杭州萧山国际机场三期结构列车振动影响研究

铁路的运行振动对结构物以及站内旅客舒适度的影响不可忽视.采用有限元计算方法,推导了传统三维黏弹性边界的等效三维六面体单元,并对列车振动对杭州萧山国际机场三期结构的影响进行了研究.得到了列车通过时的航站楼最大振动速度值,相关结果满足结构振动响应安全性的要求,验证了结构设计的合理性. Abstract：The influence of the running vibration of the railway on both the structure and the comfort of the passengers in the station cannot be ignored.The equivalent three-dimensional hexahedron element of the traditional three-dimensional viscoelastic boundary is derived by using the finite element method,and the influence of train vibration on the structure of Hangzhou Xiaoshan International Airport(Phase III)is studied.The maximum vibration velocity of the terminal building when a train passes through is obtained.The relevant results not only meet the requirements for the safety of structural vibration response but also verify the rationality of the structural design.

《施工技术（中英文）》| 2024年01期

停车场出入场线暗挖区间施工技术

以某市环园中路停车场出入场线项目为背景,在停车场出入场线暗挖区间施工中,通过分析工程难点,采用杂填土层注浆加固、超前大管棚、暗挖区间矿山法、二次衬砌以及地基处理等关键技术,成功克服了杂填土段开挖和下穿商场等难题.工程实践结果表明,该施工方案高效、安全、可控. Abstract：Based on the project of the entrance and exit line of the parking lot of the Middle Huanyuan Road in a city and by analyzing the engineering difficulties,the key technologies such as grouting reinforcement of the layer of miscellaneous soil,advanced large pipe roof,mining method of the underground excavation interval,secondary lining,foundation treatment.were adopted in the construction of the underground excavation section of the entrance and exit line of the parking lot.And the excavation of the miscellaneous fill section and the underpass of the shopping mall were successfully fulfilled.The engineering practice results show that this construction scheme is efficient,safe and controllable

《施工技术（中英文）》| 2024年01期

盾构通过后隧道风井暗挖施工技术研究

北京地铁 17 号线区间隧道采用盾构先行通过后横向暗挖风道的施工工艺,上层风道跨越盾构隧道开挖至端墙,下层风道开挖临近至盾构隧道.在上层风道二衬结构保护下,采用倒挂井壁法开挖盾构隧道两侧土体,施工竖井二衬,保留盾构隧道范围内的下层风道侧墙及底板不施工,以保证后期施工安全.通过风道中板预留吊装孔,对管片逐环拆除,然后施工盾构隧道范围内的下层风道侧墙及底板.风道横向暗挖之前,为防止盾构隧道变形,减小地表沉降,需先对风道范围之外的管片采取径向注浆、纵向拉紧、设置环向支撑等加固措施.因需要进行多次受力转换,采用荷载-结构法对二衬结构进行各阶段内力分析.采用地层-结构法对开挖风道、竖井、拆除管片进行各阶段变形及应力分析,结果表明,地表沉降满足要求.监测结果反映地表沉降达到 99.1mm,主要原因为竖井开挖到底后,因遇到承压水,未及时封底,导致支... Abstract：The interval tunnel of Beijing Metro Line 17 adopted the construction technology of a shield first passing through and then transversely excavating the air duct.The upper air duct was excavated across the shield tunnel to the end wall,and the lower air duct was excavated adjacent to the shield tunnel.Under the protection of the secondary lining structure of the upper air duct,the soil on both sides of the shield tunnel was excavated by the inverted shaft wall,the secondary lining of the shaft was constructed,and the side wall and bottom plate of the lower air duct within the scope of the shield tunnel were not constructed to ensure the safety of the later construction.The hoisting holes were reserved throug...

