湛江湾跨海隧道工程盾构工作井结构设计及应力分析

湛江湾海底隧道盾构的工作井地面至基底开挖最大深度约47m，开挖深度较深，深挖竖井结构深埋于全水头砂层中，围护结构主要由连续墙及变截面的内衬组成，本文主要分析竖井工程的结构及应力设计，连续墙及内村受力较为复杂，需考虑坑底流沙地质及工作井内外侧水头差较大对基坑支护稳定性的影响，采用封底+减压井方案在坑内设置减压井，通过一系列的井口把水引出排走，既安全又经济，其经验可为今后沿海高水头深挖竖井的设计提供参考.

英文摘要:

The maximum excavation depth from the ground to the base of the working well of Zhanjiang Bay subsea tunnel shield is about 47m，and the excavation depth is relatively deep.The deep-dug shaft structure is deeply buried in the full-head sand layer.The enclosure structure mainly consists of continuous wall and variable cross-section lining.This paper mainly analyzes the structure and stress design of the shaft project.The stress on the continuous wall and the inner village is relatively complex.It is necessary to consider the influence of quicksand geology at the bottom of the pit and large head difference between the inner and outer sides of the working well on the stability of foundation pit support.It is safe and economical to install relief wells in the pit by adopting the scheme of back sealing-relief wells，and drain water out through a series of wellhead.The experience can provide a reference for the design of deep excavation shafts with high water head along the coast in the future.

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