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Study on Soil Deformation Analysis Induced by Shield Tunnel

Author: ZhangJinJu
Tutor: WeiXinJiangï¼›WeiGang
School: Zhejiang University
Course: Geotechnical Engineering
Keywords: Shield Tunnel Settlement Prediction Soil deformation Soil loss Three-dimensional solution Mathematical prediction model Radial basis function network
CLC: U451
Type: Master's thesis
Year: 2006
Downloads: 644
Quote: 18
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Abstract


With social advancement and urbanization Shield technology matures, the three-dimensional space in urban development, the shield tunneling method in more and more applications. As we all know, the shield law has unparalleled advantages, such as for a wide range of small impact on the normal function of the city, you can meet some special works and so on. But shield construction will inevitably lead to ground and underground soil movement, when the soil displacement is too large, the neighboring building (structure) and underground pipelines and other facilities would be a hazard. This paper shield tunneling induced soil deformation were studied, including: shield construction value of land subsidence caused by the maximum theoretical formula of exploration; shield construction of soil deformation caused by three-dimensional solution; settlement after shield tunnel The mathematical model to predict the settlement after shield tunnel and artificial neural network. In this paper, the innovative work and perspectives are as follows: (a) test of the classic shield tunnel subsidence prediction formula-Peck formula, seeking the most important parameters in the formula S max theoretical support. According to the actual process of shield construction, the establishment of a simple model, derived shield construction value of land subsidence caused by the maximum theoretical calculation formula. Numerical example shows that this method is used to predict the value of the maximum surface subsidence engineering precision can meet the requirements. (2) using the method of images derived binding Sagaseta obtain soil loss along the tunneling direction distribution formula, the formula will Loganathan (soil deformation of the two-dimensional solution) expanded to a three-dimensional deformation of soil solution obtained at any point due to shield construction The vertical and horizontal displacement formula focuses on the horizontal displacement caused by shield construction. Analysis showed that: compared with the measured values ??of vertical settlement agreement, but part of the horizontal displacement of the measured values ??have some differences, when the shield forward posture deviations, local Overexcavation so may be an important reason for this difference. (3) collected on the highway embankment, building foundations and other settlement prediction of eight more commonly used mathematical models for the first time these eight models used to predict the shield tunnel induced settlement after. Engineering example using 11 inspection, according to the prediction accuracy of the results, these eight models are divided into three categories. And that the first class model (Deng Ying Er prediction model, Mmrgan-Mercer-Flodin prediction model) better prediction accuracy can be used to predict the long-term settlement after shield tunneling work. (4) the use of radial basis function network theory, the use of matlab software programming for shield tunneling work after long-term settlement prediction. In actual operation, the training (ie, fitting) and simulation (ie prediction) integration, the predicted results with high accuracy. By 11 numerical example shows that artificial neural network can be used to predict the settlement after shield tunnel.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel structure theory
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