Evaluation for Mechanical State and Safety of Complicated Structure System in Pile-half Tunnels
HAN Fuqing;HU Xuebing;
In recent years,more and more large- span half- tunnel structures are adopted for highway tunnels. For such structures,there are many construction procedures,distribution of internal force of structures changes greatly,and indices during design and construction are difficult to control. For this purpose,this paper proposes half- tunnel structure safety coefficient method. Dependent on Jiangluo Road Shed- tunnel Project in Guangdong Province,the paper simulates the whole construction progress,and analyzes sectional safety coefficients of all parts in half- tunnel structures in combination with internal force of structures under all working conditions to determine the worst working conditions and distribution of safety coefficients of half- tunnel structures. The results of research show that except for large stress at intersection between baseplate structures and inclined columns of half- tunnel structures, safety coefficients of other parts are larger,and baseplate structures can be optimized; the stress on both ends of inclined columns is the maximal and is greatly affected by construction process; safety coefficients of canted walls and crown plate structures are higher,and structural sections can be further optimized.
【CateGory Index】： U455