近距离双线盾构隧道施工相互影响的监测与分析

上海外高桥电厂是我国目前单机容量最大的火力发电厂，两条取水隧道是二期工程的一个重要项目，但由于其所处地理位置的影响，使得设计上取水隧道之间距离较小，施工过程中必须进行同步监测。文中详细介绍了监测方案的实施过程，分析了隧道内力、隧道断面收敛变形、接触压力等随工程施工的变化规律，保证了取水隧道工程施工的顺利进行。     

软弱围岩隧道施工监控量测及数据处理

在隧道工程施工过程中,监控量测是非常重要的1个环节,其对隧道工程施工质量有比较大的影响。论文以实际工程为例,介绍了软弱围岩隧道施工监控量测的目的,对监控量测的技术进行了探讨,并对监测后数据的处理措施进行了分析。     

隧道通风设备远程监测系统的设计与实现

隧道通风设备是隧道施工过程中的重要设备,工程施工管理过程中要及时了解隧道内的空气质量状况,这就需要以科学的通风设备远程监控系统为基础。本文重点分析了建筑施工隧道通风设备远程监测系统的设计和实现方法,从系统需求分析入手,明确设计原则的同时,提出数据库的构建方法,论证了系统的实现方案。     

隧道工程施工技术管理要点

隧道工程施工技术管理是隧道施工管理中的一项重要内容,对于确保隧道工程施工顺利开展,及隧道工程施工质量合格具有重要的影响。因此,积极开展隧道工程施工技术管理尤为重要,而要想做好隧道工程施工管理工作,必须要明确隧道施工技术管理的要点,才能够抓住重点和关键点,顺利开展技术管理工作。笔者在对隧道工程施工前技术调查管理要点进行介绍的基础上,对隧道洞口工程施工技术管理要点、隧道明洞和洞门施工技术管理要点、隧道开挖施工技术管理要点以及支护施工技术管理要点等隧道工程施工过程中的技术管理要点进行了分析,以期为隧道工程施工技术管理的高效高质开展提供帮助。     

隧道工程施工监测信息管理系统现状及未来趋势分析

近年来,随着城市建设进程的加快,各种因交通道路施工而导致的事故不断出现,其在造成巨大破坏的同时也引起了越来越多人的关注和重视,特别是施工难度相对较大的隧道工程。施工监测信息管理系统是一个以施工监测信息为对象,将知识、决策等融为一体的综合性系统,它以实现建设方主管、工点单位之间的信息互动为设计思想。这种系统不仅可以满足现代社会隧道工程施工快速、准确获得信息的要求,而且还能有效提高工程的管理和技术水平。鉴于此,本文拟从施工监测信息管理系统的功能、隧道工程施工监测信息管理系统的现状以及隧道工程施工监测信息管理系统的未来趋势三个方面进行阐述,以期加深对这一问题的认识与理解程度。     

双圆隧道盾构推进对周围环境影响的现场监测

结合中国第一条双圆隧道工程施工,对双圆隧道盾构推进对周围环境影响的现场监测方法进行了论述.文章以双圆盾构隧道区间施工为实例给出了双圆盾构推进过程中周围土体的变形、土压力、水压力变化的监测方法与测点布置方案,据此监测方案,可以详细监测与分析盾构推进过程中周围土体的地表变形、深层土体变形及土体中的土压力、水压力的变化,从而揭示盾构推进对周围的土体环境的扰动影响规律.     

双圆隧道盾构推进对周围环境影响的现场监测

结合中国第一条双圆隧道工程施工,对双圆隧道盾构推进对周围环境影响的现场监测方法进行了论述.文章以双圆盾构隧道区间施工为实例给出了双圆盾构推进过程中周围土体的变形、土压力、水压力变化的监测方法与测点布置方案,据此监测方案,可以详细监测与分析盾构推进过程中周围土体的地表变形、深层土体变形及土体中的土压力、水压力的变化,从而揭示盾构推进对周围的土体环境的扰动影响规律.     

基于盾构隧道施工监测的动态风险数据库开发

结合盾构隧道施工过程中常用监测项目分析,研究了监测项目表征指标与盾构隧道工程施工中风险事故之间的相互关系,讨论了各监测数据变化特征中潜在的风险事故状态,探讨了导致监测数据异常的相关风险事故及因素.文中以风险因素--监测项目--风险事故为主线,利用数据库系统构建了基于监测信息的动态风险数据库,从而为盾构隧道施工动态风险管理软件提供基础数据支持.     

