中文摘要：

近年来临海（江）建设的地下工程逐渐增多,与常规静水补给条件下的基坑工程相比,受波浪、潮汐等动水作用影响的基坑可能展现出不同的性状,对该类水力条件下基坑响应问题的研究具有重要的工程意义。依托港珠澳大桥珠海连接线拱北隧道海域段基坑工程,采用PLAXIS软件对波浪、潮汐作用下重力式挡墙两侧的水土压力、基坑的稳定性进行了探讨分析。结果表明,对于均质砂质地基上的重力式挡墙,当基坑距防波堤一定距离时,波浪对其稳定性的影响可以忽略不计;潮汐在海床和基坑中的传播有滞后效应,当潮汐为最高潮位时,基坑并非处于最危险状态;潮汐作用下临海重力式挡墙基坑的稳定性可以通过拟静水位法近似分析。

英文摘要：

In recent years,there are more and more underground projects constructed by seas or rivers.Compared to the conventional excavation adjacent to static body of water,the excavation subjected to wave and tide wave forces may exhibit different behaviors because of its specific hydraulic conditions.So the research on the response of the excavation under such conditions has important engineering significance.Based on the excavation of the Gongbei tunnel,which is a key project of the Hong Kong-Zhuhai-Macau Bridge located in Lingding Ocean and will be built in the southeast of China soon,the software PLAXIS is adopted to study the effects of wave and tide wave on the distribution of the pore pressures and the earth pressures,and the stability of excavation with gravity retaining wall as well.It is shown that the influence of wave on the stability of excavation with gravity retaining wall in homogeneous sandy ground could be ignored when the distance between the retaining wall and the breakwater wall is large enough.The tide wave propagates into the seabed and the foundation pit with distinct phase lag of pore pressure fluctuation.The excavation is not in the most dangerous state when the tide wave level is the highest,It is also shown that the stability of the excavation subjected to tide wave could be approximately evaluated using pseudo-hydrostatic method.