中文摘要：

为研究厦门滨海复杂地层环境下，长大深基坑在施工中的稳定性及对周边环境的扰动规律，文章以厦门地铁2号线海沧大道站基坑为背景，通过现场实测，从地下连续墙水平位移、地表沉降和地下水位变化3个方面进行了研究，得出了如下结论：（1）地下连续墙水平位移最大值为24.5mm，约为0.35%倍基坑深度H，略小于其他软土地区水平位移量；（2）地表沉降槽呈现“√”状分布，最大值出现在距基坑边0.5倍基坑深度位置附近，影响范围约为1.76倍基坑深度范围，监测区域地表沉降最大值为22.4mm；（3）滨海地区基坑施工过程中地下水位表现为上下波动的变化，是重点监测项目之一，总体呈现上升的趋势，累积变化量最大约为0.72m；（4）海堤水平位移和沉降变化不稳定，但始终变化幅度很小。文章研究成果对厦门滨海复杂地层环境下类似长大深工程施工具有一定参考价值和指导意义。

英文摘要：

Amoy is a city with complex ground-environment. With the development of science and technology, urban rail transit project gradually becomes a sign of the level of development. In recent years, the construction of urban rail transport projects in the country has emerged in large and medium cities. Metro Line 2 in Amoy was built on January 31^st, 2016. As we all know, excavation not only influences the foundation pit itself, but also is related to the surrounding buildings and structures, as well as the safety of various municipal facilities. The purpose of this paper is to study the stability of long and deep foundation pits in operation and the rule when soil is destabilized by excavating foundation pits. Especially this engineering project is in the complex ground-environment of Amoy coast. By measuring the monitoring data of the foundation pit in Haicang road station of Amoy Metro Line 2,this article conducts the research from three aspects： horizontal displacement of the underground continuous wall, surface subsidence and groundwater level changes. The article concludes that：（1） The maximum horizontal displacement of the underground continuous wall is 24.5mm, about 0.35% of the depth of foundation pit（H）,slightly lesser than the other soft soil area. （2） Surface subsidence trough shows ＂√＂ shape distribution. The maximum appears at a distances of 0.5 times of the foundation pit depth（H） from the pit side, the range of influence is about 1.76 times of the depth of foundation pit. The maximum surface subsidence of monitoring sections is 22.4mm. （3） During the construction of excavation, the groundwater level of coastal areas shows fluctuations as a change in performance, showing a rising trend in whole. The maximum cumulative variation is about 0.72cm. （4） Change of seawall horizontal displacement and sedimentation change is unstable, but always small. For the long and deep foundation pit under the environment of coastal complex formation, the research results have reference va