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A platform for research: civil engineering, architecture and urbanism
Study on triaxial creep test and theoretical model of cemented gangue-fly ash backfill under seepage-stress coupling
Highlights Creep deformation law of CGFB considering seepage-stress coupling effect was explored. A creep damage model considering seepage-stress coupling effect was established, and the reliability of the model was verified. Seepage has a significant effect on the long-term strength of CGFB.
Abstract In order to study the effects of seepage on the long-term stability of cemented gangue-fly ash backfill (CGFB), the triaxial creep test of CGFB under seepage-stress coupling was carried out in this paper. The creep deformation law of CGFB considering the seepage-stress coupling effect was explored and a creep damage constitutive model considering seepage-stress coupling effect was established. The results show that CGFB has obvious creep properties under the coupling action of seepage and stress and its creep generally has three stages: decelerating creep, constant velocity creep and accelerating creep; the higher the seepage water pressure, the larger the creep deformation and steady-state creep rate, and the shorter the time to enter the accelerated creep. The ratio of long-term strength to instantaneous strength under different seepage water pressure conditions is 0.56–0.75, and it shows that seepage has a significant effect on the long-term strength of CGFB. The improved Nishihara Masaki model considers the influence of seepage and stress level on creep parameters, and can better reflect the creep mechanical characteristics of CGFB under the underground seepage pressure and ground stress environment. The research results provide an important experimental basis for the safety and long-term stability analysis of backfill mining in underground coal mines.
Study on triaxial creep test and theoretical model of cemented gangue-fly ash backfill under seepage-stress coupling
Highlights Creep deformation law of CGFB considering seepage-stress coupling effect was explored. A creep damage model considering seepage-stress coupling effect was established, and the reliability of the model was verified. Seepage has a significant effect on the long-term strength of CGFB.
Abstract In order to study the effects of seepage on the long-term stability of cemented gangue-fly ash backfill (CGFB), the triaxial creep test of CGFB under seepage-stress coupling was carried out in this paper. The creep deformation law of CGFB considering the seepage-stress coupling effect was explored and a creep damage constitutive model considering seepage-stress coupling effect was established. The results show that CGFB has obvious creep properties under the coupling action of seepage and stress and its creep generally has three stages: decelerating creep, constant velocity creep and accelerating creep; the higher the seepage water pressure, the larger the creep deformation and steady-state creep rate, and the shorter the time to enter the accelerated creep. The ratio of long-term strength to instantaneous strength under different seepage water pressure conditions is 0.56–0.75, and it shows that seepage has a significant effect on the long-term strength of CGFB. The improved Nishihara Masaki model considers the influence of seepage and stress level on creep parameters, and can better reflect the creep mechanical characteristics of CGFB under the underground seepage pressure and ground stress environment. The research results provide an important experimental basis for the safety and long-term stability analysis of backfill mining in underground coal mines.
Study on triaxial creep test and theoretical model of cemented gangue-fly ash backfill under seepage-stress coupling
Hou, Jifeng (author) / Guo, Zhongping (author) / Li, Jinbo (author) / Zhao, Lijuan (author)
2020-11-15
Article (Journal)
Electronic Resource
English