软土地区狭长型基坑变形及空间效应分析  

Analysis of deformation and spatial effects of narrow foundation pits in soft soil areas

作　　者：吴钰彬 WU Yubin

机构地区：[1]泰国格乐大学,泰国曼谷

出　　处：《福建建设科技》2025年第2期28-31,48,共5页Fujian Construction Science & Technology

摘　　要：基坑开挖是一个复杂的三维空间问题,本文以福州某狭长型深基坑工程为研究对象,通过实测分析和数值模拟对围护结构变形及空间效应进行研究。结果表明:基坑浅层土体开挖对地连墙水平位移影响较小,墙体变形主要发生在工程性质较差的第2层土即淤泥开挖阶段。狭长型地铁基坑存在长边效应,基坑长边地连墙最大水平位移呈现出长边中点处最大,靠近端部位置水平位移值逐渐变小的现象。淤泥质软土地层狭长型地铁基坑中部长边效应表现的并不十分明显,软土基坑中部可以近似为平面应变问题分析。地连墙水平位移分布具有明显的坑角效应,越靠近坑角处地连墙最大水平位移越小,最大水平位移发生在基坑长边中点处。坑角效应影响范围约为2.95H,主要影响区域为0~1.46H。Excavation of foundation pit is a complex three-dimensional spatial problem.This article takes a narrow deep foundation pit project in Fuzhou as the research object,and studies the deformation and spatial effects of the retaining structure through actual measurement analysis and numerical simulation.The results show that the excavation of shallow soil in the foundation pit has a relatively small impact on the horizontal displacement of the diaphragm wall,and the deformation of the wall mainly occurs during the excavation stage of the second layer of soil with poor engineering properties,namely silt.There is a long side effect in the narrow subway foundation pit,and the maximum horizontal displacement of the long side connecting wall of the foundation pit shows that it is the largest at the midpoint of the long side,and the horizontal displacement value gradually decreases near the end position.The long side effect in the middle of a narrow subway foundation pit in a soft soil layer of silt is not very obvious,and the middle of the soft soil foundation pit can be analyzed as an approximate plane strain problem.The horizontal displacement distribution of the diaphragm wall has a significant pit angle effect,with the maximum horizontal displacement of the diaphragm wall decreasing closer to the pit angle,and the maximum horizontal displacement occurring at the midpoint of the long side of the foundation pit.The impact range of the pit corner effect is about 2.95H,with the main affected area being 0-1.46H.

关 键 词：淤泥软土 狭长型基坑 地下连续墙 空间效应 

分 类 号：TU753[建筑科学—建筑技术科学]