Construction Process Numerical Simulation and Experimental Research of Parallel-Adjacent Loess Tunnel

2012 ◽  
Vol 446-449 ◽  
pp. 2186-2191
Author(s):  
Jian Guo ◽  
Qi Cai Wang ◽  
Rong Ling Zhang ◽  
Zhi Guo Yang
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Experimental Research ◽  
Tunnel Lining ◽  
Tunnel Construction ◽  
Construction Process ◽  
Tunnel Excavation ◽  
Lining Structure ◽  
Loess Region ◽  
The Impact

According to the mechanical properties of the parallel-adjective tunnel, the construction process is simulated and the displacements and concrete stress of the lining structure is monitored of an actual tunnel in the loess region. The influence which the new tunnel on the existing tunnel lining during the new tunnel construction process studied by comparatively analyzed the numerical simulation and monitoring the results. The results show that the impact on the existing tunnel during the new tunnel excavation changes with tunnel distance and the excavation method of the new tunnel, when the line distance increases the impact on the existing tunnel has been remarkably reduced.

Analysis of the Mechanical Property of Collapse in Shallow-Buried Loess Tunnel under Unsymmetrical Pressure

2013 ◽  
Vol 645 ◽  
pp. 426-429 ◽  
Author(s):  
Xiao Hui Xue ◽  
Zhong Ming Su
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Mechanical Property ◽  
Finite Element ◽  
Collapse Mechanism ◽  
Tunnel Excavation ◽  
Finite Element Numerical Simulation ◽  
Tunnel Collapse ◽  
Primary Support

Based on selecting a tunnel collapse under typical conditions of the shallow-buried terrain under unsymmetrical pressure, analyzing the monitoring measurement date, using the software of finite element numerical simulation, the paper simulates the tunnel excavation in lengthwise, deduces the change laws of stress in primary support, the mechanical properties and the collapse mechanism.

Numerical Simulation for the Excavation in Tunnel Construction

2011 ◽  
Vol 90-93 ◽  
pp. 90-93
Author(s):  
Yong Suo Li ◽  
Ke Neng Zhang ◽  
Xian Yang ◽  
Chang Bo Huang
Keyword(s):  
Numerical Simulation ◽  
Tunnel Construction ◽  
Simulation Methods ◽  
Underground Engineering ◽  
Tunnel Excavation ◽  
Construction Procedure ◽  
Mine Excavation ◽  
Numerical Simulation Methods ◽  
Explicit Finite Difference ◽  
Real Practice

Tunnel excavation is often done in underground engineering such as civil tunnel construction and mine excavation. The numerical simulation can output colorful results to interpret the tunnel excavation effect more easier. Among all the numerical simulation methods, fast lagrangian explicit finite difference code of continua (FLAC3D) is widely used to solve practical problems, especially in field of elasto-plastic characteristic and construction procedure. So in the present paper, 3 steps of excavations in a tunnel is modeled by FLAC3D to present the stress and displacement distribution, and give guidance for the real practice.

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.

Numerical Simulation for Construction Process Large-Span Flat Tunnel under the Condition of Shallow Buried

2014 ◽  
Vol 580-583 ◽  
pp. 1100-1104
Author(s):  
Jun Jie Li ◽  
Li Tuo ◽  
Guan Jun Zhang
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Tunnel Construction ◽  
Construction Process ◽  
Large Span ◽  
Tunneling Method ◽  
Stress Changes ◽  
Flac 3D ◽  
3D Software ◽  
Grade Rock

The thesis takes a three-lane tunnel construction in Zhejiang as an example. Simulating the course of dynamic construction of large-span tunnel on geology condition of four-grade rock mass and shallow buried by FLAC 3D software ,it carries out comparative and stress situation in the runnel surrounding rocks .Getting the displacement and stress changes rule of the construction by using benching with a small pilot tunnel tunneling method can guide the construction scientifically.

