Inversion Study on Dynamic Parameters of Moderately Weathered Dolomite

DOI: https://doi.org/10.62517/jcte.202606104

Author(s)

Yang Qiao

Affiliation(s)

Kunming Branch of China Municipal Engineering Central South design and Research Institute Co., Ltd., Kunming, Yunnan, China

Abstract

This paper conducts an inversion study on the dynamic elastic modulus and dynamic Poisson's ratio of moderately weathered dolomite using MIDAS/GTS-NX finite element software, with a real estate project in Kunming as the engineering background. Taking the maximum and minimum principal stresses at observation points of tunnel lining as evaluation indicators, the rationality of simplifying the rock's constitutive relation to an elastic one is verified first. The results show that the average relative errors of the maximum and minimum principal stresses under the elastic constitutive relation are 2.9% and 3.0% respectively compared with the Mohr-Coulomb model, indicating good reliability. Through time-history analysis and parameter adjustment, it is concluded that when the dynamic elastic modulus of moderately weathered dolomite is 1-1.15 times the static elastic modulus (19000 MPa) and the dynamic Poisson's ratio is 1-1.24 times the static Poisson's ratio (0.28), the dynamic calculation results are consistent with the actual stress characteristics of the tunnel lining. This study provides a scientific reference for the selection of dynamic parameters of moderately weathered dolomite in seismic design and numerical simulation of underground structures.

Keywords

Dolomite; Dynamic Elastic Modulus; Dynamic Poisson's Ratio; Seismic Design; Time History Analysis

References

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