The Stability Analysis Of Ventilating Shaft Of Cross-ocean Tunnel And The Construction Problems Discussion

Because ventilating requirement of cross-ocean tunnel, expecially long distancecross-ocean tunnel, ventilating shaft should be set at sea. The existing ventilatingshafts are all build depend on artificial island, this method not only consumes muchcapital but also is irrational in technology. As result, ventilating shaft to stand byitself is adopt in this paper.Summarizing the existed experiences, this paper discusses the key techniquedifficulties of ventilating shaft building for cross-ocean tunnel and design thestructure form of shaft. The offshore construction problem of ventilated shaft tostand by itself is mainly introduced in this paper and shaft is suggested to sectionalprecast. When shaft sink at sea, we suggest set special auxiliary aquipment.Ventilating shaft standing at sea is effected by much load, and exist muchmechanics problems. This paper reduces loads and mainly considers wave load,static water load, hydrodynamic load and wind load and analyses the stability issueof shaft at sea by structural mechanics method.This paper also elaborates the theory of finite element of shaft-base structureand set up space finite element model of shaft-base structure based on the theory.Using the finite element analysis software ANSYS, stress and deformation ofshaft-base model are solved. Base on the result, this paper analysis the subgradereaction and comes to the conclution that the shaft can stable by itself at sea.