《施工技术（中英文）》| 2024年01期

邻近寺庙群高海拔隧道钻爆施工关键技术研究

为解决同赛高速隧道施工中振动风险高、作业面不足、洞身超挖的问题,自主研究开发爆破风险识别程序,基于地质背景与施工条件,采用现场试验、数值模拟、工程实测等方式,开展隧道钻爆布孔形式、装药结构、轮廓线等技术参数优化研究.现场实践表明:通过应用研发振动风险识别程序,可大幅度提高现场振动风险识别、动态控制能力,有效避免了敏感人群、建筑群受扰动风险;依据现场有效作业面设大倾角掏槽布孔,辅以扩槽孔、拱顶单排下压孔等措施,在满足掏槽、破岩要求的前提下达到了提升工效的预期;采用优化周边孔装药结构、收紧拱顶轮廓线等措施,有效降低了洞身排险后超挖量,现场初支喷混超方量由 200%降低至 100%以内,同时每循环节省药量约20kg,经济效益显著. Abstract：To solve the problems of high vibration risk,insufficient working surface and over-excavation in the construction of the Tongren-Saierlong Expressway Tunnel,the blasting risk identification program is independently developed.Based on the geological background and construction conditions,field tests,numerical simulation,engineering measurement.were adopted to carry out the optimization of technical parameters such as tunnel drilling and blasting hole layout,charge structure and contour line.The field practice shows that the application of the developed vibration risk identification program can greatly improve the ability of vibration risk identification and dynamic control and effectively...

《施工技术（中英文）》| 2024年01期

盾构隧道下穿多股铁路影响分析

地铁盾构隧道近距离下穿铁路施工时,地层扰动会引起上部既有铁路路基沉降及轨道结构的不平顺,对铁路运营安全产生不利影响.为探讨盾构下穿铁路施工对轨道结构的影响规律,结合某地铁区间盾构隧道下穿胶济铁路施工案例,建立考虑盾构隧道-围岩-路基相互作用的数值模型,分析盾构施工过程中铁路路基沉降及多股轨道的变形特征.结果表明:盾构施工引起路基沉降及轨道变形与铁路之间的距离有关,当盾构施工处于铁路正下方时,路基沉降及轨道的变形最大,且路基的最大沉降为 3.30mm,轨面的最大高低不平顺和最大水平不平顺分别为0.097 5mm和 3.615mm,路基沉降与铁轨变形均处于控制标准范围之内. Abstract：When a subway shield tunnel crosses underneath a railway at a close distance,the strata disturbance will cause the settlement of the upper existing railway subgrade and the irregularity of the track structure,which will adversely affect the safety of railway operation.To explore the influence law of shield tunneling crossing underneath railway construction on track structure,a numerical model considering the interaction of shield tunnel-surrounding rock-subgrade was established in combination with a construction case of a shield tunnel crossing underneath the Qingdao-Jinan Railway in a subway section.The settlement of railway subgrade and the deformation characteristics of multiple tracks during shi...

《施工技术（中英文）》| 2024年01期

断层破碎带及浅埋破碎地层TBM掘进施工技术研究

断层破碎带会严重影响地铁隧道掘进过程中的安全及掘进效率,如果处理不当有可能诱发涌水、塌方等一系列安全事故.以青岛地铁 1 号线为研究背景,分析地铁隧道穿越断层破碎带及浅埋破碎带地层的特点.针对盾构掘进穿越深部断层破碎带的问题,采用地表深孔预注浆加固断层破碎带再掘进的方法,并进行了注浆钻孔设计,同时优化了注浆材料、注浆工艺以及相关注浆参数.对于浅层破碎带地层则采用优化TBM掘进参数并直接掘进施工的方法,成功实现了不良地层下的TBM安全掘进施工. Abstract：The fault fracture zone will seriously affect the safety and tunneling efficiency of the subway tunnel excavation process.It may induce a series of safety accidents,such as water gushing and collapse,if it is not handled properly.Taking Qingdao Metro Line 1 as the research background,the characteristics of subway tunnel crossing fault fracture zones and shallow buried fracture zones were analyzed.The method of surface deep hole pre-grouting to reinforce the fault fracture zone is adopted,and the grouting borehole design is carried out in accordance with the problem of shield tunneling through the deep fault fracture zone.Meanwhile,the grouting material,grouting process and related grouting par..

