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中文摘要：
海底隧道不同围岩级别所采用的防排水方式不同。Ⅰ、Ⅱ级围岩采用限量排导的防排水方案，Ⅳ、Ⅴ级较差围岩地段衬砌结构采用全封闭防排水方案。基于扩展有限元法，以厦门海底隧道为例，针对海底隧道不同防排水条件下的衬砌结构开裂情况进行研究，为今后其他高水压水下隧道设计和海底隧道的病害原因分析提供一定的参考价值。研究表明：采用堵水限排的条件下Ⅱ级围岩的衬砌结构未发生衬砌结构开裂，结构设计合理；而采用全封闭防排水结构的 V 级围岩的衬砌结构在低水压条件下拱脚外侧发生纵向开裂，而在高水压条件下衬砌拱脚会同时出现纵向裂缝和压溃破坏。鉴于目前隧道结构开裂主要以环向裂缝为主，且主要集中于拱墙以上部位，所以高水压并不是厦门海底隧道衬砌开裂的主要原因。
英文摘要：
The waterproof and drainage way are not always similar to each other in the different level of surround-ing rock of subsea tunnel,among which the principle of controlled drainage was used in the hard surrounding rock I andⅡ,and the entire plugging method can be applied to the surrounding rock of poor quality,such as the level of Ⅳ and Ⅴ.Based on the XFEM,the actual cracking of Xiamen Subsea Tunnel will be taken in a re-search in different condition of waterproof and drainage,which can be available to provide some useful sugges-tions for the building of other high -pressure tunnels and making cause analysis of lining crack.The research re-sults show that it is not happened to the crack of tunnel lining in the case of controlled drainage of surrounding rock level Ⅱ and the design is reasonable.It also turns out that the outside of arch springing of tunnel lining is cracked in the condition of whole block of surrounding rock level Ⅴ.Both the crushing and cracking of concrete lining will happen under the condition of higher water pressure,which need to be structural reinforced in the rel-evant position of tunnel lining cracks.Besides,based on tunnel lining diseases until now,which mainly are cir-cumferential cracks and located in some parts above the arch wall,it is found that the high water pressure isn’t the main reason of lining cracking of Xiamen subsea tunnel.
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