

In the number 5800, the least significant figure is '8'. If no decimal point is present, the rightmost non-zero digit is the least significant figure.In the number 43.120 (which may be written as 4.3210 x 10 1), the '0' is the least significant figure. The FLAC3D model was used to assess the impact of the changing pore pressure field on the distribution of stress in and above the storage pool. Least significant figures are still significant! In the number 0.004205 (which may be written as 4.205 x 10 -3), the '5' is the least significant figure. The TOUGH2 model was used to test and develop a two-phase flow model of the system, generating pore pressures for input into the FLAC3D model. Another way to look at the least significant figure is to consider it to be the rightmost digit when the number is written in scientific notation.



This study shows that the simulated results using the proposed new constitutive model matched much more closely with the measured field data, with an average error less than 5%. The obtained results of these models were analyzed and compared with field data. The excavation-induced stress in rocks was calculated by FLAC 3D using the Mohr-Coulomb model, conventional strain model, and the proposed modified model. This study analyzes and discusses various attenuation parameters in the proposed nonlinear plastic constitutive model using FLAC 3D software. In order to better reflect the nonlinear stress-strain behavior of rock, especially for the post-peak failure behavior, with expected stiffness degradation and large deformation, a modified constitutive model of rock considering stiffness degradation and dilatation behavior at large deformation was proposed in this study. The existing constitutive models of rock with strain softening cannot successfully reflect the damage-induced anisotropy and nonlinearity of the post-peak failure behavior under progressive loading.
