钱江隧道顺逆结合法深基坑变形性状实测分析

发布时间：2018-04-14 14:24

本文选题：深基坑 + 富水砂层　；参考：《土木工程学报》2014年08期

【摘要】：以钱江隧道江南盾构试验井基坑为工程背景,分析并对比了钱塘江畔富水砂层中顺逆作结合法基坑和顺作法基坑的变形性状,并与文献中已报道的该地区逆作法基坑的变形性状进行对比。研究结果表明:1顺逆作结合法对基坑围护结构侧移和墙后地表沉降的控制能力介于逆作法和顺作法之间;2顺作法基坑围护结构最大侧移点埋深(Hm)大于顺逆作结合法基坑和逆作法基坑,三种方案的Hm几乎落于开挖面以上8m和开挖面以下7m范围内;3随着开挖深度(He)的增加,顺逆作结合法基坑墙后地表沉降影响范围逐渐增大,顺作法基坑墙后地表沉降形态由梯形逐渐变为凹槽形;4对于墙后地表沉降影响范围,逆作法基坑约为1.5He,顺逆作结合法基坑约为2He,顺作法基坑则为3.5He。
[Abstract]:The Qianjiang tunnel shield test Jiangnan foundation pit engineering background, analysis and comparison of the Qian Tang river water rich sand in the inverse deformation method and practice of foundation pit with characters, deformation characteristics of the area and has been reported in the literature and top-down excavation were compared. The results show that between 1 clockwise for surface subsidence the retaining structure of foundation pit lateral wall and combined method of control ability between reverse and normal; 2 overall approach the maximum lateral displacement of retaining structure point depth (Hm) is larger than the reverse combined based pit and top-down excavation, three schemes of Hm almost fell to the surface above 8m excavation and excavation surface below 7m in the range of 3; with the increase of excavation depth (He), reverse the combined method of foundation pit wall surface settlement influence scope gradually increased and the consequent excavation wall surface subsidence form by trapezoidal groove gradually; 4 for the surface settlement behind the wall The influence range is that the foundation pit of the reverse method is about 1.5He, the foundation pit of the combination method is about 2He, and the foundation pit of the CIS method is 3.5He.

【作者单位】：同济大学;广东省建筑设计研究院;上海建工集团股份有限公司;
【基金】：国家自然科学基金(51078292) 交通部钱江隧道科技项目(2009-353-333-340)
【分类号】：TU473.2;TU433

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