建筑平移中下方隧道应变测试技术的应用

建筑平移顶升工程中,建筑物经过隧道上方时会对隧道结构产生不利影响。文章基于Winkler模型计算了荷载通过筏板对隧道结构的影响并介绍了一种应用电阻应变片测量隧道结构应变的方法。将该技术应用于天津西站主站楼的平移顶升施工,在工程施工过程中监测了地铁隧道结构应变的变化。     

基坑开挖时对既有隧道监测的时空分析

随着城市市政工程的发展,近接工程施工成为不可避免的难题.根据成府路穿越奥运支线隧道施工过程中对奥运支线的监测数据分析,总结了在上部基坑快速开挖的情况下,下卧既有隧道结构变形的时空分布规律,分析了影响下卧隧道结构变形的主要因素.既有结构变形监测为近接工程的顺利完工提供了有力保障.     

相邻隧道施工对上海地铁二号线的影响分析

上海明珠线东方路车站附近的区间隧道是相邻于地铁二号线的区间隧道建设的，二者中心线间的最小距离为12.3m。由于距离很近，新隧道的施工对原有的地铁二号线隧道的影响不可避免。讨论了在新隧道施工过程中地铁二号线隧道的位移变化规律；研究了新建的盾构隧道的推进对原有隧道的影响特征，并且，给出了存已有隧道附近建设新隧道的规划和施工建议；同时，用数值模拟手段对隧道变形进行了预测，并将预测结果与实测结果进行了比较。     

小间距平行盾构隧道施工的反分析研究

结合北京地铁十号线三元桥站～亮马河站区间盾构隧道工程,提出了根据监测数据对两条盾构隧道小间距、长距离并行施工相互影响进行反分析的方法,并根据工程实施过程中的监测数据,分别对盾构隧道环向和纵向的内力进行了分析,指导了施工。研究表明,当两条盾构隧道小间距、长距离并行施工时,会出现后行盾构隧道对先行隧道先挤压、后卸载的情况,引起先行隧道环向的内力变化,与实际监测的数据吻合。该研究方法及工程实践结论可以为地铁类似工程的设计、施工、监测提供参考。     

Model Test and Numerical Analysis Methods in Tunnel Excavation Problem

Tunnels serve various functions such as in subway systems, underground electric power lines, gas pipes, telecommunication lines, water supplies and sewer lines and many other pipelines. The trend of tunnel construction is toward deeper and longer tunnels. In addition, the excavation of tunnels in difficult ground conditions is now not uncommon, though the tunnels themselves are still difficult to construct. Advanced studying methods have been developed for the prediction, monitoring and evaluation of the performance of tunnels and ground. Today, experimental methods and analytical methods are the main approaches used in tunnel studies. In this paper, the present state of tunnel construction and the main study methods are discussed, and the various experimental and analysis methods and their usage are compared. Tunnel excavation is very complex because it involves soils, structure and interaction problems. There is no one perfect studying method, though there are good combinations of numerical analyses and experimental methods which provide the optimum approach for solving tunnel related problems.     

大断面小净距隧道群爆破施工参数优化研究

以大帽山大断面小净距隧道为工程背景,理论分析、数值计算、设计和监测紧密结合,研究新建隧道爆破施工对邻近既有隧道的振动影响,进而实现对爆破参数的优化.现场监测结果表明,优化后爆破参数设计合理,该爆破设计在现阶段未对既有隧道安全产生较大影响.研究成果可为今后类似隧道工程的爆破施工提供参考借鉴.     