《施工技术（中英文）》| 2024年01期

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基于皮尔逊相关系数法的盾构掘进参数对地表沉降影响分析

为研究盾构掘进参数对地表沉降的影响,结合北京地铁 19 号线某盾构工程的现场监测结果,运用皮尔逊相关系数法对盾构掘进参数对地表沉降影响进行线性回归的相关性分析,检验了线性相关的显著性水平,并针对盾构掘进参数的波动范围和造成的地表沉降规律进行统计分析,继而通过控制参数来实现地表沉降的精细化控制.结果表明:皮尔逊相关系数法在本工程中应用是可靠的,影响地表沉降的两个关键控制参数为同步注浆量、土压力,相关系数分别为 0.52 和 0.41,其他参数与地表沉降表现为极弱相关;右线盾构的掘进参数较左线进行了更加精细化的控制,最优参数控制范围为平均值 95%置信区间,最终使右线上方地表沉降较左线大幅度减小,稳定在6mm以内,通过参数精细化控制取得了良好的沉降控制效果. Abstract：To study the influence of shield tunneling parameters on surface subsidence,combined with the field monitoring results of a shield project on Beijing Metro Line 19,the Pearson correlation coefficient method is used to analyze the correlation of linear regression of the influence of shield tunneling parameters on surface subsidence,and the significance level of linear correlation is tested.The fluctuation range of shield tunneling parameters and the law of surface subsidence are statistically analyzed,and then the fine control of surface subsidence is realized by controlling parameters.The results demonstrated the reliable application of the Pearson correlation coefficient method in this project.The two key control pa...

《施工技术（中英文）》| 2024年01期

基于聚类与Transformer算法的上软下硬地层盾构滚刀正常磨损预测

盾构法是隧道施工的主流方法,广泛应用于软土地层与复合地层.盾构机在上软下硬地层中掘进时,准确预测滚刀的磨损以便及时更换滚刀是确保施工安全与效率的关键.基于机器学习中的无监督kmeans聚类算法、有监督Transformer算法以及遗传算法,提出了一种根据刀盘前方地层条件、滚刀布设以及施工参数预测滚刀正常磨损的方法.kmeans聚类算法用于实时分析当前盾构施工参数间的关系,从而划分不同施工状态,并为不同施工状态分配不同的磨损修正系数作为Transformer模型的输入参数.根据地层条件及施工参数相关关系确定磨损修正系数初始值的大小,借助遗传算法对磨损修正系数进行优化.Transformer算法中,以地层条件、施工参数、滚刀安装半径和切削距离以及kmeans聚类得到的磨损修正系数作为输入参数,以滚刀磨损量作为输出参数,并由遗传算法对模型的超参数...Abstract：Shield tunneling is the main method for tunnel construction,widely used in soft strata and composite strata.How to accurately predict the tool wear when the shield machine is tunneling in the upper soft and lower hard strata is an important issue to ensure construction safety and efficiency.Based on the unsupervised clustering algorithm,supervised Transformer algorithm and genetic algorithm in machine learning,a method is proposed to predict tool wear based on the ground conditions,tool placement and construction parameters.The kmeans clustering algorithm is used to analyze the relationship between the shield construction parameters,so as to classify different construction states in order to assign diffe.

《施工技术（中英文）》| 2024年01期

上软下硬地层袖阀管注浆对盾构下穿民房扰动控制分析

为了探究深圳上软下硬地层中袖阀管注浆对盾构下穿民房的扰动控制效果,依托深圳轨道交通 11 号线二期某区间盾构穿越节点,实施了四环节一体的袖阀管注浆加固穿越扰动控制方案,包括穿越前加固必要性模拟验证、加固效果模拟评估、穿越期间施工扰动监测、穿越后加固效果分析.建立了未加固和加固两种工况下盾构穿越的三维有限元数值模型,基于实测数据检验了模型计算结果的可靠性,结果表明在未加固工况下民房沉降极易超越警戒值,验证了袖阀管注浆加固的必要性.而后基于加固模型评估了袖阀管注浆加固效果,计算表明袖阀管注浆加固至少将民房测点的沉降降低了 40%,可有效控制盾构穿越对民房造成的施工扰动,实际监测数据与数值模拟吻合较好.此外,实测和模拟表明注浆加固将改变地表沉降槽形状,加固范围内的地表沉降将显著减小,沉降槽呈不对称分布.

