厦门环岛路隧道明洞下穿铁路联络线施工技术

结合厦门环岛路(鳌山路-高殿二号路)工程隧道明洞下穿高崎联络联络Ⅱ线实施方案,分别阐述了临近既有线明洞围护结构施工、铁轨架空加固、基坑开挖及主体结构施做、明洞结构内加固桩处理和沉降控制,该技术对在富水地层条件下明暗挖隧道穿越铁路既有线工程具有普遍的指导意义。     

隧道明暗挖分界面处基坑支护桩施工力学效应

论文以重庆某轻轨车站区间隧道明暗挖工程为例,提出隧道明暗挖分界面处支护桩结构的物理概化模型,采用数值模拟并结合现场监测结果,对隧道明暗挖分界面处基坑支护桩施工力学效应进行研究。分析结果表明:支护桩桩间距、桩截面尺寸、桩截面形状对支护桩力学效应的影响中,桩截面尺寸对支护桩桩身变形及力学效应影响最为显著;隧道洞径、埋深及走向变化对支护桩力学效应的影响中,洞径对支护桩变形影响较大;先开挖隧道后开挖基坑能有效减少坡顶沉降及侧向位移,同时桩身弯矩剪力值也较小;支护桩施工后设置拱形连梁可以有效增强余桩的支护作用。     

浅谈地铁明暗挖交界处进洞施工技术

地铁区间隧道施工中,经常会遇到从明挖基坑中直接进行矿山法隧道进洞的情况,为保证明挖基坑的稳定和矿山法隧道进洞段施工的安全,需要对明暗挖交界处进洞施工技术进行研究。该文以厦门地铁一号线岩车区间为例,采取监测数据进行对比分析,对隧道由明挖转为暗挖时的进洞施工顺序进行了探讨,相关经验可为类似工程提供借鉴。     

试析复杂地形地质条件下隧道进洞施工技术

隧道进洞是对明暗挖衔接部位的施工。隧道洞口的地质条件比较差,岩石松散破碎、风化严重。一旦对其开挖进洞,就会破坏山体的平衡,造成顺层滑动、坍塌等现象发生。因此,隧道洞口成为了施工最困难的地段。在复杂地形地质条件下,洞口倘若埋的深或者浅,不容易成洞,会造成进洞施工更为困难。隧道进洞工程影响到了施工的总工期和工程的运行安全,甚至影响到了洞口周围的铁路和公路正常运营。本文就此通过工程实例,分析了在复杂地形地质条件下隧道进洞的施工技术。对隧道进洞的施工组织措施、施工技术方案进行了具体深入的探析。     

泸州长江输气管道隧道的设计与快速施工技术

根据纳溪至成都天然气输送管道工程泸州长江隧道穿越泥岩和砂质泥岩的工程地质与水文地质条件,并结合输气管道隧道断面小、斜巷坡度大、风险高和建设工期紧的特点,着重开展了小断面水底输气管道隧道的设计与快速施工技术研究.针对泸州长江隧道的结构设计特点和围岩地质状况,研究和采用了"明暗结合,超前探水,控制爆破,喷锚衬砌"的施工总原...     

PBA暗挖车站与盾构隧道重叠施工的影响分析

以北京地铁某线明暗挖结合的地下车站为例,对3种不同的施工工况,采用Ansys程序模拟计算分析了盾构隧道及车站施工对地面沉降的影响及车站与区间隧道的相互影响。计算分析结果表明,采用工况1方案,即盾构在暗挖段上导洞施工完毕,暗挖段顶梁、中柱没有施工的情况下穿越,盾构隧道与车站暗挖结构相互影响较小,施工难度及风险在3种施工工况中最小。     

滇西红层地质隧道施工技术

结合具体工程实例,介绍了滇西红层隧道施工的工程特点、难点及施工方法,提出了在膨胀岩地段进行隧道施工应注意的问题,以确保隧道工程施工质量,积累隧道施工经验。     

铁路隧道工程防水施工技术及其质量控制研究

结合具体的铁路施工工程,详细分析了铁路隧道防水工程施工过程中容易出现的质量问题及其防水原则,深入探究了铁路隧道工程防水施工技术,并提出了具有实效性的铁路隧道工程防水施工质量控制措施,希望能对铁路隧道工程防水施工有所帮助,从而有效保障工程施工质量。     

谈大断面软弱围岩隧道的施工管理

结合工程实例,概述了该区域隧道工程的设计及施工情况,分析了出现施工问题的原因,从施工工法、施工动态、施工队伍等方面,对软弱围岩隧道的施工管理进行了探讨,确保软岩隧道工程的施工质量与安全,有利于高速铁路的发展。     

明月山隧道通风竖井施工技术

结合明月山隧道的工程概况,介绍了该隧道通风竖井施工的设备,详细地阐述了该通风竖井的施工方案及方法,并提出了施工注意事项,从而完善隧道通风竖井施工工艺,积累隧道工程通风竖井的施工经验.     

