【摘要】：本課題依托于南京市梅子洲過江通道接線工程-青奧軸線地下交通系統(tǒng)及相關工程,本工程是2014年青奧會的主要配套工程之一,主要由梅子洲過江通道連接線、濱江大道地下交通系統(tǒng)和青奧軸線公園地下空間三部分組成。主線隧道全長1668m;濱江大道隧道線路主線長1258m;梅子洲過江通道主線隧道上方、青奧公園下方設置地下一層大型地下空間,總開發(fā)面積21000m2。項目研究的施工區(qū)域為,梅子洲過江通道連接線J1-J5區(qū)域,其中主線隧道全長1668m,匝道1603m。該區(qū)域主要為條型基坑,最大開挖深度27.5m,最大開挖寬度50m。根據(jù)基坑開挖深度不同,基坑圍護結(jié)構(gòu)分別采用放坡、SMW工法樁、鉆孔樁+三軸攪拌樁(高壓旋噴樁)止水帷幕、地下連續(xù)墻+高壓旋旋噴樁接縫止水等形式。除B2-J1區(qū)有部分基坑圍護結(jié)構(gòu)隔斷了基坑內(nèi)外水力聯(lián)系外,其余均為“懸掛式”圍護結(jié)構(gòu),坑內(nèi)外地下水具有水力聯(lián)系。本項目地處南京市長江沿岸,為南京市梅子洲過江通道一期工程。本工程所在區(qū)域氣候濕潤,雨量充沛,降水時間長,長江等地表水體與地下水的水力聯(lián)系較好,在豐水期對地下水有補給作用;對區(qū)域地下水的形成的補給起重要作用。據(jù)區(qū)域資料以及本次勘察成果,根據(jù)含水層的巖性、埋藏條件和地下水賦存條件、水力特征,可分為松散巖類孔隙水和碎屑巖類孔隙水。松散巖類孔隙水又可分為孔隙潛水和孔隙承壓水。承壓水主要分布于基巖上部松散層中,其沉積物多呈二元或多元結(jié)構(gòu),上細下粗,在長江漫灘區(qū)上覆淤泥質(zhì)土及黏性土,并直接與長江河道區(qū)江水相通。深基坑長期降水條件下周圍建筑物沉降控制技術(shù)研究。參考國內(nèi)外文獻對深基坑施工對周圍建筑物沉降控制的研究,研究了在長江沿岸深基坑施工對周圍建筑物沉降控制理論,研究了分區(qū)降水技術(shù)對周圍建筑物沉降控制效果。并在依托工程中采用的分區(qū)降水技術(shù),超大、深變基坑分區(qū)降水技術(shù)對節(jié)約成本,減少周圍沉降進行了研究。在該類地質(zhì)條件下的深基坑大跨度隧道還沒有類似工程可以借鑒。此次在南京青奧軸線地下工程隧道的應用將填補在長江沿岸深基坑施工中應用的空白,通過此研究為承建同類工程積累寶貴的技術(shù)借鑒和施工經(jīng)驗。本課題的研究即針對南京梅子洲過江通道連接線—青奧軸線地下交通系統(tǒng)建設工程連接線的具體工程問題,又針對該工程處于復雜地質(zhì)條件下應用的建造技術(shù),在綜合國內(nèi)外研究成果的基礎上,通過現(xiàn)場試驗、數(shù)值模擬和理論分析,研究復雜地質(zhì)條件下超大型城市地下樞紐工程各類建造技術(shù)的安全性、可靠性和經(jīng)濟性。為本工程解決實際問題,對超大型城市地下樞紐工程建造技術(shù)的科學性和經(jīng)濟性進行分析,確保安全、經(jīng)濟、可靠地對本工程進行施工的同時,可為今后類似工程提供工程依據(jù)和設計經(jīng)驗,為其進一步在工程中推廣復雜地質(zhì)條件下超大型城市地下樞紐工程建造技術(shù)應用提供實踐和理論依據(jù),具有重大經(jīng)濟和社會效益。
[Abstract]:This project relies on the connection project of the Meizizhou river-crossing passage in Nanjing-the underground transportation system of the Youth Olympic Axis and related projects. This project is one of the main supporting projects of the Youth Olympic Games in 2014. It is mainly composed of the connecting line of the Meizhou river-crossing passage, the underground transportation system of the Binjiang Avenue and the underground space of the Youth Olympic Axis Park. It is 1668 m long; the main line of Binjiang Avenue Tunnel is 1258 m long; a large underground space is set up under Qingao Park above the main line tunnel of Meizhou River Crossing Channel, with a total development area of 21 000 m 2. The construction area studied in this project is the J1-J5 area of the connecting line of Meizhou River Crossing Channel, of which the main line tunnel is 1668 m long and the ramp is 1603 M. The maximum excavation depth is 27.5m and the maximum excavation width is 50m. According to the different excavation depth, the retaining structure of the foundation pit is divided into slope setting, SMW pile, bored pile + triaxial mixing pile (high-pressure jet grouting pile) water-proof curtain, diaphragm wall + high-pressure jet grouting pile joint water-proof and other forms. The project is located along the Yangtze River in Nanjing City. It is the first phase of the Meizhou River Passage in Nanjing City. The area where the project is located is humid climate, abundant rainfall, long precipitation time, and hydraulic connection between surface water and groundwater. It can be divided into pore water of loose rocks and pore water of clastic rocks according to the lithology, burial conditions and occurrence conditions of groundwater and hydraulic characteristics. The confined water mainly distributes in the unconsolidated layer of the upper bedrock. The sediments of the confined water are mostly of binary or multivariate structure, fine and coarse, overlying muddy soil and clay soil in the floodplain area of the Yangtze River, and directly connected with the river water in the Yangtze River channel area. Based on the research on settlement control of surrounding buildings by deep foundation pit construction in domestic and foreign literatures, the theory of settlement control of surrounding buildings by deep foundation pit construction along the Yangtze River is studied, and the effect of zonal dewatering technology on settlement control of surrounding buildings is studied. The application of the tunnel in the underground engineering of Nanjing Qingao Axis will fill the blank in the construction of deep foundation pit along the Yangtze River and accumulate valuable experience for similar projects. The research of this subject is aimed at the concrete engineering problems of the connection line of the underground transportation system construction project of Nanjing Meizizhou River-crossing passage-Qingao Axis, and the construction technology applied in the complex geological conditions, on the basis of synthesizing the research results at home and abroad, through the field test. Numerical simulation and theoretical analysis are used to study the safety, reliability and economy of various construction technologies for super-large urban underground hub projects under complex geological conditions. To solve practical problems in this project, the scientific and economic characteristics of construction technology for super-large urban underground hub projects are analyzed to ensure the safety, economy and reliability of the project. At the same time, the construction can provide engineering basis and design experience for similar projects in the future, and provide practical and theoretical basis for popularizing the construction technology of super-large urban underground hub projects under complex geological conditions, which has great economic and social benefits.
【學位授予單位】：青島理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU753.66;TU433

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