本文選題：復合地層　切入點：軟弱地層　出處：《北京交通大學》2014年碩士論文

【摘要】：伴隨著經濟和科技的快速發(fā)展,城市建設規(guī)模不斷發(fā)展,城市軌道交通網絡不斷完善,盾構隧道技術具有十分廣闊的應用前景。與此同時,為了提高乘車舒適度,列車提速成為軌道交通的發(fā)展趨勢,解決由此帶來的空氣動力學問題需要增大隧道設計斷面。不斷完善盾構隧道施工的環(huán)境效應研究,形成具有自主知識產權的Φ7m復合盾構整機設計和制造技術,對于完善我國高端設備制造體系、提升國際競爭力以及我國的城市軌道交通建設具有極其重要的意義。 深圳市城市軌道交通11號線是國內首條設計運營時速為120km/h的地鐵線路,本文依托其車公廟站～紅樹灣站區(qū)間隧道工程,開展復合地層中7m盾構的刀盤適應性及施工引起地層變形規(guī)律研究,主要研究內容如下： (1)提出復合地層盾構施工的不利地質因素的概念,對依托工程沿線地層進行分類并統(tǒng)計其分布里程；分析不利地質因素的工程特性及其對盾構功能設計的影響,據此提出了Φ7m盾構的功能設計要求,并對Φ7m復合盾構的關鍵設計參數(shù)進行理論計算；CET6950型盾構的性能參數(shù)滿足上述要求,體現(xiàn)了盾構機組的適應性； (2)研究了盾構刀盤及刀具的類型、適用范圍、工作原理和刀具布置規(guī)律,并總結已有盾構刀盤的設計經驗和廣州、深圳復合地層中盾構施工的成功經驗；據此,并通過刀盤的力學特性分析,驗證了依托工程的復合地質條件與Φ7m盾構刀盤之間的適應性；盾構始發(fā)段掘進參數(shù)進一步表明了刀盤的地質適應性； (3)基于Peck公式,研究沉降槽寬度系數(shù)的確定方法；基于數(shù)值模擬方法,建立模擬單孔盾構隧道掘進施工的三維數(shù)值模型,從隧道上覆軟弱淤泥地層的分布深度、分布厚度及其與隧道的相對空間關系三方面,開展隧道上覆軟弱淤泥地層對地表沉降的影響研究； (4)基于數(shù)值模擬方法,建立模擬雙孔盾構隧道掘進過程的三維數(shù)值模型,從隧道覆徑比、地層復合比和隧道間徑比三個方面,開展復合地層中盾構掘進引起的地表沉降研究。
[Abstract]:With the rapid development of economy, science and technology, the scale of urban construction is continuously developing, and the urban rail transit network is constantly improving. The shield tunneling technology has a very broad application prospect. At the same time, in order to improve the ride comfort, Increasing train speed has become the development trend of rail transit. To solve the aerodynamics problem caused by it, it is necessary to enlarge the section of tunnel design and improve the environmental effect of shield tunnel construction. The design and manufacturing technology of 桅 7m composite shield machine with independent intellectual property rights is of great significance to improve the manufacturing system of high-end equipment in China, enhance the international competitiveness and the construction of urban rail transit in China. Shenzhen Urban Rail Transit Line 11 is the first subway line designed and operated at 120km/h per hour in China. This paper relies on the tunnel project between Chegongmiao Station and Hongshu Bay Station. In this paper, the adaptability of cutter head of 7m shield in composite strata and the regularity of formation deformation caused by construction are studied. The main research contents are as follows:. 1) putting forward the concept of unfavorable geological factors in shield construction of composite strata, classifying the strata along the relying engineering and counting their distribution mileage, analyzing the engineering characteristics of the unfavorable geological factors and their influence on the design of shield function. According to this, the functional design requirements of 桅 7m shield machine are put forward, and the key design parameters of 桅 7m composite shield machine are calculated theoretically, and the performance parameters of CET6950 shield machine meet the above requirements, which reflects the adaptability of shield machine set. 2) the types, applicable range, working principle and tool arrangement of shield cutter head and cutter are studied, and the design experience of shield cutter head and the successful experience of shield construction in Guangzhou and Shenzhen composite strata are summarized. Through the analysis of the mechanical characteristics of the cutter head, the adaptability between the composite geological conditions of the supporting engineering and the 桅 7m shield cutter head is verified, and the driving parameters of the starting section of the shield machine further indicate the geological adaptability of the cutter head. (3) based on Peck formula, the method of determining the width coefficient of settlement trough is studied, and based on the numerical simulation method, a three-dimensional numerical model is established to simulate the tunneling construction of single-hole shield tunneling, and the distribution depth of the soft silt layer overlying the tunnel is established. The influence of the soft silt strata on the surface subsidence is studied in three aspects of the distribution thickness and the relative spatial relationship between the distribution thickness and the tunnel. 4) based on the numerical simulation method, a three-dimensional numerical model is established to simulate the tunneling process of double-hole shield tunneling. The ground subsidence caused by shield tunneling in composite strata is studied from three aspects: tunnel overpass diameter ratio, stratum composite ratio and inter-tunnel diameter ratio.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U455.43

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本文編號：1667034