scholarly journals A Numerical Method for the Design of the U-Shaped Segmental Tunnel Lining under the Impact of Earthquakes: A Case Study of a Tunnel in the Hanoi Metro System

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Chi Thanh NGUYEN ◽  
Ngoc Anh DO ◽  
Van Vi PHAM ◽  
Alexandr GOSPODARIKOV
Keyword(s):  
Bending Moment ◽  
Tunnel Lining ◽  
Fault System ◽  
Underground Structures ◽  
Normal Forces ◽  
Big City ◽  
Red River Fault ◽  
The Impact ◽  
Metro System

Circular tunnels are usually encountered when excavation tunnel. However, the U-shapedtunnel lining is used a lot in practice because of it’s advantages. However, there are not many studies inthe world to calculate and design for underground structures with U-shaped tunnel lining, especially inthe case of tunnels being affected by earthquakes. This paper proposes a new numerical-HRM methodapproach for the analysis of U-shaped segmental tunnel lining under the impact of earthquakes. Hanoi isthe capital of Vietnam, this is a big city with more than 8 million people. Hanoi is located between twomajor fault systems, the Red River fault system and the Son La-Dien Bien-Lai Chau fault system.Therefore, the Hanoi area is assessed as likely to be affected by earthquakes of magnitude Mw = 6.1 up to6.5 Richter. The Hanoi metro system is constructed by TBM and the U-shaped segmental tunnel lining isalso one of the types of tunnel lining considered for use in the construction of metro tunnels in Hanoi. Theimproved HRM method has been used to investigate the effect of joints in the tunnel lining from the Hanoisystem metro under the impact of earthquakes is conducted considering from the results of the tunnellining behavior in terms of bending moment (M), normal forces (N) and tunnel lining displacements (δn)in both cases: the U-shaped continuous tunnel lining and the U-shaped segmental tunnel lining.

scholarly journals Examining the impact of lahars on buildings using numerical modelling

2017 ◽  
Vol 17 (5) ◽  
pp. 703-719 ◽  
Author(s):  
Stuart R. Mead ◽  
Christina Magill ◽  
Vincent Lemiale ◽  
Jean-Claude Thouret ◽  
Mahesh Prakash
Keyword(s):  
Numerical Modelling ◽  
Critical Infrastructure ◽  
Human Life ◽  
Bending Moment ◽  
Building Damage ◽  
Minor Role ◽  
Building Vulnerability ◽  
Inundation Area ◽  
The Impact

Abstract. Lahars are volcanic flows containing a mixture of fluid and sediment which have the potential to cause significant damage to buildings, critical infrastructure and human life. The extent of this damage is controlled by properties of the lahar, location of elements at risk and susceptibility of these elements to the lahar. Here we focus on understanding lahar-induced building damage. Quantification of building damage can be difficult due to the complexity of lahar behaviour (hazard), varying number and type of buildings exposed to the lahar (exposure) and the uncertain susceptibility of buildings to lahar impacts (vulnerability). In this paper, we quantify and examine the importance of lahar hazard, exposure and vulnerability in determining building damage with reference to a case study in the city of Arequipa, Peru. Numerical modelling is used to investigate lahar properties that are important in determining the inundation area and forces applied to buildings. Building vulnerability is quantified through the development of critical depth–pressure curves based on the ultimate bending moment of masonry structures. In the case study area, results suggest that building strength plays a minor role in determining overall building losses in comparison to the effects of building exposure and hydraulic characteristics of the lahar.

The impact of digitalization on business processes: case study: Kosovo SMEs

2018 ◽  
Author(s):  
Ylber Limani ◽  
Edmond Hajrizi ◽  
Rina Sadriu
Keyword(s):  
Business Processes ◽  
The Impact
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