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Research into Earth Pressure Control of Epb Shield Tunnelling Machine

Author: HuShaoHua
Tutor: HuGuoLiang
School: East China Jiaotong University
Course: Mechanical and Electronic Engineering
Keywords: Earth pressure balance shield machine Earth pressure balance control AMESim simulation PID control BP neural network Mathematical model
CLC: U455.43
Type: Master's thesis
Year: 2009
Downloads: 166
Quote: 0
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Abstract


Earth Pressure Balance Shield (Earth Pressure Balance, EPB) shield construction is more common to use a tunneling Special construction equipment. The construction process, the earth pressure balance shield commonly used soil tank pressure control to ensure the stability of the excavation face. If there is not enough soil tank pressure will cause the front foundation settlement, excavation surface water gushing or will increase the danger of collapse; if the pressure is too large, would lead to the increase in the cutterhead torque or thrust propeller slow down or spewing and other issues. Therefore, setting reasonable construction soil tank pressure to improve the stability of shield tunnel in the construction process, has a very important significance for controlling surface subsidence, improve the driving speed, reduce excavation costs. The domestic the soil tank pressure control research is not yet mature, often using the \Through the soil compartment preset pressure value, and then according to the actual construction of the case, the pressure of the soil compartment adjusted. This lag adjustment method, often can not control the surface settlement, causing surface uplift or subsidence, causing great danger to the surface surrounding buildings, the quality of the project can not achieve the desired objectives. The soil tank pressure control of the earth pressure balance shield machine to do the following work: 1, Shield three hydraulic system simulation platform, put forward three kinds of earth pressure balance control modes of operation, AMESim simulation lay the foundation. AMESim simulation software to build three control modes of operation under the earth pressure balance control model, conventional PID control strategy to achieve the earth pressure balance control. AMESim environment simulation, simulation results show that the conventional PID control can be achieved the Soil Pressure balanced control requirements, conventional PID control algorithm takes a long time to adjust, poor response characteristics. 3, the rise of the neural network can be fully approximation arbitrarily complex nonlinear relationship between learning and adaptive do not know or uncertain system, shield earth pressure balance control system of nonlinear, time-varying uncertainties, Therefore, the application of neural networks on the shield machine earth pressure balance control can achieve real-time control purposes. Establishment of earth pressure balance control model based on BP neural network input output Matlab7.0 neural network toolbox to modeling and simulation, the simulation results obtained satisfactory results. 4, the establishment of a mathematical model of the earth pressure balance shield, and based on the mathematical relationship between the earth pressure balance shield and its main operating parameters. And the large tunneling experiments through the Shield simulation platform to verify the correctness of the earth pressure balance mathematical model. Provide reference for our territory and the design of the pressure balance shield machine and tunnel excavation construction.

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