scholarly journals Research on the Gas Tunnel Ventilation

2016 ◽  
Vol 5 (1) ◽  
pp. 34
Author(s):  
Min Yang
Keyword(s):  
High Speed ◽  
Ventilation System ◽  
Tunnel Construction ◽  
Construction Process ◽  
High Speed Railway ◽  
Tunnel Ventilation ◽  
Important Measure

<p class="p1"><span class="s1">Along with the development of high speed railway, the ratio of high gas tunnel in construction process becomes more and more. Meanwhile, ventilation is an important measure to make sure security of gas tunnel construction, it is a key problem that whether the ventilation system is perfect or not. Through the research of actual gas tunnel, not only to meet the demands of construction, but also to save cost, therefore, it is key point of modern gas tunnel construction. </span></p>

scholarly journals Research on the Gas Tunnel Ventilation

2016 ◽  
Vol 5 (1) ◽  
pp. 34
Author(s):  
Min Yang
Keyword(s):  
High Speed ◽  
Ventilation System ◽  
Tunnel Construction ◽  
Construction Process ◽  
High Speed Railway ◽  
Tunnel Ventilation ◽  
Important Measure

<p class="p1"><span class="s1">Along with the development of high speed railway, the ratio of high gas tunnel in construction process becomes more and more. Meanwhile, ventilation is an important measure to make sure security of gas tunnel construction, it is a key problem that whether the ventilation system is perfect or not. Through the research of actual gas tunnel, not only to meet the demands of construction, but also to save cost, therefore, it is key point of modern gas tunnel construction. </span></p>

Study on Construction Risk Assessment Method of Deep Buried Tunnels

2013 ◽  
Vol 405-408 ◽  
pp. 1305-1308
Author(s):  
Xing Kuang ◽  
Di Qing Yi ◽  
Cheng Liang Wang
Keyword(s):  
Risk Assessment ◽  
High Speed ◽  
Assessment Method ◽  
Risk Identification ◽  
Tunnel Construction ◽  
Construction Process ◽  
Railway Tunnel ◽  
High Speed Railway ◽  
Risk Assessment Method ◽  
Construction Risk

High speed railway tunnel have many uncertainty hazard factors in construction, at the stage of construction drawing design and during tunnel construction process. Taking no.1 tunnel in Xuefeng Mountain as a deep buried tunnel in the paper, tunnel construction risk source and main risk identification are analysis, main risk assessment during construction is recognized and reference for other similar projects is provided.

scholarly journals New technologies for high-risk tunnel construction in Guiyang-Guangzhou high-speed railway

2013 ◽  
Vol 21 (4) ◽  
pp. 258-265 ◽  
Author(s):  
Yubao Zhao ◽  
Shougen Chen ◽  
Xinrong Tan ◽  
Ma Hui
Keyword(s):  
High Risk ◽  
High Speed ◽  
New Technologies ◽  
Tunnel Construction ◽  
High Speed Railway

Characteristics of Settlement and Assessment Methods of Engineered Structures under Certain High-Speed Railway Tracks in China

2012 ◽  
Vol 446-449 ◽  
pp. 1869-1879
Author(s):  
Shi Guo Xiao ◽  
Qing Rong Yan ◽  
Wen Chen
Keyword(s):  
High Speed ◽  
Construction Process ◽  
Small Magnitude ◽  
High Speed Railway ◽  
Railway Line ◽  
Railway Tracks ◽  
Analysis Methods ◽  
Predictive Methods ◽  
Engineered Structures ◽  
Line Construction

The assessment of settlement deformation of engineered structures under high-speed railway tracks is an important control link in high-speed railway line construction. This paper discusses characteristics of settlement deformation of sections of subgrade, bridges and tunnels, and analyzes the suitability of predictive methods in currently available technical codes and standards based on measured data of settlement deformation. Currently available assessment analysis methods have good applicability for subgrade sections but are not suitable for sections of bridges and tunnels. Suitable assessment analysis methods are proposed and have been successfully applied to settlement deformation of engineered structures under the tracks of high-speed railway lines. The methods suit the characteristics of “small magnitude and large fluctuation” changes of measured settlement deformations taking account of the construction process of the engineered project.

scholarly journals Research on Air Infiltration Characteristics of High-speed Railway Station

