复合地层φ7m盾构的刀盘适应性及施工引起地层变形规律分析

发布时间：2018-03-26 07:44

本文选题：复合地层　切入点：软弱地层　出处：《北京交通大学》2014年硕士论文

【摘要】：伴随着经济和科技的快速发展,城市建设规模不断发展,城市轨道交通网络不断完善,盾构隧道技术具有十分广阔的应用前景。与此同时,为了提高乘车舒适度,列车提速成为轨道交通的发展趋势,解决由此带来的空气动力学问题需要增大隧道设计断面。不断完善盾构隧道施工的环境效应研究,形成具有自主知识产权的Φ7m复合盾构整机设计和制造技术,对于完善我国高端设备制造体系、提升国际竞争力以及我国的城市轨道交通建设具有极其重要的意义。深圳市城市轨道交通11号线是国内首条设计运营时速为120km/h的地铁线路,本文依托其车公庙站～红树湾站区间隧道工程,开展复合地层中7m盾构的刀盘适应性及施工引起地层变形规律研究,主要研究内容如下： (1)提出复合地层盾构施工的不利地质因素的概念,对依托工程沿线地层进行分类并统计其分布里程；分析不利地质因素的工程特性及其对盾构功能设计的影响,据此提出了Φ7m盾构的功能设计要求,并对Φ7m复合盾构的关键设计参数进行理论计算；CET6950型盾构的性能参数满足上述要求,体现了盾构机组的适应性； (2)研究了盾构刀盘及刀具的类型、适用范围、工作原理和刀具布置规律,并总结已有盾构刀盘的设计经验和广州、深圳复合地层中盾构施工的成功经验；据此,并通过刀盘的力学特性分析,验证了依托工程的复合地质条件与Φ7m盾构刀盘之间的适应性；盾构始发段掘进参数进一步表明了刀盘的地质适应性； (3)基于Peck公式,研究沉降槽宽度系数的确定方法；基于数值模拟方法,建立模拟单孔盾构隧道掘进施工的三维数值模型,从隧道上覆软弱淤泥地层的分布深度、分布厚度及其与隧道的相对空间关系三方面,开展隧道上覆软弱淤泥地层对地表沉降的影响研究； (4)基于数值模拟方法,建立模拟双孔盾构隧道掘进过程的三维数值模型,从隧道覆径比、地层复合比和隧道间径比三个方面,开展复合地层中盾构掘进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.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43

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