Mechanical properties and crack evolution of interbedded cemented tailings backfill

TANG Ya-nan; FU Jian-xin; SONG Wei-dong; ZHANG Yong-fang

doi:10.13374/j.issn2095-9389.2019.12.29.003

Volume 42 Issue 10

Oct. 2020

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TANG Ya-nan, FU Jian-xin, SONG Wei-dong, ZHANG Yong-fang. Mechanical properties and crack evolution of interbedded cemented tailings backfill[J]. Chinese Journal of Engineering, 2020, 42(10): 1286-1298. doi: 10.13374/j.issn2095-9389.2019.12.29.003

Citation:

TANG Ya-nan, FU Jian-xin, SONG Wei-dong, ZHANG Yong-fang. Mechanical properties and crack evolution of interbedded cemented tailings backfill[J]. Chinese Journal of Engineering, 2020, 42(10): 1286-1298. doi: 10.13374/j.issn2095-9389.2019.12.29.003

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Mechanical properties and crack evolution of interbedded cemented tailings backfill

doi: 10.13374/j.issn2095-9389.2019.12.29.003

TANG Ya-nan^{1, 2},
FU Jian-xin^{1, 2
,
,},
SONG Wei-dong^{1, 2},
ZHANG Yong-fang^{1, 2}

1.
School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China

More Information

Corresponding author: E-mail: fujun0011@126.com
Received Date: 2019-12-29
Publish Date: 2020-10-25

Abstract

Abstract

In the process of filling a large-scale goaf, due to the limitations in the capacity of the mixing tank, it is difficult to completely filling the goaf all once, but multiple fillings of a goaf can easily produce a layered structure in the cemented tailings backfill. This layered structure has a significant effect on the mechanical properties of the cemented tailings backfill. To analyze the influence of these structural characteristics on the mechanical properties and evolution of cracks in cemented tailings backfill, the layered cemented tailings backfill specimens with height ratios of 0.2, 0.4, 0.6 and 0.8, and cement-tailing ratios of 1∶4, 1∶6, 1∶8 and 1∶10 were made, and then the uniaxial compression test was carried out by using a GAW–2000 servo test system, and finally the crack distribution inside the cemented tailings backfill were analyzed by using 2D particle flow software(PFC-2D). The results show that: (1) the relationship between the uniaxial compressive strength and the height ratio of the layered backfill can be represented by an exponential function, and the relationship between the uniaxial compressive strength and the cement-tailing ratio can be represented by a polynomial function. The relationship between the elastic modulus and the height ratio and the cement-tailing ratio can be represented by a polynomial function. The uniaxial compressive strength and the elastic modulus are found to decrease with increase in the height ratio, and increase with increase in the cement-tailing ratio, with both being more sensitive to the cement-tailing ratio. (2) The evolution curve of cracks in the cemented tailings backfill increases gradually at first, and then rapidly increases to about 80% of the peak strength, whereby the larger is the cement-tailing ratio, the lager is the height ratio. Furthermore, the earlier the fast-rising inflection point occurs, the more easily is the backfill specimen damaged, and the curve begins to decline rapidly after exceeding the peak strength. (3) The layered backfill fails primarily by mainly shear failure, tensile failure and conjugate shear failure, and the failure is mainly concentrated in the middle weak layer. The larger is the height ratio, the denser are the cracks, the bigger is the cement-tailing ratio, and the more easily the cracks evolve to both ends.
- stage subsequent filling,
- interbedded cemented tailings backfill,
- uniaxial compressive strength,
- crack evolution law

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References(27)

