1997.01.008
You MQ, Zou YF (2000) Discussion on heterogeneity of rock material and size effect on specimen strength. Chin J Rock Mech Eng 19(03):391–395
Zhang QL, Wang XM (2007) Performance of cemented coal gangue backfill. J Cent South Univ T 14(2):216–219. https://doi.org/10.1007/s11771−007−0043−y
Zhang XG, Lin J, Liu JX et al (2017) Investigation of hydraulic-mechanical properties of paste backfill containing coal gangue-fly ash and its application in an underground coal mine. Energies 10(9):1309. https://doi.org/10.3390/en10091309
Zhang H, Cao S, Yilmaz E (2022) Influence of 3D-printed polymer structures on dynamic splitting and crack propagation behavior of cementitious tailings backfill. Constr Build Mater 343:128137. https://doi.org/10.1016/j.conbuildmat.2022.128137
Zhang XG, Zhang SC (2020) Experimental investigation on mechanical properties of in situ cemented paste backfill containing coal gangue and fly ash. Adv Civ Eng 2020.https://doi.org/10.1155/2020/7964267
Zhang X, Zhao J, Xin L (2021) Monitoring and assessment of cemented paste backfill containing coal gangue and fly ash in an underground mine. Adv Mater Sci Eng 2021.https://doi.org/10.1155/2021/5946148
Zhao K, Huang M, Zhou Y et al (2022) Synergistic deformation in a combination of cemented paste backfill and rocks. Constr Build Mater 317:125943. https://doi.org/10.1016/j.conbuildmat.2021.125943
Zhao K, Huang M, Yan YJ et al (2021) Study on mechanical properties and synergistic deformation characteristics of tailings cemented filling assembled material body with different lime-sand ratios. Chinese Journal of Rock Mechanics and Engineering 40(S1):2781–2789. https://doi.org/10.13722/j.cnki.jrme.2020.0692
Zhou BJ, Xu HJ, Ni HM (2010) The small aspect ratio backfill gob-side entry retaining stability. J China Coal Soc 35(S1):33–37. https://doi.org/10.13225/j.cnki.jccs.2010.s1.013
Zhu W, Xu J, Xu J et al (2017) Pier-column backfill mining technology for controlling surface subsidence. Int J Rock Mech Min 96:58–65. https://doi.org/10.1016/j.ijrmms.2017.04.014
Zhu XJ, Guo GL, Liu H et al (2019a) Experimental research on strata movement characteristics of backfill-strip mining using similar material modeling. B Eng Geol Environ 78(4):2151–2167. https://doi.org/10.1007/s10064-018-1301-y
Zhu XJ, Guo GL, Liu H et al (2019b) Surface subsidence prediction method of backfill-strip mining in coal mining. B Eng Geol Environ 78(8):6235–6248. https://doi.org/10.1007/s10064-019-01485-3
Zhu X, Guo G, Liu H et al (2022) Stability analysis of the composite support pillar in backfill-strip mining using particle flow simulation method. Environ Earth Sci 81(4):124. https://doi.org/10.1007/s12665-022-10220-3
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This work is supported by the National Natural Science Foundation of China (51974192). The research was conducted while the first author was in receipt of financial support from the China Scholarship Council.
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Hongyu Ran: conceptualization, methodology, investigation, writing—original draft, visualization. Mohamed Elchalakani: conceptualization, supervision, funding acquisition, review and editing, project administration. Yuxia Guo: conceptualization, funding acquisition. Guorui Feng: conceptualization, funding acquisition. Bo Yang: conceptualization, supervision, project administration.
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Ran, H., Elchalakani, M., Guo, Y. et al. Effects of width-height ratio and roof-floor strength on the mechanical characteristics of cemented gangue backfill pier-column. Environ Sci Pollut Res 30, 6313–6344 (2023). https://doi.org/10.1007/s11356-022-22624-6
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DOI: https://doi.org/10.1007/s11356-022-22624-6