大断面小净距公路隧道现场监测分析研究

针对大断面小净距隧道的特点,对福建省鹤上隧道进行地表下沉、围岩内部位移、洞周收敛、拱顶下沉、围岩压力、衬砌内力等项目的监测工作。基于监测结果,分析该隧道围岩和支护系统的变形及受力特点,指出小净距隧道开挖影响的时空范围和隧道衬砌支护的最佳时机,并为支护体系的优化提供依据。研究结论可为类似条件下工程的设计、施工和监测提供借鉴。     

Field monitoring of a subsea shield tunnel during standpipe lifting

As a subsea construction method, the vertical lifting standpipe has been widely used for the construction of underwater intakes and outlets for hydraulic tunnels since it was applied in China in 1974. During the standpipe construction process with an opening tunnel ceiling, the lifting counter-force will act on the bottom of the tunnel and impact the internal forces and deformations of the close segments and joints of the tunnel. Because of the risk to monitoring personnel and the narrowness of the construction space, there is shortage of field monitoring data to testify or improve the design, and previous work was mainly concentrated on the numerical simulation of vertical lifting construction without field monitoring testification. In this work, the internal stress and joint deformations of the segment during the lifting process were monitored in the standpipe lifting project of the Liuheng power plant hydraulic tunnel and compared with the numerical simulation. The monitoring data figured out the behaviour of the segments and joints during the lifting process and provided a good proof for the rationality of the numerical simulation to improve the design.     

Study of ground-tunnel interactions of four shield tunnels driven in close proximity, in relation to design and construction of parallel shield tunnels

In Japan, K yoto City has constructed four subway tunnels that run closely each other. Problems accompanying the closely running tunnels are studied during the planning and design stages prior to construction. A variety of monitoring during the construction stage resulted in the collection of numerous data including the load transmission between tunnels and characteristic behavior of theground during the construction of four tunnels. Aiming at improving the method for the evaluation of the interaction of closely running tunnels, this study attempted to analyze and assess the behavior of the tunnels and the surrounding ground through such data obtained from the above project. This paper describes the characteristics of influence from the thrust of a succeeding tunnel to a preceding tunnel and the analytical expression of the mechanism of ground behavior during the construction of closely running tunnels.     

Effects of twin tunnels construction beneath existing shield-driven twin tunnels

This paper presents a case of closely spaced twin tunnels excavated beneath other closely spaced existing twin tunnels in Beijing, China. The existing twin tunnels were previously built by the shield method while the new twin tunnels were excavated by the shallow tunnelling method. The settlements of the existing tunnels and the ground surfaces associated with the new tunnels construction were systematically monitored. A superposition method is adopted to describe the settlement profiles of both the existing tunnels and the ground surfaces under the influence of the new twin tunnels construction below. A satisfactory match between the proposed fitting curves and the measured settlement data of both the existing tunnels and the ground surfaces is obtained. As shown in a particular monitoring cross-section, the settlement profile shapes for the existing tunnel and the ground surface are different. The settlement profile of the existing structure displays a “W” shape while the ground surface settlement profile displays a “U” shape. It is also found that due to the flexibility of the segmental lining, the ground losses obtained from the existing tunnel level and the ground surface level in the same monitoring cross-section are nearly the same.     

大断面顶管通道近接穿越下覆既有地铁隧道数值模拟与现场试验

南京某地下步行通道采用非开挖顶管法施工,顶管近距离穿越既有地铁区间隧道及城市主干道。为了保证隧道及主干道安全,施工前建立三维有限元计算模型,模拟施工全过程,预测施工可能引起的隧道及地表变形。根据数值模拟结果提出针对性控制措施,并制定合理的监测方案,分别对隧道竖向位移、水平位移、径向收敛和地表隆沉进行监测。基于监测数据分析隧道及地表变形规律,明确顶管施工期间隧道及地表变形的3个不同发展阶段。研究表明:隧道竖向位移主要表现为隆起,由通道内出土卸荷所引起,工作井基坑开挖对其影响几乎可以忽略;顶管施工过程中,下覆隧道竖向位移先后经历了初始下沉、隆起增强和隆起稳定3个阶段,地表竖向位移先后经历了隆起增强、隆起减弱和沉降3个阶段;同一监测断面内,地表最大沉降位于通道中心轴线上方,距离通道越远沉降越小;采用微欠挖工艺有效控制了隧道最终隆起和地表最终沉降。     

浅埋小净距偏压隧道信息化监测与稳定性分析

我国幅员辽阔,大部分地区以山地丘陵地貌为主,地质条件极其复杂。在高速公路建设中,会遇到大量的隧道工程,而这些隧道由于受到地形、总体线路线型等条件的限制,往往需要修建小净距隧道。本文以横岭底隧道为研究对象,探讨浅埋偏压小净距隧道施工监测技术,为小净距隧道围岩稳定和安全施工提供参考。