水位波动对临海重力式挡墙基坑稳定性的影响  

Effect of water level fluctuation on stability of excavation with gravity retaining wall by the sea

作　　者：应宏伟[1,2] 聂文峰[1,2] 王啟铜 程勇[4] 

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058 [2]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [3]港珠澳大桥珠海侧接线项目管理处,广东中山528467 [4]中交第二公路勘察设计研究院有限公司,湖北武汉430056

出　　处：《海洋工程》2013年第4期48-54,共7页The Ocean Engineering

基　　金：国家自然科学基金资助项目(51278462);浙江省重点创新团队支持计划资助项目(2009R50050)

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。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-Macao 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.

关 键 词：水位波动 重力式挡墙基坑 孔压 土压力 稳定性 

分 类 号：TV139.2[水利工程—水力学及河流动力学] TV861