Detection and Safety Evaluation on Cavity in Tunnel Lining

2013 ◽  
Vol 438-439 ◽  
pp. 983-986
Author(s):  
Ze Pei Xu ◽  
Xi Bing Li
Keyword(s):  
Concrete Structure ◽  
Safety Evaluation ◽  
Reference Method ◽  
Tunnel Lining ◽  
Construction Technology ◽  
Tunnel Structure ◽  
Tunnel Engineering ◽  
Composite Lining

Due to the construction technology and concrete structure of tunnel, cavity can be engendered in the composite lining. To evaluate the influence of the cavity on tunnel lining, cavity must be first detected, and safety evaluation of tunnel structure can be taken with the detection results. With the tunnel engineering example, a typical section chosen has been checked, and the safety of cavity was evaluated. It can provide a reference method for the detection and safety evaluation on cavity in tunnel lining.

scholarly journals Analysis of Detection and Treatment Schemes of Highway Tunnel Lining Cracks

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Yike Wei ◽  
Lingfeng Yu
Keyword(s):  
Daily Life ◽  
Tunnel Lining ◽  
Detection Methods ◽  
Tunnel Engineering ◽  
Highway Tunnel ◽  
People’S Daily ◽  
People's Daily

Highway tunnels play a very important role in people's daily life. Among them, lining is an essential part of tunnel engineering, and the quality of lining greatly affects the overall quality of the tunnel. On this basis, the causes of lining cracks and the detection methods of existing highway tunnel lining cracks are analyzed, and the treatment countermeasures for highway tunnel lining cracks are proposed.

The Seismic Damage Characteristic and Mechanism Analysis of Building Structure in Wenchuan Earthquake

2011 ◽  
Vol 287-290 ◽  
pp. 1892-1895
Author(s):  
Yu Wang ◽  
Yong Yao ◽  
Bin Cheng ◽  
Lin Wang
Keyword(s):  
Concrete Structure ◽  
Resistance Mechanism ◽  
Structure Type ◽  
Seismic Damage ◽  
Construction Technology ◽  
Mechanism Analysis ◽  
Damage Degree ◽  
Feature Structure ◽  
Frame Construction ◽  
Damage Characteristic

In the paper, the seismic damage information of six kinds of buildings, including Brick and concrete structure, the bottom frame brick and concrete structure, frame construction, Big span structure, special structure, farmhouse, were collected. Based on the architecture type, damage degree, height of house, the seismic damage information were statistic analysis in the damage characteristic of the structure. And on the basis of the damage characteristic, the dynamic response and earthquake resistance mechanism were studied. The correlation among site feature, structure type, strength of materials, construction technology and the seismic damage of structure were discussed.

Comparative Analysis of the Influence of Different Construction Technology for Excavation on Adjacent Tunnels

2014 ◽  
Vol 638-640 ◽  
pp. 884-887
Author(s):  
Yong Gang Du ◽  
Jing Cao ◽  
Zu De Ding
Keyword(s):  
Lateral Displacement ◽  
Internal Force ◽  
Calculation Model ◽  
Construction Technology ◽  
Tunnel Structure ◽  
Lateral Deformation ◽  
Foundation Pit ◽  
Engineering Construction ◽  
Excavation Process ◽  
Calculation Results

Based on the project of a foundation pit engineering adjacent to existing tunnel of Kunming metro line 1, a 3D calculation model is established in consideration the interaction of foundation pit support structures, tunnel structure and soil. In this paper, the authors have simulated the foundation pit excavation process in three conditions, and analyzed the changing laws of the lateral displacement and internal force of the tunnel induced by adjacent excavation under different conditions. Calculation results show that the distributions and the values of the displacement and internal force of the tunnel are obviously different under three different construction technologies, and the “jump dig” is the optimum excavation scheme due to the restriction in the excavation of foundation pit, and the lateral deformation of tunnel structure is smallest in this condition. The conclusion can provide a theoretical basis for similar excavation engineering construction.

