Analysis On Mechanical Mechanism Of Tunnel-Pile Method Construction For Large Span And High Sidewall Metro Ventilation Tunnel

Tunnel-Pile Method Construction is the organic combination of Open-cut Foundation Pit Method and Mining Method. The soils cut under the protection of piles and beam and arc. Compared with the traditional method of shallow tunnel construction which is used in the past, Tunnel-Pile Method Construction is more flexible, and it has a better restriction of Ground surface settlement, so this method satisfies the demand of the complex construction environment in the city, and enjoys a great technological advantage.Taking the Metro Ventilation Tunnel of Jiangtai subway station of Line fourteen as actual background, in this dissertation, Tunnel-Pile Method Construction is researched combined with the Investigation data and FEM calculation. The main works includes:1. Finite-element analysis is taken on both CRD Method and Tunnel-Pile Method Construction to obtain the Ground displacement which is caused by the two methods. Compare the security, the cost of construction, the construction period of the two methods, and choose a reasonable one subsequent.2. Conduct FEM calculation and analysis of the three Secondary-lining Construction sequence of Tunnel-Pile Method Construction to obtain the variation of the Ground displacement and the Top arch lining internal force of the different Secondary-lining Construction sequence, compare the security, the cost of construction, the construction period of the three methods to choose a reasonable one subsequent.3. Calculate and analyze the five Working conditions of the construction process under the circumstances of Tunnel-Pile Inverse method using Load-structure model, and confirm the Adverse Working conditions of the Secondary-lining in the construction.4. Research the variation of the Ground displacement、The initial support of arch and Enclosure piles under the different Pile diameter and Buried depth of the Enclosure piles based on the Tunnel-Pile Inverse method Working condition. Compared the scope of application、construction technology、Inverse method and the construction period of the Bored pile and the artificial hole-digging pile, and choose the appropriate Drilling mode。...