《施工技术（中英文）》| 2024年01期

钻爆法隧道下穿既有双连拱隧道施工技术研究

钻爆法隧道穿越新建既有双连拱隧道结构,下穿隧道为大跨度隧道,高度大、埋深较深,且在穿越既有隧道时,不能影响其安全运营和造成结构破坏,施工难度大、风险高.采用有限元软件Midas GTS NX对钻爆法隧道下穿既有隧道的变形和受力情况进行数值模拟计算,并研究了下穿施工前对上方隧道间地层采用大管棚和锚杆联合加固产生的效果.研究表明:未加固时,施工侧隧道结构的沉降要大于另一侧,呈现出"一峰二谷"变形形状,既有隧道上下部极易发生结构破坏.采用大管棚及锚杆联合加固,有效地转移了应力集中现象,降低了结构破坏风险,并且既有隧道沉降量仅为前者变化量的 1/1.83,在控制标准以内. Abstract：The drilling and blasting tunnel crosses the newly built existing double-arch tunnel structure.The subway is a large span tunnel,with a large height and deep burial,and when crossing the existing tunnel,it cannot affect its safe operation and structural damage,the construction is difficult.A numerical simulation was carried out using the finite element software Midas GTS NX to calculate the deformation and stresses of a drilling and blasting tunnel underpassing an existing tunnel,and to study the effect of the combined reinforcement of the inter-tunnel strata above using large pipe sheds and anchors before the underpass construction.Studies have shown that the settlement of the tunnel structure on the co..

《施工技术（中英文）》| 2024年01期

高压富水硬岩地层双护盾TBM前置式超前注浆堵水技术研究

晋中引黄输水隧洞双护盾TBM施工穿越高压富水裂隙,掌子面高压大流量突涌水严重,采用常规后置式超前注浆技术对掌子面突涌水进行超前处置效果不佳,主要原因是受外插角影响,采用常规后置式超前注浆存在注浆目标区域受限、钻探效率低、超前注浆控制难度大等问题,难以形成有效的止水帷幕结构.对隧洞水文地质条件、突涌水情况及超前注浆技术进行系统研究分析,提出双护盾TBM前置式超前注浆堵水工艺,通过优化注浆设备,在掌子面处实施超前注浆堵水.开展现场注浆试验,对坚硬岩面钻孔施工、注浆材料、注浆参数控制及注浆段长优化等技术进行研究,并根据现场试验信息,不断优化注浆设备及工艺.通过对晋中引黄输水隧洞实施前置式超前注浆堵水技术,洞内平均出水量降至 3 702m3/d,降幅达 75.9%,同时在一定程度上提高了TBM施工效率.实践证明该技术方法有效. Abstract：The double-shield tunnel boring machine(TBM)construction of the Jinzhong Yellow River Water Diversion Tunnel crosses high-pressure and water-rich fractures,and the high-pressure and large-flow water inrush on the tunnel face is serious.The conventional rear-loaded pre-grouting technology was used to cope with the water inrush on the tunnel face but proved to be ineffective.The main reason is that due to the influence of the external angle,conventional rear-loaded pre-grouting has such problems as limited grouting target area,low drilling efficiency,difficulty in pre-grouting control,it is difficult to form an effective waterproof curtain structure.Through systematic study and analysis of the hydrogeological con...

《施工技术（中英文）》| 2024年01期

黄土地区PBA法暗挖车站快速施工关键技术研究

西安地铁何家营站是首次将"上四下二"六导洞PBA开挖工法应用于黄土地区的地下暗挖车站.群洞开挖本身具有较高的安全风险,而本项目工期紧张,需加快施工进度.利用MIDAS GTS NX对原导洞开挖方案进行优化,采用了上、下部导洞同时开挖、错距进行的方法.通过对比分析,结果表明:采用优化方案开挖时,地表沉降较小;上部边导洞的拱顶竖向变形明显增大,其余导洞的竖向变形均略小于原方案;上部边导洞的初支结构弯矩有小幅增长,其他导洞初支结构弯矩略有减小.通过技术经济指标对比分析,优化开挖方案在确保安全的前提下,能够极大提高施工效率,有效节约工期和费用.现场按优化方案开挖完成后,实测地表沉降未超出施工控制要求,且与计算结果较为吻合. Abstract：The Hejiaying Station of the Xi'an Metro is the first underground excavation station that applies the PBA excavation method of the"upper four lower two"six-pilot tunnel to the loess area.The excavation of group holes itself has a high risk,furthermore,the construction period of this project is tight.Therefore,it is necessary to speed up the construction progress.MIDAS GTS NX was used to optimize the excavation scheme of the original pilot tunnel,and the method of simultaneous excavation of the upper and lower pilot tunnels and alternate distance was adopted.Through comparative analysis,the results show that the surface settlement is small when the optimization scheme is used for excavatio

《施工技术（中英文）》| 2024年01期