Numerical analysis on nonlinear deformation behavior of rock considering compaction of pores

被引：0
|
作者：
Wang Q. [1 ]
Zhu W. [2 ]
Xu T. [2 ]
Liu H. [2 ]
Jia J. [3 ]
机构：
[1] Department of Resources and Environment, Heze University, Heze
[2] Center for Rock Instability and Seismicity Research, Northeastern University, Shenyang
[3] Heze Coal Administration Bureau, Heze
来源：
Wang, Qingyuan (wqyan_2006@163.com) | 2018年 / Chinese Academy of Sciences卷 / 48期
关键词：
Compaction factors; Nonlinearity; Numerical simulation; Porosity; Stress-strain relationship;
D O I：
10.1360/N092017-00122
中图分类号：
学科分类号：
摘要：
The nonlinear behavior of porous or fractured rocks plays an important role for analyzing the mechanical response and stability in many geological and geotechnical applications. A stress-strain relationship considering the porosity is established for modeling the nonlinear deformation. In the present paper, firstly, on the basis of nonlinear deformation mechanism of porous or fractured rocks, the typical stress-strain curve was divided into two parts factitiously. Then, two constitutive models were established for the two parts, respectively. In order to describe the effect of the change of porosity on deformation behavior of rock, a new microcracks closure factors Dϕ was proposed in the microcracks closure phase. For the other part, elastic damage mechanics is used to describe the constitutive law of meso-level elements, the maximum tensile strain criterion as well as the Mohr-Coulomb criterion is utilized as the damage threshold. The proposed model is implemented using finite element method by MATLAB programming under the environment of COMSOL Multiphysics. Then the model was validated by comparing the numerical simulations with our experimental result and the previously published experimental data. At last, numerical simulation on failure process of 6 rock specimens with different porosities but same rock matrix under uniaxial compression is presented. It is found that the established model accurately reproduces the typical stress-strain curve, the microcracks closure phase, especially. With the increase of porosity, the uniaxial compressive strength (UCS) decreases. And the elasticity modulus increases with the porosity decrease. © 2018, Science Press. All right reserved.
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页码：565 / 574
页数：9
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共 20 条
  • [11] Liu H.H., Rutqvist J., Berryman J.G., On the relationship between stress and elastic strain for porous and fractured rock, Int J Rock Mech Min Sci, 46, pp. 289-296, (2009)
  • [12] Zhao Y., Liu H.H., An elastic stress-strain relationship for porous rock under anisotropic stress conditions, Rock Mech Rock Eng, 45, pp. 389-399, (2012)
  • [13] Corkum A.G., Martin C.D., The mechanical behaviour of weak mudstone (Opalinus Clay) at low stresses, Int J Rock Mech Min Sci, 44, pp. 196-209, (2007)
  • [14] Tang C., Numerical simulation of progressive rock failure and associated seismicity, Int J Rock Mech Min Sci, 34, pp. 249-261, (1997)
  • [15] Zhu W.C., Tang C.A., Micromechanical model for simulating the fracture process of rock, Rock Mech Rock Eng, 37, pp. 25-56, (2004)
  • [16] Rutqvist J., Tsang C.F., A study of caprock hydromechanical changes associated with CO<sub>2</sub>-injection into a brine formation, Environ Geol, 42, pp. 296-305, (2002)
  • [17] Wang Q.Y., Zhu W.C., Xu T., Et al., Numerical simulation of rock creep behavior with a damage-based constitutive law, Int J Geomech, 17, (2017)
  • [18] Xu T., Tang C., Zhao J., Et al., Modelling the time-dependent rheological behaviour of heterogeneous brittle rocks, Geophys J Int, 189, pp. 1781-1796, (2012)
  • [19] Heap M.J., Xu T., Chen C., The influence of porosity and vesicle size on the brittle strength of volcanic rocks and magma, Bull Volcanol, 76, (2014)
  • [20] Zhu W., Baud P., Wong T.F., Micromechanics of cataclastic pore collapse in limestone, J Geophys Res, 115, (2010)
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