The Research of Backfill Grouting Pressure in Shield Tunneling

2012 ◽  
Vol 446-449 ◽  
pp. 2240-2245
Author(s):  
Jin Li Qiao ◽  
Yong Li Fan ◽  
Bo Liu ◽  
Yan Ping Zhang ◽  
Yan Yan Li
Keyword(s):  
Injection Pressure ◽  
Tunnel Construction ◽  
Simulation Studies ◽  
Relative Method ◽  
Ground Settlement ◽  
Stress Growth ◽  
Shield Tunneling ◽  
Grouting Pressure ◽  
Slurry Injection

As to shield tunneling, that soil is reinforced into the void is one of the most important reasons which cause the ground settlement, and always most important factor in the tunnel construction and the relative research. The numerical simulation studies presented in this paper focus on the different grouting pressure causing different ground settlement, plastic area and stress growth behavior. Based on the simulation results and the engineering ground settlement limit, propose reasonable synchronous slurry injection pressure and the relative method of controlling ground settlement. Propose reasonable suggestion for the determination of grouting pressure during shield construction.

Impact of Double-O-Tube Shield Tunnel Construction on Grillage Beams Foundation Frame Building

2011 ◽  
Vol 71-78 ◽  
pp. 32-36 ◽  
Author(s):  
Xin Jiang Wei ◽  
Jie Hong ◽  
Gang Wei
Keyword(s):  
Principal Stress ◽  
Differential Settlement ◽  
Shield Tunnel ◽  
Tunnel Construction ◽  
Foundation Settlement ◽  
Ground Settlement ◽  
Shield Tunneling ◽  
Frame Building ◽  
Shield Machine ◽  
The Impact

Considering the interaction of building-soil-tunnel, the grillage beams foundation frame building vertical crossed by Double-O-Tube (DOT) shield tunnel was simulated by 3D MIDAS/ GTS software, and the impact of construction on the building was analyzed. The results show that: the ground settlement trough caused by DOT shield tunnel can be fitted by peck formula; during the passage of the shield tunneling through the building, the settlement of the building increased and settlement trough was wilder; the settlement was stable and had a little rebound when shield machine already passed the building; with the increase of driving distance, the first principal stress P1 increased and then was stable; with the increase of L, the shape of foundation settlement curve changed, and the maximum differential settlement between columns increased but was small.

Analysis on Influence of Shield Tunneling on Bridge Double Pile

2015 ◽  
Vol 777 ◽  
pp. 3-7
Author(s):  
Pei Sheng Xi ◽  
Xiao Zhao ◽  
Zhen Li
Keyword(s):  
Horizontal Displacement ◽  
Horizontal Direction ◽  
Shield Tunnel ◽  
Tunnel Construction ◽  
Ground Settlement ◽  
Lagrangian Analysis ◽  
Shield Tunneling ◽  
Tunnel Excavation ◽  
Pile Deformation ◽  
Main Deformation

Shield tunneling have varying degrees of impact on the surrounding buildings and the surrounding environment. Based on the shield tunneling of Hefei Subway Line 1 Ma'anshan viaduct, a 3D Fast Lagrangian Analysis of Continua is be used to simulate the shield tunnel construction and analyze the ground settlement and bridge pile deformation caused by tunnel construction. The numerical modeling results by analyzing the displacement variation and soil affected area at different distances show that when the shield tunnel excavation, the ground settlement becomes smaller with increasing distance from the shield center line of the pile and the maximum ground settlement is 10.778mm. The main deformation of bridge pile is in horizontal direction with a maximum horizontal direction of 2.0758mm. Horizontal displacement changes lager at the top of the pile, along with changes in the horizontal displacement of the pile depth becomes smaller, 15m is a turning point.