Tunnel Strength and Excavation Effect under Different Stress Paths

2013 ◽  
Vol 470 ◽  
pp. 902-906
Author(s):  
Zhi Li Sui ◽  
Zhao Guang Li ◽  
Zhi Jun Yang ◽  
Ran Shen ◽  
Xu Peng Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Stress Path ◽  
Failure Strength ◽  
Engineering Property ◽  
Tunnel Excavation ◽  
Strong Basis ◽  
Tunnel Stability ◽  
Compression Failure ◽  
The Impact ◽  
Surrounding Soil

The stress path division of soil strata surrounding the excavation tunnel was obtained by numerical simulation, and based on this, the impact variation of different stress paths to the surrounding soil strength was gotten by laboratory triaxial test. The results show that tunnel excavation can result in four different stress path divisions of the soil strata, which have deferent failure to the tunnel stability. Deferent paths have respective failure forms, and the failure strengths are basically the same when the forms are identical (extrusion failure or compression failure) even if the paths are different, but to deferent forms, the failure strength are deferent, generally speaking, the strength of extrusion failure will be 10% ~25% lower than that of compression failure. These researches can provide strong basis for accurately study about the influence of engineering property of environmental soil strata.

Experimental Research and ANSYS Analysis of Temperature Field of Concrete Specimens Reinforced by Paste Method in the Fire

2013 ◽  
Vol 405-408 ◽  
pp. 2677-2680
Author(s):  
Yan Bo Li ◽  
Jian Zhong Liu ◽  
Su Juan Fu
Keyword(s):  
Mechanical Properties ◽  
Temperature Field ◽  
High Temperature ◽  
Experimental Research ◽  
Fire Retardant ◽  
Experimental Results ◽  
Temperature Fields ◽  
Ansys Analysis ◽  
Reinforcement Material ◽  
The Impact

In this paper, the temperature fields of concrete specimens reinforced by paste method were analyzed by experiment and ANSYS in the fire, it proved that the impact of reinforcement material on the temperature field of the specimens can be ignored, it identified that the best thickness of the fire-retardant coating is 40mm for steel-confined specimens and 50mm for CFRP-confined specimens. The calculations agreed well with the experimental results, it provides conditions for mechanical properties of the concrete reinforced by paste method at high temperature.

Numerical Simulation and Experimental Research on Fatigue Strength of the Injector Guide Pillar under Complex Loads

2010 ◽  
Vol 118-120 ◽  
pp. 196-200
Author(s):  
Jin Guo Li ◽  
Xiao Gui Wang ◽  
Zeng Liang Gao
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Numerical Simulation ◽  
Experimental Study ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Numerical Analysis ◽  
Experimental Research ◽  
Contact Surface ◽  
Electronic Measurement

Under the complex loads, the injector guide pillar (IGP) used in injection machine was failure only after 1.5-year-service. In order to determine the cause of the fracture, the numerical simulation technology was applied to analyze the mechanical properties of the IGP. The contact between the mating surfaces of the clamping mechanism was modeled; nonlinear multi-region contact of surface-surface was applied to establish the contact model of FEA. The constraint of tie was used for modeling thread joint. The simulated results indicated that the smaller area of contact surface, the higher value of stress in the neck of IGP. Electronic measurement was also used to check the results of stress in IGP obtained by FEA. It was found that the experimental data agreed well with simulated results. Based on the numerical analysis and experimental study, the structure of IGP was improved by adopting a smoother double-round neck. The fatigue life of the improved structure was longer than that of the original machine.

Numerical Simulation on the Stress and Strain of Lining Structure with Double Shield Tunneling Construction

2012 ◽  
Vol 605-607 ◽  
pp. 2425-2429
Author(s):  
Feng Wang ◽  
Tie Jun Cui
Keyword(s):  
Ground Surface ◽  
Calculation Model ◽  
Tunnel Lining ◽  
Concrete Lining ◽  
Shield Tunnel ◽  
Tunnel Construction ◽  
Three Dimension ◽  
Shield Tunneling ◽  
Deformation Law ◽  
Lining Structure

This paper takes the Section 201 of shield construction engineering in Dalian Metro Line 2 as an example to analyze the deformation law of surrounding soil and the tunnel lining structure stress during shield tunnel construction. The shield tunnel construction is simulated dynamically by ADINA and the shield tunnel structure model of the concrete lining is established. This model is a three-dimension nonlinear finite element calculation model concerned with the grouting soil and original state soil. Taking the soil lithology in the upper layer and interact influences, we analyzed the dynamic process of shield construction, soil grouting and lining supporting and the stress distribution in difference reinforced concrete supporting segments and the ground settlement characteristics. Through numerical analysis method to study the deformation law of soil surrounding tunnel and the stress in tunnel lining, we get the results to compare with the results of Peck formula under the same condition. After generating the conclusions, we can provide several suggestions for shield tunneling construction, lining segment design and control of the ground surface settlement during the construction.

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