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论文题目：盾构隧道管片内力分布特性数值模拟分析
ABSTRACT: In recent years, a lot of tunnel projects were built in the world greatly promote thetechnology of shield tunnel, and the fixed methods are forming in most country about thedesign of shield tunnel segment structure. But there are no definite rules about the computingmodels or computing methods of load on deferent soil, so many numerical methods are springup about tunnel and underground project.
In this paper, taking a shield tunnel in Shenyang Metro as an example, three internalforce computing methods of shield tunnel are reviewed and analyzed. A new load-structuremodel of calculating the segment internal force is proposed based on earth pressurecalculation method in soil mechanics. Analyzing the factor of segment internal force, such asthe different joint type, tunnel depth, the diameter of segment, the elasticity modulus andPoisson's ratio of soil. The distributions of internal forces on segments are simulated by usingfinite element method while the ground stress release rates induced from shield tunneling areconsidered. The practical ground stress release rate of a tunnel is determined by comparingsettlements computed by finite element method with in-situ observed data. The numericalsimulation shows that the maximum settlement of ground surface is proportional to groundstress release rate. Based on plane assumption of beam in bending state in material mechanics,the analytical expressions of bending moment allocations on double-layer linings of shieldtunnel are deduced. Two examples for double-layer linings of shield tunnel are numericallysimulated with FEM in order to compute moment allocation ratio. Analytical solutions forallocation ratio of bending moments agree well with numerically simulations. Analyzing therelationship between the first lining and second lining; Analyzing the influence of internalforce on shield tunnel segment by soil relaxation pressure on the example subsea tunnel ofQIONGZHOU strait with high water pressure and great depth.
Key Words: Shield Tunnel segment; internal forces; ground stress release ratedouble-layer linings; soil relaxation pressure.
