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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。
In order to study the stability of Xiamen-Dalian deep-foundation pit under construction and its disturbance to the surrounding environment in Xiamen coastal complex strata environment, taking the foundation pit of Haicang Avenue Station of Xiamen Metro Line 2 as the background, The horizontal displacement of continuous wall, surface subsidence and groundwater level changes were studied. The conclusions are as follows: (1) The maximum horizontal displacement of diaphragm wall is 24.5mm, which is about 0.35% times the depth of pit, slightly less than Horizontal displacement of other soft soil areas; (2) The surface subsidence trenches are distributed in a “√” shape with the maximum occurring at a depth of 0.5 times the depth of the foundation pit, with an impact range of about 1.76 times the depth of the foundation pit. The maximum value of surface subsidence in the monitoring area is 22.4mm; (3) The groundwater table in the coastal area during the construction process is fluctuating up and down, which is one of the key monitoring items, showing an overall upward trend. The cumulative change is about 0.72m ; (4) The horizontal displacement and settlement of the seawall are not stable, but the variation range is always small. The research results of the article have certain reference value and guiding significance to the construction of similar deep and deep engineering under the complex coastal environment in Xiamen.