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Modeling of ground vibrations from a tunnel in layered unsaturated soil with spatial variability

Di Honggui, Yu Jiayong, Guo Huiji, Zhou Shunhua, He Chao, Zhang Xiaohui

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 1

art. no. e33, 2022

This paper presents a method for modeling the ground vibrations from a railway tunnel in layered unsaturated soil, considering the uncertainty and spatial variability of soil parameters. A deterministic ground vibration prediction model, which is an improved Euler beam model, is developed to evaluate the vibrations for a tunnel in layered unsaturated soil. Furthermore, the spatial variability of soil parameters is simulated by random fields using the Monte Carlo theory and the middle point method of Cholesky decomposition. By coupling the random fields of soil parameters to the deterministic vibration prediction model, the effect of uncertainty and spatial variability of soil on the ground vibrations is demonstrated through a case study. It is found that the variability of soil parameters has little influence on the spatial distribution regularities of ground vibrations, but it has a significant effect on the dynamic response amplitude and the critical velocity of the system.

Performance evaluation model and algorithm of green supply chain management based on sustainable computing

He Chao

Ecological Chemistry and Engineering. S

2021

Vol. 28, nr 4

499--512

How to facilitate collaborative development between the enterprise and the environment under the dual constraints of resources and the environment is the focus of today's green supply chain management system research. Through the performance evaluation of the green supply chain, we can understand the operation of the whole supply chain and its shortcomings, provide a basis for improving related processes, and have important practical significance for improving the competitiveness and protection of its products. First of all, by summarising and analysing the research status of sustainable supply chain management in different countries, the research idea and overall background of this paper are proposed. It discusses the theory of sustainable supply chain management and the performance evaluation system and calculation types of sustainable supply chain management. Finally, the relative weight of each index is determined based on the sustainability calculation method, and then the decentralisation degree of the index is constructed. During this period, the fuzzy comprehensive evaluation method is used to evaluate the performance of sustainable supply chain, conduct case analysis and summary, and evaluate the performance of green supply chain component in economic, social, environmental and other aspects. In this paper, representative companies are selected as examples to evaluate their green supply chain management performance, and the evaluation algorithm is studied based on sustainable calculation method. The results show that a reasonable and effective evaluation of the enterprise performance of green supply chain management and a sustainable algorithm study can effectively identify potential problems in the operation of the company and improve the overall operation of the company at this stage.