Secondary development and application of the NP-T creep model based on FLAC3D

作者：Chen, Luwang; Li, Shengjie^*; Zhang, Kaixian; Liu, Yanxian

来源：Arabian Journal of Geosciences, 2017, 10(23): 508.

DOI：10.1007/s12517-017-3301-9

• Damage effect
• NP-Tcreep model
• Secondary development
• Parameter inversion
• FLAC(3D)

The Poynting-Thomson creep model is one of the classical combined creep models; however, it fails to demonstrate the plastic creep and the accelerated creep stage, which limit the popularization and the use of the model. The New Poynting-Thomson (NPT) creep model is established to enhance the existing Poynting-Thomson creep model by the damage theory and the viscoplastic unit in this paper. On the basis of deducing its constitutive equation in three-dimensional finite difference form, The NP-T creep model is secondarily developed by using Visual C++ language and FLAC(3D) built-in FISH language. The results of a parameter inversion indicate the superiority of the NP-T creep model that can be applied in non-uniform stress field. After validating its accuracy by the FLAC(3D) software, the NP-T creep model is used in a numerical simulation to reflect that the roadway stability is gradually weakened with the increase of the surrounding soft rock thickness.

• 出版日期2017-12
• 单位合肥工业大学