越江电力地下综合管廊结构横向抗震性能研究

Lateral Seismic Performance of the Utility Tunnel Crossing the Yangzi River

针对越江气体绝缘输电线路(GIL)综合管廊结构的特殊性,考虑内部混凝土支架与盾构隧道的动力相互作用,以及盾构隧道穿越地层的不同,建立了土‑管廊结构非线性动力相互作用的整体计算分析模型,从结构变形、盾构管片张开量、结构地震损伤等方面详细分析了越江GIL综合管廊结构的抗震性能。结果表明:越江GIL管廊结构内部混凝土支架结构明显要先于外部盾构隧道发生地震损伤;当GIL管廊结构穿越相对较软土层时的地震损伤明显加重;受制于内部混凝土支架的约束作用,盾构隧道的下部管片张开量明显小于上部管片计算值,同时外侧残余张开量要明显大于管片内侧残余张开量。

Considering the special design of Gas Insulated Line(GIL),a finite element model was made to simulate the soil-GIL dynamic interaction.The seismic performance of GIL was investigated by analyzing the deformation of structures,the opening of shield segments,and the seismic damage to structures.The results show that the interior concrete support was prone to damage under earthquakes.The shield tunnel of GIL was damaged more seriously when it across soft soils.Meanwhile,due to the constrain of the interior concrete support,the openings of shield segments at the tunnel bottom were smaller than that at the tunnel crown,and the outside permanent openings of shield segments were larger than that in the inside opening of shield segments.