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The soft slate tunnel large deformation mechanical behavior and control technology

Author: DuYanPeng
Tutor: FuHeLin
School: Central South University
Course: Civil Engineering
Keywords: Slate tunnel Hydrological characteristics Creep characteristics Numerical Simulation Monitoring and Measurement Large deformation control
CLC: U451
Type: Master's thesis
Year: 2011
Downloads: 88
Quote: 1
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Abstract


Soft rock deformation control is the tunnel construction need to solve the technical problems. In this paper, the Hunan Provincial Department issues (2009024) to pregnant through highway soft slate tunnel relying commenced the soft slate tunnel large deformation mechanical behavior control technology research. Specific research results are as follows: 1. Select a slate sample ingredient identification and microstructure observation under an electron microscope to understand its composition, microscopic structure and the characteristics of the particles of cementation way; through slate absorbent expansion disintegration understanding of water on the slate of the role and impact of the law, and the variation of the formula obtained water absorption, expansion, fitting a corresponding parameters; under different moisture conditions indoor to compression test understanding of the water on the slate The mechanical properties of slate anisotropy of mechanical properties; state by Fu water contact angle, the micro-structure of the Slate Water rational mechanism. According creep curves of typical creep process detailed descriptive analysis; summarize existing theory of creep constitutive model based on the slate Experimental study of creep properties, create a simple this constitutive model; indoor COMPRESSION TEST, different pressure difference with of different moisture slate creep characteristics studied, and the experimental results fit the proposed constitutive model; Finally, from the micro level analysis of the law and mechanism of the influence of water on the creep. The the weak slate tunnel excavation and support and deformation control based on FLAC3D numerical simulation, calculated by the model and analysis of the impact of the creep of the tunnel excavation; established only anchor spray foundation support, without applying the anchor increase the grouting reinforcement and advance support the four conditions of excavation and support conditions model numerical calculations from stress situation, the crown settlement the hole week level convergence, supporting displacement and force of the three models The results were compared to study and discuss the effect of deformation control of the weak slate tunnel support system, to summarize the best solution of the soft rock tunnel support and control of large deformation. 4. Regiment red soft slate tunnel relying on finishing their actual monitoring measurement data analysis, and actual monitoring measurement data fitting results and numerical analysis results than analysis of monitoring measurement regression fitting rationality and security status by monitoring the results of the evaluation of tunnel construction.

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