临海复杂地质条件下深大基坑变形规律分析  

The Study on Deformation Patterns of Deep and Large Foundation Pits Under Complex Geological Conditions in Coastal Areas

作　　者：谭舟 金新凯 熊炎林 Tan Zhou;Jin Xinkai;Xiong Yanlin(China Railway Tunnel Consultants Co.,Ltd.,Guangzhou,China)

机构地区：[1]中铁隧道勘察设计研究院有限公司,广东广州

出　　处：《科学技术创新》2025年第7期96-99,共4页Scientific and Technological Innovation

摘　　要：为研究临海复杂地质条件下,明挖深大基坑工程在开挖过程中的变形规律。本文以某临海基坑工程为背景,通过对基坑东、西两侧不同地质条件下的地表沉降及墙体深层水平位移监测数据进行对比分析,揭示了该类复杂地质条件下的基坑变形规律。结果表明:(1)受地质条件影响,临海复杂地质条件下的基坑与一般基坑的变形规律存在差异,但二者整体的变形趋势存在着相同之处,都可以分为变形快速阶段、变形缓慢阶段和变形稳定阶段三个阶段;(2)基坑东侧软土区域内的地表沉降和墙体深层水平位移的累计值和变化速率均大于西侧原状土地层,表明临海软弱地质条件下的围护结构、周边环境的变形具有更大、更快的特点;(3)基坑东侧地表沉降和墙体深层水平位移监测数据变化达到稳定的时间跨度长于西侧,表明临海软弱地质条件下基坑围护结构变形的时空效应更显著,基坑变形更难控制。To study the deformation patterns of deep and large open-cut foundation pits under complex coastal geological conditions during excavation,this paper uses a coastal foundation pit project as a case study.By comparing and analyzing the monitoring data of surface settlement and deep horizontal displacement of the retaining walls on the east and west sides of the pit,which are under different geological conditions,the deformation patterns of foundation pits in such complex geological settings are revealed.The results indicate that:(1)Due to the influence of geological conditions,the deformation patterns of foundation pits under complex coastal geological conditions differ from those of typical pits,but both show similar overall deformation trends,which can be divided into three stages:rapid deformation,slow deformation,and deformation stabilization.(2)In the soft soil area on the east side of the pit,the cumulative values and rates of change of surface settlement and deep horizontal wall displacement are greater than those on the west side with undisturbed soil,indicating that the retaining structure and surrounding environment under weak coastal geological conditions exhibit more significant and faster deformation.(3)The time span for the stabilization of surface settlement and deep horizontal wall displacement on the east side is longer than that on the west side,suggesting that the temporal and spatial effects of retaining structure deformation are more pronounced under weak coastal geological conditions,making deformation control more difficult.

关 键 词：深大基坑 临海复杂地质 基坑变形 变形监测 

分 类 号：TU47[建筑科学—结构工程]