Application of Carbon Fiber Cloth in Reinforcement of Metro Tunnel Disease

2013 ◽  
Vol 353-356 ◽  
pp. 1525-1528 ◽  
Author(s):  
Yu Jie Li ◽  
Hui Jie Xu ◽  
Yuan Zhang ◽  
Juan Juan Yao
Keyword(s):  
Carbon Fiber ◽  
Nondestructive Test ◽  
Tunnel Lining ◽  
Construction Technology ◽  
Mining Method ◽  
Carbon Fiber Cloth ◽  
Lining Structure ◽  
Structure Strength ◽  
Metro Tunnel ◽  
Reinforcement Measures

It is study about crack diseases on tunnel lining of BEI JING metro, which is build by mining method. To begin with, the design information, the neighboring environment and the base characteristic of the tunnel is investigated. Meanwhile, the nondestructive test is working on the tunnel lining. On the basis of understanding all the disease forms, the reinforcing measure on tunnel lining is specifically formulated. This article mainly introduce the advantages and technical indicators of carbon fiber cloth, and the detailed construction technology of carbon fiber cloth in reinforcement of metro tunnel disease, that caused by local lining structure strength is not sufficient. This introduced reinforcement measures, which uses carbon fiber cloth in metro diseases could guide in the same engineering.

Study on Numerical Analysis of Tunnel Longitudinal Uneven Settlement Base on Elastoplastic Theory

2012 ◽  
Vol 446-449 ◽  
pp. 596-600
Author(s):  
Shou He Wu ◽  
Zhong Li ◽  
Si Yang Chen
Keyword(s):  
Longitudinal Design ◽  
Three Dimensional ◽  
Shell Element ◽  
Calculation Model ◽  
Tunnel Lining ◽  
Vertical Force ◽  
Tunnel Structure ◽  
Lining Structure ◽  
Element Type ◽  
The Impact

The stratum uneven settlement of tunnel is main factors that cause damage of tunnel longitudinal structure. a 3d numerical model is established for the force and deformation calculation of tunnel structure based on the elastoplastic theory. In the model, soil material is elastoplastic, and its constitutive model is Mohr Coulomb, the element type of soil is a three-dimensional solid, the element type of tunnel lining structure is space shell element, and tunnel settlement joint is three-dimensional linear spring. Calculation shows that, this calculation model is able to fully consider the impact of tunnel uneven settlement in all factors, and can simulate the vertical force and deformation behavior of tunnel structure in complex ground formation conditions. Research conclusion gives the vertical force and deformation of the tunnel structure under the condition of the stratum uneven settlement. It is very important reference for the longitudinal design and calculation of the tunnel lining structure.

Research on Dynamic Response of Underground Circular Lining Tunnel under the Action of P Waves

2011 ◽  
Vol 99-100 ◽  
pp. 181-189 ◽  
Author(s):  
Hua Xu ◽  
Tian Bin Li ◽  
Long Qi Li
Keyword(s):  
Stress Concentration ◽  
Dynamic Stress ◽  
Fundamental Problem ◽  
Earthquake Damage ◽  
Tunnel Lining ◽  
Dynamic Stress Concentration ◽  
Tunnel Structure ◽  
P Waves ◽  
Infinite Space ◽  
Rock Tunnels

Dynamic stress concentration of tunnels and underground engineers under the action of earthquake waves is a fundamental problem. Selecting circular lining tunnel in semi-infinite space under the action of P waves as prototype, based on the assumption of large circular arc, a set of dynamic stress series solution in semi-infinite space and lining is deduced by wave function expansion method. With specific examples, the influences on shallow-buried depth rock tunnels of different factors which include incident frequency, incident angle, buried depth, rock conditions and lining rigidity are studied. The results show that low-frequency P waves are more dangerous to tunnel lining than high-frequency P waves; When P waves is incident from the bottom of the vertical tunnel or small angle (θα = 0° ~ 30°), the damage of tunnel lining is more seriously; Under the hard rock conditions, when the tunnel buried depth reaches more than 100m, the thickness of overlying rock is not a major factor effecting the dynamic stress and earthquake damages of tunnel structure lining; Under the soft surrounding rock condition, the value of dynamic stress concentration coefficient of lining is still up to 6.5 when the buried depth of tunnels is more than 100m, and what’s more the tunnel lining may still be caused seriously earthquake damage; With the increasing of lining stiffness, the dynamic stress concentration of lining is more uneven, and the value span is greater; so under the premise of meeting bearing capacity and deformation of lining, soft lining is recommended to adapt in the tunnel structure to decrease earthquake damage of tunnels.