浅谈铁路隧道洞口及明洞段边坡防护

为确保隧道施工安全和隧道结构稳定,对铁路隧道洞口及明洞段边坡防护进行了探讨,提出了具体的处理措施,指出在实际设计和施工中应针对性的进行隧道洞口及明洞边坡防护,以保证隧道设计“经济”“合理”“安全”“环保”。     

城市浅埋隧道设计与施工方法研究

城市发展过程中,交通与环境的矛盾日益突出,为了保全地面结构物,采用隧道方寨的也越来越多。城市隧道最显著的特征是浅埋、地面结构物复杂、围岩差。文中结合厦门市机场路一期工程梧村山隧道的莲前西路下穿道这一具体工程,在分析现有城市浅埋隧道施工方案的基础上,通过优化施工步骤和支护参数,结合有限元分析计算,验证展线明挖方案和管幕暗挖两种方案都是合理可行的,考虑到投资和施工风险,最终决定采用展线明挖方案。     

浅析明挖隧道抗拔桩设计

通过对常熟青墩塘互通隧道抗拔桩设计过程的分析,介绍了城市明挖隧道抗拔桩的计算及分析方法,以及设计中应考虑的各种因素,以供类似工程参考。     

Numerical investigation of underlying tunnel heave during a new tunnel construction

This paper presents a case study of protecting existing tunnels during the construction of a new cut-and-cover tunnel above in Nanjing, China. Various construction measures, including sequential excavation, jet grouting, and a pile-slab retaining system were performed to control the heave of existing tunnels. Furthermore, a numerical analysis using a finite difference program, FLAC3D, was conducted to investigate the influence of different construction schemes on the tunnel heave. Finally, a comparison between numerical results and field measurements were carried out to study the influence on the tunnel heave from various factors, such as the ground reinforcement depth, excavation sequence, and the skew angle between new tunnel and existing tunnels. The results show that when the excavation volume is small, the uplift values of existing tunnels increase nonlinearly with the increasing excavation width of each step. The pile-slab retaining system combining with ground treatment method can control the tunnel heave within the required limits. The optimum ground treatment scope is about 1.5 times of the excavation depth in this project. Compared to other construction schemes, the tunnel heave will be the smallest under a staggered segmentation excavation method starting from the sides to the center.     

In situ grouting tests for differential settlement treatment of a cut-and-cover metro tunnel in soft soils

Bulletin of Engineering Geology and the Environment - This paper presents three comparative in situ grouting tests for long-term settlement treatment of a cut-and-cover tunnel of Nanjing Metro Line...     

公路隧道明洞结构计算方法

简单介绍了公路隧道明洞结构的建模方式和荷载组合工况及截面验算方法,并结合具体工程实例进行了计算和分析,得出了有益的结论,为工程设计提供了一定指导。     

Ground movements due to the construction of cut-and-cover structures and slurry shield tunnel of the Cairo Metro

This paper presents an evaluation of the settlement prediction techniques used to estimate the surface settlements associated with the construction of the Greater Cairo Metro Line 2. The construction of the Cairo Metro involved the construction of cut-and-cover underground stations and bored tunneling. A typical underground station was executed using top-down construction technique. The twenty two meters excavation was carried inside a watertight box with 50-m-deep diaphragm walls to form the sides and a 7-m thick grouted plug at the bottom. Tunneling was performed using a slurry shield tunnel boring machine, TBM, having an internal diameter of 9.48 m. This analysis is the first step in view of enhancing the procedures of settlement prediction and appraising potential damages to overlying structures and utilities for the future construction of the twin road tunnels in the historical urban environment of Al Azhar area and Khan El Khalily market in Cairo.     

Tunnelling in the Federal Republic of Germany: Analysis for 1985–1986

The author presents the results of a study of tunnelling activity in the Federal Republic of Germany for the years 1985–1986, 1984–1985 and 1983–1984. The study compares six categories of tunnels for each year: underground and commuter railway tunnels; federal railway/long-distance railway tunnels; urban and highway road tunnels; water and other supply tunnels; waste tunnels; and miscellaneous tunnels. Tables and graphs are used to compare overall tunnel drivage length, excavated diameter, means of construction, e.g. mining, cut-and-cover, and placing of contracts as related to excavated volume and drivage length. The author notes that tunnels being constructed as part of the German Federal Railway's program to develop high-speed routes account for the great majority of non-urban traffic tunnel constructions, and that this trend will continue in years to come.     

深汕高速公路101滑坡整治新技术——园安抗滑桩明洞

深汕高速公路101工点滑坡整治所采用的新型抗滑桩结构,双拱两跨,桩锚结合,结构形式新颖,为我国工程界首创。     

Blinding struts — Part 1: Buckling response

The term ‘blinding’ is used to describe the thin layer of unreinforced over-site concrete which is used to protect the base of excavations from construction traffic and to provide a clean surface for the construction of the base slab. Blinding is not generally seen or exploited as a structural element even though it clearly provides some temporary lateral support to the retaining walls of cut-and-cover excavations. This paper shows that enhanced blinding can be used to prop retaining walls in cut-and-cover excavations during construction prior to the completion of the base slab. An experimental program is conducted on 1/4 scale specimens, which demonstrates that the failure load of blinding struts is governed by upheaval buckling, and which is employed for the validation of nonlinear finite element models. The main parameters governing the buckling load are shown to include: i) the amplitude of the geometrical imperfection, ii) the thickness of blinding, and iii) the eccentricity of the applied load with respect to the centroid of the strut.