【正文】 迄今已竣工的深基坑工程在 各大城市中可謂比比皆是，不勝枚舉。 關(guān)鍵詞：基坑工程 ,基坑維護,施工 MAINTENANCE DESIGN OF NANJING METRO STATION STRUCTUREABSTRACTFoundation pit engineering is to ensure the foundation pit construction, The main underground safety of structure and the surrounding environment is not damaged and the supporting structure, Rainfall and earth excavation and backfill, including survey, design, construction, monitoring and detection of such a prehensive system engineering. Soil mechanics and foundation engineering foundation pit engineering is a traditional topic, but also a plex geotechnical engineering problems. With the increasingly deep excavation, the area is larger and larger, retaining structure of foundation pit design and construction is getting more and more plex, the need for theory and technology is more and more high.Deep foundation pit engineering relates to structural engineering, geotechnical engineering and environmental engineering and other fields, prehensive high, affected by many factors, design calculation theory is not mature, to a certain extent is also dependent on the experience of Engineering practice.In the first chapter of this article introduces the development condition of deep foundation pit, the design theory research status and key research direction. The second chapter introduced the engineering background and engineering related geological conditions and related parameters of soil layers. The third chapter through analysis of characteristics analysis and maintenance scheme selection principle to determine the engineering of foundation pit supporting scheme. The fourth chapter of foundation pit enclosure structure calculations, including the calculation of soil pressure, supporting structure internal force calculation, maintenance of structural reinforcement calculation, support structure reinforcement calculation etc. The fifth chapter discusses the engineering construction scheme. The sixth chapter briefly discusses on the foundation pit construction quality assurance measures.KEYWORDS: foundation engineering、foundation pit maintenance、construction目錄摘要（中文 ） .......................................................I摘要（外文） .......................................................II1 緒論 ..............................................................1 深基坑工程的發(fā)展?fàn)顩r ..........................................1 深基坑支護設(shè)計理論及計算方法研究現(xiàn)狀 ..........................2 深基坑工程中存在的主要問題及重點研究方向 ......................42 概述 ..............................................................6 工程概況 ......................................................6 氣象 ..........................................................6 地形、地貌、地質(zhì)、水文 ........................................6 工程地質(zhì) ......................................................8 場地巖土工程性質(zhì) ...........................................8 巖土物理力學(xué)性質(zhì) ..........................................103 車站圍護設(shè)計方案 .................................................13 設(shè)計依據(jù) .....................................................13 設(shè)計依據(jù) ..................................................13 設(shè)計原則 ..................................................14 設(shè)計方案選擇 ..............................................144 車站維護結(jié)構(gòu)設(shè)計計算 .............................................16 關(guān)于探測點處斷面設(shè)計 .........................................16 第一道支撐計算 ............................................16 第二道支撐計算 ............................................22 第三道支撐計算 ............................................22 第四道支撐計算 ............................................23 排樁入土深度計算 ..........................................23 最大彎矩計算 ..............................................24 配筋計算 ..................................................26 冠梁計算 ..................................................27 電算結(jié)果 ..................................................275 施工方案 .........................................................46 施工總體步驟 .................................................46 施工總體流程 ..............................................46 施工組織方式 ..............................................46 相鄰攪拌樁施工順序 ...........................................46 施工工藝 ..................................................46 施工質(zhì)量保證技術(shù)組織措施 ..................................47 鉆孔灌注樁施工方案 ...........................................49 鉆孔灌注樁施工工藝 ........................................49 測量放樣 ..................................................51 護筒埋設(shè) ..................................................51 成孔施工 ..................................................51 清孔 ......................................................52 鋼筋籠制作 ................................................52 鋼筋籠安放 ................................................53 水下砼施工 ................................................53 鉆孔灌注樁施工技術(shù)要點 ....................................54 鋼筋混凝土圈梁施工 ...........................................58 土方開挖 .....................................................59 土方開挖 ..................................................59 深井降水施工 .................................................60 工藝流程 ..................................................60 管井施工方法及技術(shù)措施 ....................................60 深井降水停止 ..............................................62 降水注意事項 ..............................................62 井措施 ....................................................626 施工質(zhì)量保證措施 .................................................64 質(zhì)量保證體系 .................................................64 開工前質(zhì)量準(zhǔn)備工作 ...........................................64 施工過程質(zhì)量控制 .............................................65結(jié) 論 ..............................................................68參考文獻 ...........................................................69致謝 ...............................................................701 緒論 深基坑工程的發(fā)展?fàn)顩r自 80 年代以來，我國城市建設(shè)進入了一個新的發(fā)展時期，高層、超高層的建筑越來越多，僅從 1990 年到 2022 年的十年間，我國各大