Abstract:The subsea tunnel engineering that lies at Jiaozhou Bay in Qingdao is introduced,as well as the research status of little distance parallel tunnels in China. The section ZK5+607 which is located in the fault f3–1 is chosen as a typical cross section,and a three-dimensional model(215.0 m×86.1 m×100.0 m) for numerical analysis is established according to geometrical parameters and geological information of the typical cross section. The concrete lining is considered while the rigid arch is converted into concrete lining through a equivalent mode. 12 construction schemes are constituted according to the space temporal relationship between construction steps,the excavating method,the length of drivage cycle,the space distance among each working face and the overburden thickness of each tunnel. Then these schemes are simulated with FLAC3D program. The spacial curves of vault sinkage values after working faces for a given scheme are studied,and some conclusions and suggestions which will benefit construction and survey are obtained. By analyzing vault sinkage values of working faces,the maximum principal stresses in concrete lining,as well as the disturbance of neighborhood tunnels and volumes of plastic zones,the reasonable scheme is chosen. The rationality of recommendatory thickness of overburden is validated via contrasting five cases of overburden thickness. Eventually,in order to definitude the positions of the maximal construction interaction cross section that should be concerned in construction and monitoring,displacements of key points along the ministrant tunnel and distributing of major pricinple stress are given.
蔚立元,李术才,徐帮树. 青岛小间距海底隧道施工优化的有限差分分析[J]. 岩石力学与工程学报, 2009, 28(S2): 3564-3570.
YU Liyuan,LI Shucai,XU Bangshu. FINITE DIFFERENCE ANALYSIS FOR CONSTRUCTION OPTIMIZATION OF LITTLE DISTANCE SUBSEA TUNNELS IN QINGDAO CITY . , 2009, 28(S2): 3564-3570.