Constitutive model of claystone based on plastic damage and its numerical implementation

被引：0
|
作者：
Li F. [1 ,2 ]
Chen W. [1 ]
Yu H. [1 ,2 ]
Ma Y. [1 ,2 ]
Lei J. [1 ,2 ]
机构：
[1] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan
[2] University of Chinese Academy of Science, Beijing
来源：
Chen, Weizhong (wzchen@whrsm.ac.cn) | 1600年 / China Coal Society卷 / 45期
关键词：
Claystone; Constitutive model; Drucker-Prager criterion; Integration algorithm; UMAT;
D O I：
10.13225/j.cnki.jccs.2019.0167
中图分类号：
学科分类号：
摘要：
Claystone is a common geotechnical medium in deep underground engineering project.In order to ensure the safety of tunnel during its excavation, the work which is related to its mechanical properties is required to be studied.The existing test results show that the claystone exhibits some obvious strain-hardening, strain-softening and plastic flow characteristics during the triaxial compression test.At the same time, it is found that the samples produce some obvious defects during the loading process, and the existence of these defects would weaken the mechanical properties.In order to establish a model which can describe the mechanical phenomena of claystone, the micro-crack is used as the damage element to construct a reasonable plastic damage variable.The damage variable is introduced into the modified Drucker-Prager cap model together with the plastic hardening variable to construct a new constitutive model.The model is numerically implemented by the ABAQUS platform and its UMAT subroutine.In the subroutine, the plastic hardening and damage variables are introduced into the iterative calculation based on the backward Euler constitutive integral algorithm, so that the yield surface is updated with the stress in the iterative process until the stress returns to the yield surface (The size of the yield surface changes with the plastic damage and hardening variable).This model is used to simulate the triaxial compression test of claystone under normal temperature, and the simulation results are compared with the experimental results.The comparison results show that the simulation results are in good agreement with the experimental results, indicating that the constitutive model established in this paper can better reflect the mechanical properties of claystone.Finally, the plane excavation model of claystone tunnel is established.The new model is used to simulate the excavation process.The evolution of damage variables, stress and pore water pressure during the whole simulation process is analyzed.The simulation results verify the applicability of the new model in numerical simulation of underground tunnel excavation. © 2020, Editorial Office of Journal of China Coal Society. All right reserved.
引用
收藏
页码：633 / 642
页数：9
相关论文
共 32 条
  • [1] Yu H., Hydro-mechanical coupled creep behavior of Boom clay, (2010)
  • [2] Kang H., Support technologies for deep and complex roadways in underground coal mines: A review, International Journal of Coal Science & Technology, 1, 3, pp. 261-277, (2014)
  • [3] Li X.L., Thermal impact on the damaged zone around a radioactive waste disposal in clay host rocks, Deliverable 2.State of The Art on THMC
  • [4] Chen X., Yang Q., Zhou W., An elastoplastic damage model for geomaterials and analysis of strain localizaion of arch dams, Rock and Soil Mechanics, 28, 5, pp. 865-870, (2007)
  • [5] Wei L., Yang C., Constitutive model and seepage model of anisotropic rock in compression with micromechanics(I): Theoretical models, Rock and Soil Mechanics, 27, 3, pp. 429-434, (2006)
  • [6] Xie H., Peng R., Ju Y., Energy dissipation of rock deformation and fracture, Chinese Journal of Rock Mechanics and Engineering, 23, 21, pp. 3565-3570, (2004)
  • [7] Shao J.F., Rudnicki J.W., A microcrack-based continuous damage model for brittle geomaterials, Mechanics of Materials, 32, 10, pp. 607-619, (2000)
  • [8] Wang Z., Li Y., Wang J.G., A damage-softening statistical constitutive model considering rock residual strength, Computers & Geosciences, 33, 1, pp. 1-9, (2007)
  • [9] Wang J., Jiang A., An elastoplastic damage constitutive model of rock and its application to tunnel engineering, Rock and Soil Mechanics, 36, 4, pp. 1147-1158, (2015)
  • [10] Yuan X., Liu H., Wang Z., Study of elastoplastic damage constitutive model of rocks based on Drucker-Prager criterion, Rock and Soil Mechanics, 33, 4, pp. 1104-1108, (2012)
1234