In the design and construction of rock engineering, mechanical calculation is an important way to understand the properties of rock mass. In the rheological simulation of rockmass, mechanical parameters of constitutive model of rock mass become key factor to the accuracy of the calculation results. In this paper, on the basis of previous researches, sensitivity analysis of the mechanical parameters of viscoplastic rheological model is conducted. The parameter identification result under three confining pressures is regarded as the reference value, and each parameter of these reference values is increased by 20％, 40%, and decreased by 20％, 40% respectively. The other parameters remain unchanged. The strain value can be calculated by deduced rheological constitutive model and then the difference between calculated strain value and test strain value is obtained. According to the difference, the relative change of total error can be obtained and is used to measure the trend and degree of the deviation between calculated strain value and test strain value caused by parameter alteration. Among the 6 parameters in the sensitivity analysis, the sensitivity of E is the highest, the sensitivities of m and β are high in different regions, followed by γ,n, and g. Through the sensitivity analysis, the importance of mechanical parameters to the accuracy of calculation results are verified.
Key words
viscoplastic rheological model /
mechanical parameters /
sensitivity analysis /
deformation modulus /
strain error
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References
[1] 黄书岭, 冯夏庭, 张传庆. 岩体力学参数的敏感性综合评价分析方法研究[J].岩石力学与工程学报, 2008, 27(增1): 2624-2630. (HUANG Shu-ling, FENG Xia-ting, ZHANG Chuan-qing. Study of Method of Comprehensive Evaluation for Parameters of Constitutive Model of Rock Mass[J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(Sup.1): 2624-2630.(in Chinese))
[2] 黄高峰,李宗利,牟声远.Hoek-Brown准则参数在边坡工程中的敏感性分析[J].岩土力学,2009,30(7):2163-2167. (HUANG Gao-feng, LI Zong-li, MOU Sheng-yuan. Sensitivity Analysis of Hoek-Brown Failure Criterion Parameters on Slope Projects[J]. Rock and Soil Mechanics, 2009,30(7): 2163-2167.(in Chinese))
[3] 杨玉生,刘小生,赵剑明,等.邓肯E-B模型参数敏感性分析 [J].中国水利水电科学研究院学报,2013,11(2):81-86. (YANG Yu-sheng, LIU Xiao-sheng, ZHAO Jian-ming, et al. Parameter Sensitivity Analysis of Duncan E-B Model[J]. Journal of China Institute of Water Resources and Hydropower Research, 2013, 11(2): 81-86.(in Chinese))
[4] 李良权,徐卫亚,王 伟.基于西原模型的非线性黏弹塑性流变模型[J].力学学报,2009,41(5):671-680. (LI Liang-quan, XU Wei-ya, WANG Wei. A Nonlinear Viscoelastoplastic Rheological Model Based on Nishihara's Model[J]. Chinese Journal of Theoretical and Applied Mechanics, 2009,41(5):671-680. (in Chinese))
[5] 郑仲寿,潘学渊,于万涛.基于正交试验方法的双屈服面弹塑性模型参数敏感性分析[J].红水河,2012,31(2):42-47. (ZHENG Zhong-shou, PAN Xue-yuan, YU Wan-tao. Analysis on Parameter Sensitivity of Double Yield Surface Elastoplastic Model Based on Orthogonal Test Method[J]. Hongshui River, 2012,31(2):42-47. (in Chinese))
[6] 董海洲,罗日洪,张 令.岩石单裂隙渗流-传热模型及其参数敏感性分析[J].河海大学学报(自然科学版),2013,41(1):42-47. (DONG Hai-zhou, LUO Ri-hong, ZHANG Ling. Seepage and Heat Transfer Model of a Single Fracture of Rock and Relevant Parameter Sensitivity Analysis[J]. Journal of Hohai University (Natural Science), 2013, 41(1): 42-47. (in Chinese))
[7] 任 磊. Duncan-Chang模型参数及抗剪强度参数优化研究-以红土为例[D].昆明:昆明理工大学, 2008. (REN Lei. Optimization of Duncan-Chang Model Parameters and Shear Strength Parameters[D].Kunming: Kunming University of Science and Technology, 2008. (in Chinese))
[8] 周先齐. 大型地下洞室围岩流变力学特性与长期稳定性研究[D]. 南京:河海大学, 2009. (ZHOU Xian-qi. Rheologic Mechanics Characteristics and Long-term Stability of Surrounding Rock in Large Underground Cavern[D]. Nanjing: Hohai University, 2009. (in Chinese))
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