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The impact of COVID-19 pandemic on logistics firms in Vietnam

100%

Do M. N. , Dung N. T. , Tuan T. T.

Annals of Computer Science and Information Systems

2021

tom Vol. 28

99--103

The paper examines the impact of Coronavirus epidemic on logistics companies in Vietnam and firm responses. Results show that most firms are negatively affected by the pandemic, micro and small businesses are hit the hardest. Coping strategies of firms often involve COVID-prevention practices as required by the government with little investment on technological application and human resource development. Analysis concludes that Vietnamese logistics companies are not well-prepared for crises, especially firms of small sizes which partly show resistance to new digitalizing practices despite the current circumstances brought on by the pandemic.

Buttress wall in limiting wall deformation caused by deep excavation: A case study for colluvial soil in Vietnam

88%

Bui L. M. , Wu L. , Do M. N. , Cheng Y. , Dong D. J.

2024

tom Vol. 70, nr 2

477--492

The objective of this study is to assess the impact of utilizing a BW (Buttress wall) to control the deflection of a diaphragm wall in colluvial soil conditions in Vietnam. The physical and mechanical properties of the colluvial layers are evaluated using data closely monitored during a specific project, serving as validation for 3D numerical simulations utilizing the Hardening Soil Model. The analysis results closely match the field monitoring data, which has tested the accuracy of the simulation model. This forms the basis for further investigations into the dimensional parameters of BW walls, including length, thickness, and spacing between them. The results obtained from the parametric study demonstrate that altering the wall length and spacing between BWvwalls significantly limits the deflection of the diaphragm wall, while changes in thickness have a negligible effect. Through the 3D numerical simulations, a linear relationship between the maximum wall deflection and parameters such as wall length and spacing between BW walls has been established.