Research on Surface Deformation Control of Tunnel Construction Under-passing Petroleum Pipeline

2021 ◽  
Author(s):  
Guowei Zhang ◽  
Dewu Li
Keyword(s):  
Surface Deformation ◽  
Tunnel Construction ◽  
Deformation Control

Research of Surface Deformation with Metro Double Tunnels Construction and the Relative Position Change

2011 ◽  
Vol 462-463 ◽  
pp. 732-737
Author(s):  
Yan Kai Wu ◽  
Wei Feng
Keyword(s):  
Relative Position ◽  
Traffic Congestion ◽  
Horizontal Plane ◽  
Surface Deformation ◽  
Surface Subsidence ◽  
Structural Safety ◽  
Tunnel Construction ◽  
Position Change ◽  
Construction Sequence ◽  
Tunnel Design

With the rapid development of our economy, the urban traffic becomes increasingly busy. To ease traffic congestion, underground rail transportation is becoming one of the main modes of transportation in city. At present in order to relieve the traffic congestion most major cities in China are accelerating the construction of subway tunnels. The relative position change of metro double tunnels and construction of the sequence will affect the surface subsidence deformation and the interaction of the tunnel lining. It is more concerned about these issues in tunnel design. It is the main purposes, in this paper, to analyze the metro double tunnels surface deformation, which affect by the position changes of new construction double and the sequence of construction. From the numerical simulating results, in order to reduce surface subsidence and ensure the structural safety over the subway tunnel, it should try to make double-tunnels at the same horizontal plane in design. If the double tunnels could not be located at the same horizontal plane, the double-hole tunnel construction sequence of the deformation of the surface subsidence effects are obvious it is obvious that the double tunnels construction sequence differently make the deformation of the surface subsidence. To reduce the deformation of the surface subsidence, it should be first excavated the shallow tunnels and then excavated the tunnel buried deeply. The ideal distance of the double tunnels center is greater than 4 times the tunnel diameter. It can make the surface subsidence reduce to the minimum during the metro tunnel construction.

Finite Element Analysis for the Displacement Characteristics of Loess Tunnel with Weak Surrounding Rock

2012 ◽  
Vol 487 ◽  
pp. 64-68
Author(s):  
Qian Zhang ◽  
Hai Xia Zhang ◽  
Jin Xing Lai
Keyword(s):  
Surface Deformation ◽  
Surrounding Rock ◽  
Tunnel Construction ◽  
Element Analysis ◽  
Tunnel Excavation ◽  
Qinghai Province ◽  
Elastic Plastic ◽  
Excavation Process ◽  
Reinforcement Measures ◽  
Weak Surrounding Rock

Backed up by Dayoushan loess tunnel of Xining in Qinghai province, the displacements of vault settlement, peripheral convergence, surface deformation and post-construction settlement caused by tunnel construction are numerically simulated and analyzed. First, 2-D elastic-plastic model is founded to simulate the tunnel excavation process with up and down steps method. Second, considering the rheological characteristics of loess, 2-D visco-elastic-plastic constitutive model is founded to simulate the creep deformation of rock displacement characteristics. Finally, combined with the serious collapsible feature of loess foundation in supported project, the post-construction settlements under different conditions are simulated to obtain the settlement values of tunnel vault and bottom. The results can explain the deformation laws of tunnel displacement characteristics reasonably and show the importance of foundation reinforcement measures for loess tunnel.

scholarly journals Analysis on Treatment Effect of Mine Tunnel Construction Spring in Karst Area

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Bocheng Liu ◽  
Wenlong Ye ◽  
Chunming Zhu ◽  
Ran Chen ◽  
Songxian Huang ◽  
...  
Keyword(s):  
Surface Deformation ◽  
Karst Area ◽  
Construction Technology ◽  
Surrounding Water ◽  
Deformation Control ◽  
Railway Line ◽  
Filling Materials ◽  
Tunnel Inspection ◽  
The Stability

The investigation of ultrashallow buried mining method in an interval revealed the existence of the karst fracture zone. The flow rate of 9 springs exposed in the initial excavation was relatively large, and the total water output per hour was nearly 300 m3. The filling materials in karst channels or fissures had the risk of bursting during excavation. Moreover, the ultrashallow buried tunnel undercrossed a special railway line, and the construction required higher surface deformation control. In view of the abovementioned risk problems, based on the grouting ideas of “assessment of influence,” “determination of surrounding rock,” “zone positioning,” and “dynamic grouting,” the grouting design scheme is dynamically optimized, and the grouting construction of surrounding water is cut off. Combined with the tunnel inspection, monitoring data, and numerical analysis, it is verified that the construction technology adopted in the project can ensure the stability of the project, which can provide a reference for similar projects.

Numerical Analysis of Tunnel Excavation Method at Greatly Cross Undermine Huangzhuang Station of Beijing Subway

2011 ◽  
Vol 243-249 ◽  
pp. 5789-5793
Author(s):  
Jin Shui Xie ◽  
Ming Zhou Bai ◽  
Zhao Yi Xu ◽  
Ming Xing Xu ◽  
Zhu Shi ◽  
...  
Keyword(s):  
Numerical Calculation ◽  
Numerical Analysis ◽  
Surface Deformation ◽  
Ground Surface ◽  
Side Wall ◽  
Tunnel Construction ◽  
Tunnel Excavation ◽  
Geological Conditions ◽  
Numerical Calculation Method ◽  
Beijing Subway

Combined with the geological conditions and the project features, the selection problem of pilot tunnel construction method of Huangzhuang station is solved. Directing at the commonly used method including CD method, CRD method and double side wall pilot tunnel method, FLAC3D numerical calculation method is adapted to analysis and predict the ground surface deformation and supporting structure hand features. Through analyzing the size and law of surface settlement in this section, the feasibility and differences of these methods is concluded and analyzed. And finally an example is given.

scholarly journals Simulation of surface deformation control during selective laser melting of AlSi10Mg powder using an external magnetic field

AIP Advances ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 045012 ◽  
Author(s):  
Liwei Chen ◽  
Hui Li ◽  
Sheng Liu ◽  
Shengnan Shen ◽  
Tao Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Selective Laser Melting ◽  
Surface Deformation ◽  
Laser Melting ◽  
Deformation Control
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