Study on Underground Utilities Settlement during the Construction of Shield Tunnel

2011 ◽  
Vol 243-249 ◽  
pp. 3445-3448
Author(s):  
Hai Xia Sun ◽  
Hai Yu Wu ◽  
Wen Zhao
Keyword(s):  
Stress Field ◽  
Ground Water ◽  
Water Table ◽  
Continuity Equation ◽  
Shield Tunnel ◽  
Tunnel Construction ◽  
Hydrodynamic Equations ◽  
Ground Settlement ◽  
Shield Tunneling ◽  
Underground Utilities

Shield tunneling construction inevitably makes impacts on underground utilities. This paper takes some Metro engineering for background, study the underground utilities settlement rules induced by shield tunneling construction. As for shallow-buried and high ground water table tunnel, the coupling of hydrological and stress field must be paid attention. By seepage continuity equation and hydrodynamic equations, study changing situation of the deformation and stress by contrast the effect of seepage. And, contrast the measured value and simulation value to verify the rationality of using fluid-solid coupling method to forecast the ground settlement during tunnel construction.

A Progress Report on the Quest to Establish a Cybersickness Dose Value

2002 ◽  
Vol 46 (26) ◽  
pp. 2119-2123 ◽  
Author(s):  
Wei Chen ◽  
S.L. Yuen ◽  
R.H.Y. So
Keyword(s):  
Linear Relationship ◽  
Motion Sickness ◽  
Progress Report ◽  
Simulation Studies ◽  
Current Effort ◽  
British Standard ◽  
The Past ◽  
Frequency Weighting ◽  
Made In

This paper summarizes the progress made in the quest to establish a Cybersickness Dose Value (CSDV). The Motion Sickness Dose Value (MSDV), reported in the British Standard BS6841, has been used to predict the severity of seasickness since 1987. In 1999, the authors of this paper proposed a CSDV formulation with a structure similar to that of the MSDV (So, 1999). Since then, several experiments and simulation studies have been conducted to modify and develop the proposed CSDV formula. In particular, progress has been made in (i) the methods to measure CSDV, (ii) the determination of a frequency weighting curve to equalize the non-linear relationship between the navigation velocity and levels of cybersickness, and (iii) the detailed formulation of CSDV. This paper summarizes the past progress and reports on the current effort in developing a CSDV.

A New Technique to Predict In Situ Stress Increment Due to Biowaste Slurry Injection Into a Sandstone Formation

2018 ◽  
Vol 140 (12) ◽  
Author(s):  
Sherif M. Kholy ◽  
Ahmed G. Almetwally ◽  
Ibrahim M. Mohamed ◽  
Mehdi Loloi ◽  
Ahmed Abou-Sayed ◽  
...  
Keyword(s):  
Function Analysis ◽  
Injection Pressure ◽  
In Situ Stress ◽  
New Technique ◽  
Strong Impact ◽  
Stress Increment ◽  
Injection Zone ◽  
Fracture Closure ◽  
Slurry Injection

Underground injection of slurry in cycles with shut-in periods allows fracture closure and pressure dissipation which in turn prevents pressure accumulation and injection pressure increase from batch to batch. However, in many cases, the accumulation of solids on the fracture faces slows down the leak off which can delay the fracture closure up to several days. The objective in this study is to develop a new predictive method to monitor the stress increment evolution when well shut-in time between injection batches is not sufficient to allow fracture closure. The new technique predicts the fracture closure pressure from the instantaneous shut-in pressure (ISIP) and the injection formation petrophysical/mechanical properties including porosity, permeability, overburden stress, formation pore pressure, Young's modulus, and Poisson's ratio. Actual injection pressure data from a biosolids injector have been used to validate the new predictive technique. During the early well life, the match between the predicted fracture closure pressure values and those obtained from the G-function analysis was excellent, with an absolute error of less than 1%. In later injection batches, the predicted stress increment profile shows a clear trend consistent with the mechanisms of slurry injection and stress shadow analysis. Furthermore, the work shows that the injection operational parameters such as injection flow rate, injected volume per batch, and the volumetric solids concentration have strong impact on the predicted maximum disposal capacity which is reached when the injection zone in situ stress equalizes the upper barrier stress.

The Research of Backfill Grouting Pressure in Shield Tunneling

2012 ◽  
Vol 446-449 ◽  
pp. 2240-2245
Author(s):  
Jin Li Qiao ◽  
Yong Li Fan ◽  
Bo Liu ◽  
Yan Ping Zhang ◽  
Yan Yan Li
Keyword(s):  
Shield Tunneling ◽  
Grouting Pressure
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