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The Numerical Simulation of Geological Applicability of Spoke Wheel

Author: TianQingQing
Tutor: WangYanQun
School: Tianjin University
Course: Solid Mechanics
Keywords: Shield ANSYS / LS-DYNA Stability Spoke cutter Soil Pressure Numerical Simulation
CLC: U455.43
Type: Master's thesis
Year: 2010
Downloads: 64
Quote: 0
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Abstract


As China's urbanization process is accelerating, because underground transport various advantages, many cities nationwide have launched a subway construction, and now the coordinated development of urban space subway is a new hot spot. With the mechanization of shield excavation, building on the ground interference, suitable for complex formation is conducive to environmental protection and other advantages, as the primary means of metro construction. The stability of the excavation face shield construction technology is the key issue, excavation face instability will often result in a serious accident, so how to ensure the stability of tunnel excavation interface, safe and efficient manner TBM tunnel construction is the field of science and technology work abroad by a hot research topic. Since tunneling interface stability and geological parameters, shield cutter type and construction techniques, and many other factors related to instability mechanism complex, in order to maintain the stability of the shield machine interface Soil Pressure is still mainly dependent on the determination of engineering experience. TBM cutterhead consists Spoke and panel type. Which Spoke cutter pressure due Dokura easy to control, lightweight, and low cost advantages in engineering applications has obvious advantages. Since Spoke cutterhead aperture ratio is large, compared to the panel cutter, cutter for excavation surface supporting effect is very weak, so Spoke cutter application subject to certain restrictions. Ability to maintain a stable interface during tunneling can choose Spoke cutter key issues. Therefore, we use numerical method Spoke cutter boring geological suitability and to maintain pressure on the interfacial stability required Dokura. In this paper, ANSYS / LS-DYNA finite element software, the constitutive model of the soil used in the nonlinear nature, using ALE algorithm to solve the large deformation of soil caused by cell distortion, etc., and Tianjin Metro Line project Zhangxingzhuang Station to Station range yixingbu geological exploration and construction reports based on reports, select the material parameters of the soil and yield criterion (Mohr-Coulomb), right-spoke Turkey cutter body stability during excavation was simulated. By Spoke cutter in Tianjin mucky soil geology at the excavation face adaptive finite element simulation, got Spoke cutter adaptability of this soil, the soil has been kept stable critical pressure value Dokura and the actual construction of the applied pressure value Dokura contrast. Based on Metro Line interval of some typical soil parameters summarized in Dokura pressure is constant, the different water content and cohesion with other geological parameters corresponding to the surface displacement. As used herein, the numerical simulation method can be used for different geology, different cutter boring interface stability analysis and interfacial stability required to maintain the scope of Soil Pressure.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel construction > Construction methods > Shield Law ( full- face excavation )
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