References

[1]	劉光生. 充填體與圍巖接觸成拱作用機理及強度模型研究[學位論文]. 北京: 北京科技大學, 2017 Liu G S. Required Strength Model of Cemented Backfill with Research on Arching Mechanism Considering Backfill-Rock Interaction[Dissertation]. Beijing: University of Science and Technology Beijing, 2017
[2]	Chen X, Shi X Z, Zhou J, et al. Effect of overflow tailings properties on cemented paste backfill. J Environ Manage, 2019, 235: 133 doi: 10.1016/j.jenvman.2019.01.040
[3]	尹升華, 劉家明, 陳威, 等. 不同粗骨料對膏體凝結性能的影響及配比優化. 工程科學學報, 2020, 42(7):829 Yin S H, Liu J M, Chen W, et al. Optimization of the effect and formulation of different coarse aggregates on performance of the paste backfill condensation. Chin J Eng, 2020, 42(7): 829
[4]	李悅, 朱金才, 吳玉生, 等. PVA纖維水泥基材料力學性能試驗研究. 北京工業大學學報, 2018, 44(4):553 Li Y, Zhu J C, Wu Y S, et al. Research of Mechanics Properties of PVA Fiber Cementitions Composites. J Beijing Univ Technol, 2018, 44(4): 553
[5]	Xu W B, Hou Y B, Song W B, et al. Resistivity and thermal infrared precursors associated with cemented backfill mass. J Cent South Univ, 2016, 23(9): 2329 doi: 10.1007/s11771-016-3291-x
[6]	徐文彬, 田喜春, 邱宇, 等. 膠結充填體固結全程電阻率特性試驗. 中國礦業大學學報, 2017, 46(2):265 Xu W B, Tian X C, Qiu Y, et al. Experiment of the resistivity characteristic of cemented backfill mass during the whole consolidation process. J China Univ Min Technol, 2017, 46(2): 265
[7]	程愛平, 張玉山, 戴順意, 等. 單軸壓縮膠結充填體聲發射參數時空演化規律及破裂預測. 巖土力學, 2019, 40(8):2965 Cheng A P, Zhang Y S, Dai S Y, et al. Space-time evolution of acoustic emission parameters of cemented backfill and its fracture prediction under uniaxial compression. Rock Soil Mech, 2019, 40(8): 2965
[8]	程愛平, 戴順意, 張玉山, 等. 膠結充填體損傷演化尺寸效應研究. 巖石力學與工程學報, 2019, 38(增刊1): 3053 Cheng A P, Dai S Y, Zhang Y S, et al. Study on size effect of damage evolution of cemented backfill. Chin J Rock Mech Eng, 2019, 38(Suppl 1): 3053
[9]	李長洪, 魏曉明, 張立新, 等. 膠結充填體與礦石的能量匹配關系及固化時間的確定. 采礦與安全工程學報, 2017, 34(6):1116 Li C H, Wei X M, Zhang L X, et al. Energy matching relationship between cemented backfill body and ore and determination of curing time. J Min Saf Eng, 2017, 34(6): 1116
[10]	魏曉明, 郭利杰, 李長洪, 等. 高階段膠結充填體強度空間變化規律研究. 巖土力學, 2018, 39(增刊2): 45 Wei X M, Guo L J, Li C H, et al. Study of space variation law of strength of high stage cemented backfill. Rock Soil Mech, 2018, 39(Suppl 2): 45
[11]	Cao S, Yilmaz E, Song W D. Dynamic response of cement-tailings matrix composites under SHPB compression load. Construction Building Mater, 2018, 186: 892 doi: 10.1016/j.conbuildmat.2018.08.009
[12]	譚玉葉, 汪杰, 宋衛東, 等. 循環沖擊下膠結充填體動載力學特性試驗研究. 采礦與安全工程學報, 2019, 36(1):184 Tan Y Y, Wang J, Song W D, et al. Experimental study on mechanical properties of cemented tailings backfill under cycle dynamic loading test. J Min Saf Eng, 2019, 36(1): 184
[13]	Cao S, Song W D. Effect of filling interval time on the mechanical strength and ultrasonic properties of cemented coarse tailing backfill. Int J Miner Process, 2017, 166: 62 doi: 10.1016/j.minpro.2017.07.005