2021 ◽  
Vol 261 ◽  
pp. 03041
Author(s):  
Qian Bin ◽  
Sun Liangliang ◽  
Yu Tao ◽  
Lei Bo ◽  
Bi Haiquan
Keyword(s):  
Mechanical Ventilation ◽  
High Speed ◽  
Thermal Environment ◽  
Dominant Role ◽  
Ventilation System ◽  
Large Space ◽  
Railway Station ◽  
High Speed Railway ◽  
Air Infiltration ◽  
Air Volume

High-speed railway station has a large space and a large amount of air infiltration, which has great influences on the thermal load, the thermal environment and the air quality. In this paper, the air infiltration and its distribution characteristics in winter and summer in different climatic zones are determined by CO2 concentration method. The results showed that buoyancy-driven pressure played a dominant role, and the infiltration air volume of 2.8 h-1 in winter is larger than that of 2.0 h-1 in summer. The infiltration air volume in the hot summer and cold winter zone and the hot summer and warm winter zone is larger than that in the cold zone. When the mechanical ventilation system for fresh air is turned off, the indoor CO2 concentration meets the human safety threshold. But it can be found that when the air infiltration volume is small enough to a certain extent, the air infiltration volume has a poor dilutive effect on pollutants in the deeper parts of the station. The tradeoff between the utilization of air infiltration and the elimination of mechanical ventilation needs to be furthered considered.

scholarly journals Research on Settlement and Deformation Control of Newly-built High-speed Railway and Existing Line Foundation under Different Overlap and Filling Types

2021 ◽  
Vol 233 ◽  
pp. 03009
Author(s):  
Wen-yi Li ◽  
Chao-qi Jin ◽  
Jun-hua Zhu ◽  
Hao-sen Guo ◽  
Wen-jun Luo ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
High Speed ◽  
Loading Capacity ◽  
Construction Process ◽  
Element Analysis ◽  
High Speed Railway ◽  
Deformation Control ◽  
The Finite Element Analysis ◽  
Analysis Platform ◽  
The Impact

Subgrade filling of high-speed railway will cause additional settlement and deformation of existing lines.In this paper,using the finite element analysis platform (Taxis 2D) and considering the settlement of the existing line itself, This paper analyzes the impact of the new and old subgrade lap type and the layer filled this lesson of the new subgrade on the implementation of the existing subgrade. The results illustrate the following points:(1) Compared with different overlapping surface types, different filling those points have a greater impact on the settlement of the existing line; (2) The height of the steps is 0.6m and the width is 1.0m.In the subsequent layered filling construction process, each level The loading capacity of 30cm is more reasonable, which can effectively control the influence of the existing line on the additional settlement of the existing railway. The research results can provide a reference for the optimization of similar roadbed width construction.

scholarly journals Engineering geological studies for empirical design of tunnel 7 of Jakarta - Bandung high-speed railway, Indonesia

2021 ◽  
Vol 325 ◽  
pp. 01007
Author(s):  
Riski Pramono ◽  
I Gde Budi Indrawan ◽  
Maulidya Indah Junica
Keyword(s):  
Rock Mass ◽  
Support System ◽  
High Speed ◽  
Sedimentary Rocks ◽  
Rock Mass Classification ◽  
Tunnel Construction ◽  
High Speed Railway ◽  
Tunnel Support ◽  
Mass Classification ◽  
Empirical Design

The empirical design of tunnel 7 of the Jakarta-Bandung high-speed railway was based on the Basic Quality (BQ) system, which was the Chinese standard of rock mass classification. Due to the high uncertainty of a rock mass classification, comparative studies of rock mass quality and tunnel support systems based on other rock mass classifications are commonly required. The main objective of this research was to assess the rock mass quality and excavatability at the tunnel construction site and propose the tunnel support system based on three widely used methods, namely GSI, RMR, and Q-system. This study involved geological mapping, determination of surface and subsurface rock weathering, rock mass classification of drilling cores, and laboratory testing. The results show that the tunnel construction area consists of highly weathered volcanic and sedimentary rocks. The tunnel elevation consists of poor and extremely to very poor rock masses of sedimentary rocks. Hard digging is the optimum rock mass excavation method to use. Applications of rock bolt, wire mesh, and shotcrete are proposed for the tunnel support system.

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