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Study on a Subway Shield Tunnel under the Excess Pore Pressure by High-pressure Jet Grouting

Author: WengChengXian
Tutor: ZhangQingHe
School: Tongji University
Course: Structural Engineering
Keywords: Shield Tunnel Displacement back analysis High pressure jet grouting pile Cavity expansion theory
CLC: U451
Type: Master's thesis
Year: 2006
Downloads: 405
Quote: 6
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Abstract


For Metro Shield Tunnel project examples by the high pressure jet grouting pile construction impact damage , to explore how to correctly evaluate the high pressure jet grouting pile construction caused by the lateral extrusion pressure , how to effectively control the deformation of the subway tunnel to ensure that the operators of subway safety problems. Obtained on the basis of the analysis of high-pressure jet grouting foundation reinforcement mechanism of soil around the pile in the process of high pressure jet grouting piles and static pressure Pile distribution of the similarities and differences in the stress state . Concept introduced area replacement ratio m , based on the elastoplastic soil mechanics and Vesic cavity expansion theory , the derivation of a high-pressure jet grouting pile construction China and Turkey stress increment theory formula of ultra- high pressure jet grouting Pile The theoretical calculation of the pore water pressure . SAP2000 program to establish the shield tunnel unilateral additional pressure finite element model , several finite element being analyzed to obtain a set of lateral additional pressure values ??and draw out both the tunnel cross-section corresponding to the displacement amount relationship map , combined with construction measured displacement values ??, the inverted real a lateral additional pressure value . Determine the lateral additional pressure for money , combined with the theory of soil stress increment calculation derived formula inversely undetermined parameters in the area of ??theoretical formulas replacement ratio m , as well as the more common high-pressure injection project the flow pressure attenuation unknown parameters K and n empirical formula . Theoretical formulas and empirical formulas were used to seek unearthed in the distribution of the pressure increment , comparative analysis showed that the replacement ratio m determine the area under the premise , the high pressure jet grouting pile equivalent jacked pile into a pile after the reduction of the cross-sectional area and the use of the derived formula to estimate the effect of the high pressure jet grouting pile of soil compaction . Finally , based on the high pressure jet grouting pile construction technology and soil pressure increment , raised a number of high-pressure jet grouting Pile Foundation Construction Optimization recommendations .

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