[14]	Cao S, Song W D, Yilmaz E. Influence of structural factors on uniaxial compressive strength of cemented tailings backfill. Construction Building Mater, 2018, 174: 190 doi: 10.1016/j.conbuildmat.2018.04.126
[15]	Cao S, Yilmaz E, Song W D, et al. Loading rate effect on uniaxial compressive strength behavior and acoustic emission properties of cemented tailings backfill. Construction Building Mater, 2019, 213: 313 doi: 10.1016/j.conbuildmat.2019.04.082
[16]	Wang J, Song W D, Cao S, et al. Mechanical properties and failure modes of stratified backfill under triaxial cyclic loading and unloading. Int J Min Sci Technol, 2019, 29(5): 809 doi: 10.1016/j.ijmst.2018.04.001
[17]	汪杰, 宋衛東, 譚玉葉, 等. 水平分層膠結充填體損傷本構模型及強度準則. 巖土力學, 2019, 40(5):1731 Wang J, Song W D, Tan Y Y, et al. Damage constitutive model and strength criterion of horizontal stratified cemented backfill. Rock Soil Mech, 2019, 40(5): 1731
[18]	Xu W B, Cao Y, Liu B H. Strength efficiency evaluation of cemented tailings backfill with different stratified structures. Eng Struct, 2019, 180: 18 doi: 10.1016/j.engstruct.2018.11.030
[19]	Zhang Y H, Wang X M, Wei C, et al. Dynamic mechanical properties and instability behavior of layered backfill under intermediate strain rates. Trans Nonferrous Met Soc China, 2017, 27(7): 1608 doi: 10.1016/S1003-6326(17)60183-3
[20]	張愛卿. 互層充填體力學特性及其對擋墻穩定性影響[學位論文]. 北京: 北京科技大學, 2019 Zhang A Q. Mechanical Property of Interbedded Filling Body and Its Effect on Stability of the Retaining Wall[Dissertation]. Beijing: University of Science and Technology Beijing, 2019
[21]	Yi X W, Ma G W, Fourie A. Compressive behavior of fiber-reinforced cemented paste backfill. Geotextiles Geomembranes, 2015, 43(3): 207 doi: 10.1016/j.geotexmem.2015.03.003
[22]	Yang Y Y, Deng Y, Li X K. Uniaxial compression mechanical properties and fracture characteristics of brucite fiber reinforced cement-based composites. Compos Struct, 2019, 212: 148 doi: 10.1016/j.compstruct.2019.01.030
[23]	Li W C, Fall M. Strength and self-desiccation of slag-cemented paste backfill at early ages: Link to initial sulphate concentration. Cem Concr Compos, 2018, 89: 160 doi: 10.1016/j.cemconcomp.2017.09.019
[24]	崔濤, 何浩祥, 閆維明, 等. 混雜纖維混凝土單軸受壓本構模型. 北京工業大學學報, 2019, 45(10):967 Cui T, He H X, Yan W M, et al. Uniaxial Compression Constitutive Model of Hybrid Fiber Reinforced Concrete. J Beijing Univ Technol, 2019, 45(10): 967
[25]	Xu W B, Cao P W, Tian M M. Strength development and microstructure evolution of cemented tailing backfill containing different binder types and contents. Minerals, 2018, 8(4): 167 doi: 10.3390/min8040167
[26]	Fu J X, Wang J, Song W D. Damage constitutive model and strength criterion of cemented paste backfill based on layered effect considerations. J Mater Res Technol, 2020, 9(3): 6073 doi: 10.1016/j.jmrt.2020.04.011
[27]	Liu Q S, Liu D F, Tian Y C, et al. Numerical simulation of stress-strain behaviour of cemented paste backfill in triaxial compression. Eng Geol, 2017, 231: 165 doi: 10.1016/j.enggeo.2017.10.021