The creep behavior of rock shear seepage under different seepage-water pressures
Tóm tắt
The long-term compression–shear–seepage coupling of rock mass is a cause of many engineering geological disasters. This study aimed to explore the creep characteristics of rock mass under different seepage conditions. Based on the shear-creep–seepage test results of shale, the shear-creep–seepage model considering damage was constructed using a series connection of the elastomer (H), a nonlinear viscoelastic body with nonlinear function
$\lambda $
(NVEP), a viscoplastic body with seepage switch
$S$
(VPB), and a viscoelastic–plastic body considering damage (VEPB). The variation law of the model parameters was analyzed, and the results showed that the model effectively described the entire change process of rock-creep characteristics, notably the deformation law of the accelerated-creep stage. The correlation coefficient
$R^{2}$
was greater than 0.98, and the fitting curve was highly consistent with the experimental data. Furthermore, the greater the seepage-water pressure, the smaller the shear stress applied in the corresponding test of each stage, and the greater the cumulative shear strain of each stage. Moreover, the seepage-water pressure had a damaging effect on the mechanical strength of the rock samples. The parameter values
$k_{1}$
and
$\lambda $
were negatively correlated with seepage-water pressure and shear stress, whereas the parameter values
$k_{2}$
and
$\eta _{1}$
were negatively correlated with seepage-water pressure and positively correlated with shear stress. The results of this study can provide theoretical support for the research and analysis of rock-mass engineering stability under long-term seepage conditions.
Tài liệu tham khảo
Chen, W.Z., Lu, C., Yu, H.D., et al.: Progress in long-term mechanical properties of clay rocks under thermo-hydro-mechanical coupling conditions. Chin. J. Rock Mech. Eng. 40(02), 233–247 (2021b). https://doi.org/10.13722/j.cnki.jrme.2020.0070
Chen, G.Q., Wan, Y., Sun, X., et al.: Research on creep behaviors and fractional order damage model of sandstone subjected to freeze-thaw cycles in different temperature ranges. Chin. J. Rock Mech. Eng. 40(10), 1962–1975 (2021a). https://doi.org/10.13722/j.cnki.jrme.2021.0064
Hou, J., Guo, Z., Li, J., et al.: Study on triaxial creep test and theoretical model of cemented gangue-fly ash backfill under seepage-stress coupling. Constr. Build. Mater. 273, 121722 (2021). https://doi.org/10.1016/j.conbuildmat.2020.121722
Li, X.Z., Ban, L.R., Qi, C.Z.: Study on the mechanical model of macro-mecro creep under high seepage pressure in brittle rocks. Rock Soil Mech. 41(12), 3987–3995 (2020). https://doi.org/10.16285/j.rsm.2020.0453
Li, Z.Y., Yang, G.S., Wei, Y.: Study on creep mechanical properties of frozen Cretaceous sandstone during thawing process. Chin. J. Rock Mech. Eng. 40(09), 1777–1788 (2021). https://doi.org/10.13722/j.cnki.jrme.2021.0413
Li, X.Z., Jia, Y.X., Yan, H.W., et al.: Mechanism of micro and macro mechanics in brittle rocks during cyclic creep under high seepage pressure. Adv. Eng. Sci., 1–12 [2023-02-13]. https://doi.org/10.15961/j.jsuese.202200431
Liu, X.L., Cao, Z.G., Chen, S.S., et al.: Seepage field analysis and optimal schedule of distributed underground reservoir in mining area. J. China Coal Soc. 44(12), 3693–3699 (2019b). https://doi.org/10.13225/j.cnki.jccs.SH19.1167
Liu, D., Pu, H., Ju, Y., et al.: A new nonlinear viscoelastic-plastic seepage-creep constitutive model considering the influence of confining pressure. Therm. Sci. 23, 116 (2019a). https://doi.org/10.2298/TSCI180621116L
Liu, Y., Chen, D.X., Wang, H., et al.: Response analysis of residual soil slope considering crack development under drying-wetting cycles. Rock Soil Mech. 42(07), 1933–1943+1982 (2021). https://doi.org/10.16285/j.rsm.2020.1504
Long, A.F., Chen, K.S., Ji, Y.X.: Experimental study on wetting-drying cycles of red clay slopes under different rainfall intensities. Chin. J. Geotechn. Eng. 41(2), 193–196 (2019)
Ma, L.Y., Hu, B., Chen, Y., et al.: Study of shear-seepage properties of intact argillaceous shale under different injection water pressures. Rock Soil Mech. 43(09), 2515–2524 (2022a). https://doi.org/10.16285/j.rsm.2021.2013
