软土地区大型深基坑总体设计与施工方案（论文）.pdf

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l< m左右的基坑可采用两级放坡的方式直接开挖；砂性软土地区的施工场地狭小 时，深度9 m左右的基坑可采用1道竖向钢斜撑结合坑内加固及换撑的支护模式。关键词：软土；深大基坑；竖向钢斜撑；放坡开挖第 满 通 追 本 综TU753.1 文 献 标 志 码 ：A 文 章 编 号 ：1004-1001(2021)03-0337-04 D O I： 10.14144/j.cnki.jzs g.2021.03.001方 数 智 上 真 建建 全 智 ， 提關 供 真 供 同 意 § 供 ， 义上 套 苞 义提§ 供 现 苞 、 智 ! 智 § 互 协 真 上 關 智 全 智 智 慧 面 § 套 供 同 真 义提§ 供 体 提义提供 现 § 互义 现 § 提建 各 上 智 真服 期 服 ， ! 苞 , ! 真1 Z H A N G X u23A )QBPL VLBJNLb ZBaTt .aD,r )Dg etoAm nB_LPm WQLLP(B -34416m )QBPL：0A MDPRSB daUQBtiUt,aLJ YiTBRP —.aD,rF )DAm etoAm WQLPRQLB 0444I0m )QBPLs t a C 4 L 0 C: Taking a deep foundation pit project in soft soil area as the background, the complexity and diversity of the surrounding environment of the project and the difficulties of foundation pit construction are analyzed. This paper discusses the necessity and feasibility of the combined application of various supporting methods for this kind of foundation pit. The research shows that when the foundation pit area is large, the middle basin excavation is adopted, the middle main structure is used as the support fulcrum, and 1-2 vertical steel diagonal bracings are adopted according to the different depth of the pit, which can reduce the support engineering quantity and effectively ensure the stability of the foundation pit. When the construction site is open in sandy soft soil area, the foundation pit with a depth of about 7 meters can be directly excavated by two step-slope. When the construction site in sandy soft soil area is narrow and the depth of foundation pit is about 9 meters, the supporting mode of one vertical steel diagonal bracing combined with pit reinforcement and support replacement can be adopted.! 卷 智第 实 3值 上： soft soil; large deep foundation pit; vertical steel diagonal bracing; step-slope excavation?
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