特大斷面超淺埋立體換乘車站交叉段暗挖施工技術(shù)研究

1、特大斷面超淺埋立體換乘車站交叉段暗挖施工技術(shù)研究.面隧道開挖過程中核心土巖柱的問題,分別從核心土巖柱的預(yù)留寬度、預(yù)留形狀以及解除步距三方面進行優(yōu)化,確定最適合本工程的方案,即：原方案一的開挖方案,核心土巖柱寬度8米,開挖步距1米,預(yù)留核心土巖柱形狀為曲線形,并成功用于隧道開挖。3.針對交叉隧道交叉口處在隧道開挖過程中出現(xiàn)應(yīng)力集中的問題,對交叉口的初支結(jié)構(gòu)進行優(yōu)化,由數(shù)值分析結(jié)果得到在B斷面雙側(cè)壁導坑貫通后,需要施作雙層初襯,并對拱頂襯砌進行加固,能保證施工安全。4.通過對車站隧道的監(jiān)控量測數(shù)據(jù)處理分析,對隧道的水平收斂、地表沉降、拱部沉降和支護結(jié)構(gòu)受力進行了研究分析,得到了地表、拱頂以及支護結(jié)

2、構(gòu)的數(shù)值變化曲線。  還原【Abstract】 With the rapid development of China's economy and the acceleration of the urbanization process, there are more subways in the urban transport. As a result of urban rail transport system subjected to environmental constraints, it is inevitable to build large-sect

3、ion of shallow tunnel. Particularly in recent years, there is a large number of large-section shallow underground projects in the central area of intensive buildings and heavy traffic density. In addition, a number of large-section shallow tunnels are also building in some passenger lines currently,

4、 Therefore, it is very important to study large-section shallow tunnel.First, monitoring data in the 3rd line Hongqihegou station Tunnel of Chongqing Subway is processed, and then the distribution of excavated rock stress and the large inter-station tunnel stability factors are discussed; and soil e

5、xcavation program in the core pillar of the shape, width, and the lifting step aside from the optimization, then the intersection of the f. irst support structure optimization.By making simulation and analysis to several construction methods for large span and shallow-buried tunnel through MIDAS/GTS

6、 software, optimizes the most appropriate construction method from the surface subsidence, the level of convergence as well as the distribution of plastic zones, etc.; the comparative analysis shows that the numerical simulation is consistent with the monitoring.The contents and the results of the s

7、tudy are as follows:First, list some excavation methods for the Chongqing hongqihegou Station,then select the first two-Side Heading wall arch law excavation program after sonsidering security, time, cost, and other aspects of construction.For large section tunnel excavation process of the core prob

8、lems of soil pillar, respectively, the core of soil from the reserved pillar width, shape, and the lifting step aside from the three aspects of optimization, to determine the most suitable program of this project, namely:the original program one, the core of earth pillar width of 8 meters,1 meter aw

9、ay from the excavation step, the core territory reserved for the curved pillar shape, and successfully used for tunnel excavation.For cross intersection in the tunnel for tunnel excavation process of a stress concentration problem, the structure of the intersection of the first branch is optimized b

10、y the numerical results obtained in the B section Double Side Drift through, the need for facilities for the early double lining, and reinforce the vault lining can ensure construction safety.Tunnel through the Monitoring station data processing and analysis, the level of convergence of the tunnel,

11、surface subsidence, settlement and support the arch structure analysis carried out by force, have been ground, the vault Yiji support structure and the change curve.  還原【關(guān)鍵詞】 特大斷面; 交叉斷面; 開挖方法; 核心土巖柱; 監(jiān)控量測; 數(shù)值模擬 【Key words】 large inter-super-shallow; cross section ; excavation methods; cre

12、soil pillar; monitor and control; numerical simulation【級別】碩士論文【索取全文（WORD版）】Q聯(lián)系Q: 100359168 100459168【目錄】中文摘要 6-7 ABSTRACT 7-8 目錄 8-10 1 緒論 10-18 1.1 問題的提出及研究意義 10-11 問題的提出 10-11 研究意義 11 1.2 工程基本信息 11-13 1.3 工程地質(zhì)情況 13-14 1.4 周邊環(huán)境 14-16 1.5 程特點和難點 16-18 工程特點 16 工程難點 16-18 2 國內(nèi)外研究現(xiàn)狀綜述 18-28 2.1 交叉隧道相關(guān)的

13、理論研究與數(shù)值分析 18-19 2.2 交叉隧道監(jiān)控量測 19-20 2.3 大斷面地鐵隧道開挖方法研究現(xiàn)狀 20-24 2.4 本文的研究內(nèi)容及技術(shù)路線 24-28 研究內(nèi)容 24-25 技術(shù)路線 25-28 3 交叉段B型斷面施工方案優(yōu)化 28-56 3.1 交叉段B斷面開挖備選方案 28-29 3.2 交叉段B斷面開挖方案比選原則 29 3.3 交叉段B斷面開挖方案優(yōu)化比選 29-46 雙側(cè)壁導坑+臺階法 仰拱先做 29-31 雙側(cè)壁導坑+臺階法 仰拱后做 31-33 先拱后墻法施工(上臺階擴大頭) 33-35 先拱后墻法(利用站廳層) 35-37 上下雙側(cè)壁導坑法+整體二次襯砌 37-

14、41 上下雙側(cè)壁導坑+利用站廳層法(或采用臨時鋼支撐) 41-44 上下導坑法+先拱后墻法施工 44-46 3.4 各方案施工進度對比 46-50 3.5 各方案分析匯總 50-53 3.6 本章小結(jié) 53-56 4 B斷面核心土合理尺寸研究 56-78 4.1 引言 56 4.2 核心土巖柱力學特性 56-59 核心土巖柱穩(wěn)定性分析 57-59 核心土巖柱特點 59 4.3 核心土巖柱寬度的優(yōu)化 59-63 數(shù)值分析計算參數(shù)及其計算范圍的確定 60-61 建立數(shù)值分析模型 61 數(shù)值模擬結(jié)果對比分析 61-63 4.4 核心土巖柱形狀優(yōu)化 63-66 方案一優(yōu)化 63-64 方案二優(yōu)化 64

15、-66 小結(jié) 66 4.5 核心土巖柱解除尺寸的優(yōu)化 66-74 建立數(shù)值分析模型 67 數(shù)值模擬結(jié)果對比分析 67-73 小結(jié) 73-74 4.6 監(jiān)控量測結(jié)果 74-76 監(jiān)測數(shù)據(jù)分析 74-76 監(jiān)測結(jié)果與數(shù)值分析比較 76 4.7 本章小結(jié) 76-78 5 交叉口襯砌結(jié)構(gòu)優(yōu)化 78-86 5.1 引言 78 5.2 初期支護的作用原理與破壞模式 78-81 初期支護柔性與寬度的關(guān)系 78-79 粘結(jié)性對初期支護穩(wěn)定性的影響 79-80 噴射混凝土的破壞模式 80-81 5.3 交叉口初支優(yōu)化數(shù)值分析 81-84 計算目的 81-82 計算模型 82 數(shù)值模擬結(jié)果分析 82-84 5.4 本章小結(jié) 84-86 6 特大斷面超淺埋隧道交叉段圍巖穩(wěn)定性分析 86-104 6.1 特大斷面超淺埋隧道交叉段圍巖穩(wěn)定性數(shù)值模擬分析 86-90 計算模型 86-87 計算結(jié)果分析 87-9