Sheltering effect of existing subsurface structures on displacement of retaining wall of foundation pits
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摘要: 城市发展使得基坑工程周边环境越来越复杂,既有地下结构物的保护问题已经引起很多工程界人士的重视,但是既有结构物的存在也同样改变了基坑位移场,因此,在基坑开挖过程中应引起重视,正确认识地下建筑物对位移场的遮拦作用对基坑支护设计时确定基坑的保护等级、施工过程中保护临近已建地铁车站及周围建筑的安全显然具有重要的意义。通过机理分析,结合敏感性理论,发现既有地下结构对基坑水平位移的遮拦效应明显,特别是当地下建筑物与基坑围护墙间距在0.5H时,遮拦作用最为明显,而当距离大于2H后,遮拦效应可以忽略。Abstract: The urban development makes the surrounding environment more and more complex, and a lot of people pay their attention to protect the existing underground structures. However, the existence of the existing underground structures changes the displacement field. Therefore, the excavation process should be highlighted, and it is of great significance to correctly understand the sheltering effect of underground buildings on displacement field for determining the protection class of foundation pits for their supporting design and for protecting the safety of nearby metro stations and the surrounding buildings during the construction. Combining the sensitivity theory with the mechanism analysis, it is found that the sheltering effect is the most obvious when the spacing between the underground buildings and the retaining wall of foundation pits is 0.5H, and it can be ignored when the distance is more than 2H.
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Keywords:
- foundation pit /
- displacement field /
- underground building
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