scholarly journals The Influence Evaluation of the Waste Slag Above Tunnel on the Safety of the Structure of the High-Speed Railway Tunnel

2020 ◽  
Author(s):  
Weigong Ma ◽  
Weibo He
Keyword(s):  
High Speed ◽  
Great Influence ◽  
Back Analysis ◽  
Tunnel Lining ◽  
Tunnel Structure ◽  
Destructive Testing ◽  
High Speed Railway ◽  
Lining Structure ◽  
Design Documents ◽  
The Stability

A high-speed railway loess tunnel being built is in the Shallow-Buried Section because the construction party violates the design, and the slag discarded at the top of the tunnel is just down-pressing the main line. In order to ensure that the stability of tunnel structure does not affect the safe operation in the later period, a stratum structure model is established based on non-destructive testing and on-site tunnel monitoring measurement. The parameters of surrounding rock are determined by displacement back analysis method, and the influence of waste slag on the safety of tunnel structure is checked by the parameters obtained from back analysis. Through the comparative analysis of the stress of tunnel lining under two working conditions, combined with relevant codes and design documents, it is considered that the slag has a great influence on the stress of tunnel lining structure, but the sectional strength and maximum crack width of eccentrically compressed components of tunnel lining meet the design requirements, and the structure is within the safety range.

scholarly journals Application and Research of Geologic Radar in Groundwater Disease of Tunnel Engineering Inspection

2019 ◽  
Vol 131 ◽  
pp. 01063
Author(s):  
Yu Wang ◽  
chuang-sheng Wu ◽  
Zongying Shu
Keyword(s):  
Tunnel Lining ◽  
Image Feature ◽  
Concrete Lining ◽  
Hole Drilling ◽  
Boundary Line ◽  
Tunnel Engineering ◽  
Hole Drilling Method ◽  
Geological Disaster ◽  
Pass Through ◽  
Controlling Measures

As a kind of underground lineament building, the tunnel inevitably will pass through different hydrology geology in construction process and thus form a catchment corridor which usually occurs in most of tunnels. Pour water and waterlogging is a common geological disaster and the main disease both in the construction tunnels and operation tunnels. So it is urgent for us to carry through the research on the geological disaster of groundwater. The Inspecting and controlling measures against the ground water geological disaster are also needed. In this paper, Geologic Radar is applied to tunnel engineering quality inspection to detect some quality problems possibly caused by groundwater. In order to diagnose the disease degree of operation tunnels and to estimate tunnel’s security condition, this paper analyzes the causes of bugs existing behind the tunnel lining, expounds the theory and method of making non-destructive test on tunnel lining quality by using Geological Radar. By processing and analyzing field data, the following functions can be performed, such as detecting the thickness of concrete lining accurately, determining the distribution position and quantities of rebar and grid steel, searching existed cavity and uncompacted area behind the lining especially lining arch top. We also apply the method of morphology to the extraction of liner image feature. We get the liner boundary line and waterlogging area more intuitively by wavelet analysis, and find the anomalous point in the liner. It has been proved that Geologic Radar is a feasible method to inspect the structure of tunnel concrete lining. Adopting hole-drilling method to make verifications with detecting results of geological radar, the results of the two kinds of methods do not have big difference.

The Application of Fuzzy AHP in Safety Evaluation of Highway Construction Crossover Operation

2015 ◽  
Vol 738-739 ◽  
pp. 512-518
Author(s):  
Zhu Lu ◽  
Han Kun Yu ◽  
Peng Gang ◽  
Xiao Yang Ni
Keyword(s):  
Qualitative Data ◽  
Fuzzy Ahp ◽  
Highway Construction ◽  
Safety Evaluation ◽  
Construction Technology ◽  
Exchange Of Information ◽  
The Cross ◽  
Selection Of

With the progress of highway construction technology and the difficulty of operation, cross-operation becomes emerging constantly, but safety accidents also appear constantly and the problem is how to ensure the cross-operation security. In order to ensure the safety of highways cross operation, we evaluated the security of cross-operation. We choose the method of fuzzy AHP which can quantify the qualitative data. In the selection of indicators, we choose “exchange of information” as an index which evaluated the security of cross-operation of YIBA highway construction by fuzzy AHP.

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