ZHAI Y F, SONG Z Y, TIAN Z F,et al．Study on influencing factors of dynamic response of underground structures based on viscoelastic-plastic model[J].Journal of Henan Polytechnic University( Natural Science)，doi:10.16186/j.cnki.1673-9787.2024010018.

doi:10.16186/j.cnki.1673-9787.2024010018

Received：2024-01-04

Revised：2024-03-21

Online：2024-04-19

Study on influencing factors of dynamic response of underground structures based on viscoelastic-plastic model(Online)

ZHAI Yafei^1,2,SONG Zhiyu^1,2,TIAN Zhifeng^1,2,3,JIN Junchao^1,2,LIU Guangkun^1,2

(1.Yellow River Engineering Consulting Co., Ltd., Zhengzhou 450003; 2.Key Laboratory of Water Management and Water Security for Yellow river Basin of Ministry of Water resources ( under construction)，Zhengzhou 450003；3.Dalian University of Technology, State Key Laboratory of Coastal and Offshore Engineering, Dalian 116024)

Abstract: Objectives Under strong seismic actions, soil often exhibits strong nonlinear dynamic characteristics, leading to exacerbated damage to structures within the soil. To explore methods for incorporating the nonlinear behavior of layered soil into seismic inputs and the influencing factors on the dynamic response of underground structures. Methods In terms of seismic input, building upon previous research findings, a method has been proposed that can effectively simulate layered soil seismic input, achieving iterative updates of material parameters at various depths within the soil. This method can reflect the spatial distribution characteristics of actual soil parameters. In the dynamic analysis of soil-structure interaction, the soil equivalent linear model is nested within the Mohr-Coulomb model to establish a viscoelastic-plastic model. This provides a seismic response analysis procedure for a layered soil-structure system considering the nonlinear properties of the soil. Using a specific engineering project as an example, nonlinear seismic response analysis of the soil-structure system is conducted to study the influence of burial depth and soil parameters on the seismic performance of underground structures. Results The results indicate that under static and dynamic loads, as the burial depth of the structure increases, the relative displacement difference between the top and bottom of the structure gradually decreases. Under the same burial depth conditions, seismic actions induce a greater proportion of dynamic bending moment compared to shear force responses. Additionally, maintaining the same ground acceleration time history, the internal force response of the structure gradually decreases with the increase of soil shear modulus. Conclusions In general, seismic forces result in notable shear and bending moment responses in the upper layer columns of double-layered underground structures, necessitating careful consideration in structural seismic design. Additionally, when designing underground structures in soft soil environments, it's crucial to focus on the dynamic bending moment responses of the structures and implement effective reinforcement measures.

Key words: layered foundation; seismic input; non linear; underground structure; burial depth; soil parameters