为有效解决汕头市苏埃通道工程遇到的海底硬岩、孤石群及高烈度抗震等技术难题，从海底隧道横断面、平面及纵断面方案进行研究。主要研究和结论如下： 1）对两管方案与三管方案进行比较，在海底硬岩处理方面，2种方案施工风险无本质区别，但两管方案可利用车道板下空间解决消防防灾问题、取消隧道联络通道设置、降低施工及抗震风险，优于三管方案； 2）从抗震、工程造价、结构受力及隧道运维等方面进行研究，发现盾构管片采用单层预制结构优于管片内置二次衬砌结构； 3）隧道平面方案需摸清海底硬岩及孤石群分布范围，结合码头、港池及锚地等控制因素综合确定； 4）隧道纵断面方案的确定，需充分考虑海底硬岩、孤石分布规律以及最小覆土、主航道规划标高、港池范围等控制因素，避开硬岩及孤石群，以减小隧道修建难度和风险。

In order to solve the technical problems that Shantou Su′ai Tunnel encounters, i.e. seabed hard rock, boulder group, high seismic fortification intensity， etc.〖KG-*3〗, a deep study focusing on the crosssectional, plan and longitudinal profile design schemes is made. Some conclusions are drawn as follows: (1) Comparison is made between twintube and tripletube scheme, which shows no essential distinction in terms of seabed hard rock; while twintube scheme is superior to tripletube scheme in terms of firefighting, connection gallery and construction and seismic resistance risk. (2) The study of seismic resistance, cost, structural force and tunnel operation and maintenance shows that shield segment with singlelayered precast structure is superior to that with builtin secondary lining structure. (3) The seabed hard rock and boulder group conditions, dock, harbor, anchorage, etc. should be surveyed before tunnel plan design scheme determination. (4) The seabed hard rock and boulder group conditions, minimum cover soil, planed elevation of main channel, harbor, etc. should be surveyed before tunnel longitudinal profile design scheme determination to reduce construction difficulty and risk.