Ma, L.Y., Hu, B., Liu, J., et al.: Study on shear creep damage characteristics of shale block under impact disturbance. Chin. J. Solid Mech. 43(05), 646–657 (2022b). https://doi.org/10.19636/j.cnki.cjsm42-1250/o3.2022.021
Shi, Z.M., Shen, D.Y., Zhang, Q.Z., et al.: Experimental study on the coupled shear flow behavior of jointed rock samples. Eur. J. Environ. Civ. Eng. 22, s333–s350 (2018). https://doi.org/10.1080/19648189.2017.1390498
Sun, X.M., Miu, C.Y., Jiang, M., et al.: Experimental and theoretical study on creep behaviors of sandstone with different moisture contents based on modified Nishihara model. Chin. J. Rock Mech. Eng. 40(12), 2411–2420 (2021). https://doi.org/10.13722/j.cnki.jrme.2021.0302
Tang, C.S., Shi, B., Liu, C., et al.: Experimental characterization of shrinkage and desiccation cracking in thin clay layer. Appl. Clay Sci. 52(1–2), 69–77 (2011). https://doi.org/10.1016/j.clay.2011.01.032
Wang, Y.G.: The analyse and countermeasures study on the balance of coal market supply and demand in China. Shanxi University of Finance and Economics (2007)
Wang, J.G., Liang, B., Yang, P.J.: Creep experiment and nonlinear disturbance creep model of gneiss under dynamic and static load. J. China Coal Soc. 44(1), 192–198 (2019). https://doi.org/10.13225/j.cnki.Jccs.2018.5036
Wang, J.G., Sun, Q.G., Liang, B., et al.: Permeability evolution law of shale under cyclic loading and unloading of osmotic pressure. J. Vib. Shock 40(07), 253–259 (2021a). https://doi.org/10.13465/j.cnki.jvs.2021.07.034
Wang, X.K., Xia, C.C., Zhu, Z.M., et al.: Long-term creep law and constitutive model of extremely soft coal rock subjected to single-stage load. Rock Soil Mech. 42(08), 2078–2088+2098 (2021). https://doi.org/10.16285/j.rsm.2021.0178
Wang, J.G., Zhang, Q.X., Sun, Q.L., et al.: Macro-meso damage and fracture model for determining the creep characteristics of shale under osmotic pressuresure. J. Mater. Res. Technol. 17, 2084–2097 (2022). https://doi.org/10.1016/J.JMRT.2022.01.146
Xia, C.C., Yu, Q.F., Qian, X., et al.: Experimental study of shear-seepage behaviour of rock joints under constant normal stiffness. Rock Soil Mech. 41(01), 57–66+77 (2020). https://doi.org/10.16285/j.rsm.2018.2275
Xu, T., Zhou, G.L., Heap, M.J., et al.: The modeling of time-dependent deformation and fracturing of brittle rocks under varying confining and pore pressures. Rock Mech. Rock Eng. 51(10), 3241–3263 (2018). https://doi.org/10.1007/s00603-018-1491-4
Yang, C., Xu, X., Wang, L.H., et al.: Relationship between creep characteristics of intact rock and single-flawed sandstone under different critical stress intervals. Chin. J. Rock Mech. Eng. 41(07), 1347–1357 (2022). https://doi.org/10.13722/j.cnki.jrme.2021.0809
Zhang, L.L., Wang, X.J.: Study on composite creep model of rock considering viscoelastic plastic strain separation. J. Cent. South Univ., Sci. Technol. 52(5), 1655–1665 (2021). https://doi.org/10.11817/j.issn.1672-7207.2021.05.026
Zhang, Z., Fu, X., Sheng, Q., et al.: Effect of rainfall pattern and crack on the stability of a red bed slope: a case study in Yunnan Province. Adv. Civ. Eng. 2021(1), Article ID 6658211 (2021)
Zhang, S.L., Liang, W.G., Xiao, N., et al.: A fractional viscoelastic-plastic creep damage model for salt rock considering temperature effect. Chin. J. Rock Mech. Eng. 41(S2), 3198–3209 (2022). https://doi.org/10.13722/j.cnki.jrme.2021.1237
Zhao, Y., Wang, Y., Wang, W., et al.: Modeling of rheological fracture behavior of rock cracks subjected to hydraulic pressure and far field stresses. Theor. Appl. Fract. Mech. (2019). https://doi.org/10.1016/j.tafmec.2019.01.026
Zhao, L.Y., Lai, Y.M., Niu, F.J., et al.: Multi-scale damage creep model and long-term strength for hard brittle rocks. J. Cent. South Univ., Sci. Technol. 53(8), 3071–3080 (2022). https://doi.org/10.11817/j.issn.1672-7207.2022.08.024
Zhou, C., Yu, L., You, F., et al.: Coupled seepage and stress model and experiment verification for creep behavior of soft rock. Int. J. Geomech. 20(9), 04020146 (2020). https://doi.org/10.1061/(ASCE)GM.1943-5622.0001774
Zhou, R.H., Chen, Y., Cai, H.B., et al.: Creep characteristics and creep model of siltstone under triaxial compression and graded unloading. Chin. J. Rock Mech. Eng. 41(06), 1136–1147 (2022). https://doi.org/10.13722/j.cnki.jrme.2021.1116