本文選題：復(fù)合地層　切入點(diǎn)：軟弱地層　出處：《北京交通大學(xué)》2014年碩士論文

【摘要】：伴隨著經(jīng)濟(jì)和科技的快速發(fā)展,城市建設(shè)規(guī)模不斷發(fā)展,城市軌道交通網(wǎng)絡(luò)不斷完善,盾構(gòu)隧道技術(shù)具有十分廣闊的應(yīng)用前景。與此同時(shí),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(shì),解決由此帶來的空氣動(dòng)力學(xué)問題需要增大隧道設(shè)計(jì)斷面。不斷完善盾構(gòu)隧道施工的環(huán)境效應(yīng)研究,形成具有自主知識(shí)產(chǎn)權(quán)的Φ7m復(fù)合盾構(gòu)整機(jī)設(shè)計(jì)和制造技術(shù),對(duì)于完善我國(guó)高端設(shè)備制造體系、提升國(guó)際競(jìng)爭(zhēng)力以及我國(guó)的城市軌道交通建設(shè)具有極其重要的意義。 深圳市城市軌道交通11號(hào)線是國(guó)內(nèi)首條設(shè)計(jì)運(yùn)營(yíng)時(shí)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(fù)合地層中7m盾構(gòu)的刀盤適應(yīng)性及施工引起地層變形規(guī)律研究,主要研究?jī)?nèi)容如下： (1)提出復(fù)合地層盾構(gòu)施工的不利地質(zhì)因素的概念,對(duì)依托工程沿線地層進(jìn)行分類并統(tǒng)計(jì)其分布里程；分析不利地質(zhì)因素的工程特性及其對(duì)盾構(gòu)功能設(shè)計(jì)的影響,據(jù)此提出了Φ7m盾構(gòu)的功能設(shè)計(jì)要求,并對(duì)Φ7m復(fù)合盾構(gòu)的關(guān)鍵設(shè)計(jì)參數(shù)進(jìn)行理論計(jì)算；CET6950型盾構(gòu)的性能參數(shù)滿足上述要求,體現(xiàn)了盾構(gòu)機(jī)組的適應(yīng)性； (2)研究了盾構(gòu)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(jié)已有盾構(gòu)刀盤的設(shè)計(jì)經(jīng)驗(yàn)和廣州、深圳復(fù)合地層中盾構(gòu)施工的成功經(jīng)驗(yàn)；據(jù)此,并通過刀盤的力學(xué)特性分析,驗(yàn)證了依托工程的復(fù)合地質(zhì)條件與Φ7m盾構(gòu)刀盤之間的適應(yīng)性；盾構(gòu)始發(fā)段掘進(jìn)參數(shù)進(jìn)一步表明了刀盤的地質(zhì)適應(yīng)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(gòu)隧道掘進(jìn)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(duì)空間關(guān)系三方面,開展隧道上覆軟弱淤泥地層對(duì)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(gòu)隧道掘進(jìn)過程的三維數(shù)值模型,從隧道覆徑比、地層復(fù)合比和隧道間徑比三個(gè)方面,開展復(fù)合地層中盾構(gòu)掘進(jìn)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(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.43

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