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Study on Construction Stability of the Underground Tunnel Hidden-digging Region in Shenyang

Author: CaiXiaoLi
Tutor: ZhaoWen
School: Northeastern University
Course: Engineering Mechanics
Keywords: Shallow Excavation FLAC-3D Construction process Stable
CLC: U455.4
Type: Master's thesis
Year: 2008
Downloads: 82
Quote: 0
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Abstract


With the improvement of China's comprehensive national strength, many large cities are among the international metropolis, its urban modernization will also speed, and ease urban traffic pressure on the city subway construction will be the most important. It can be expected that the 21st century will be the urban subway construction in China during the peak period. Mining method in order to adapt to the urban underground works there is no cut-and-cover conditions arising tunnel excavation method, due to its practicality and does not affect the superiority of the ground transportation, it is more and more widely. And it is precisely because it is mainly used in the urban underground works, so study the stability of Shallow Tunnels construction and the impact on the environment has a very important practical significance. In this paper, Shenyang metro project examples for the purpose to protect the self-stabilizing and guide the construction of the surrounding rock, using the method of combining on-site monitoring and numerical simulation from the surrounding rock deformation, surface subsidence surrounding rock and supporting structure stress, plastic domain, etc. aspects of the construction of the tunnel stability analysis of the system, the Shenyang sandy soil settlement construction, and proposed recommendations related warning value and stability of the discriminant. In addition, for Shenyang geological conditions, the paper using a numerical simulation method, focusing on construction methods, excavation footage, the double tunnel stagger distance affect the stability of tunnel excavation three construction factors, and optimize the construction program. The study said: mining method to build a city subway casing average thickness of 9.5 meters, the tunnel size of 6.28 × 6.5 m, the axis spacing of 13 m with the excavation of twin tunnels, step method, the footage is in Shenyang 1 m step length of 3-5 meters or so lines staggered 10 meters from the construction is feasible and reasonable, construction methods, and appropriate measures can guarantee the dynamic stability of tunnel construction; reduce each time the excavation of the tunnel construction The footage can significantly reduce the amount of surface subsidence and horizontal displacement of the soil; Shenyang region of watery sand the surface subsidence aspect to the affected area is approximately 5 times the hole diameter, the surface subsidence caused by construction disturbance roughly 30-40mm. Recommended Shenyang tunneling method construction medium span tunnel surface subsidence warning value should be more than 40mm; the proposed tunneling method of Shenyang medium span tunnel construction interval convergence the displacement u convergent than du stability criterion: u = 1.36-14.20 mm, du = 0.22-2.26 ‰.

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