防水型隧道结构计算模式与设计方法研究
发布时间：2018-10-13 09:24
【摘要】：随着我国高速铁路事业的快速发展,为使车站尽量靠近城市,出现了较多下穿城市的大断面铁路隧道,特别是城市附近有河流、湖泊时,需要修建下穿的水下隧道。如果在隧道施工和运营中,任凭地下水的流失和排放,必将造成城市地面的沉陷、甚至建(构)筑物的倾斜破坏等,也将对整个城市的生态环境造成重大影响,因此需要修建防水型隧道以减少或避免对城市环境的破坏。对于防水型隧道,尽管国内外有一些相关研究,但仅限于个案,且目前行业标准中对防水型隧道几乎没有相应的规定和要求。基于以上背景,本论文对防水型隧道的结构计算模式与设计方法展开较为深入细致的研究。 本论文从研究防水型隧道荷载作用模式入手,以理论分析、数值模拟计算以及现场测试为研究手段,对防水型隧道的结构承载机理、水土压力作用模式、地层抗力特征以及结构计算模式进行分析与研究,并通过试验研究了防水材料的性能指标、施工工艺等,最终形成一套具有理论支撑的基于浅埋矿山法的防水型隧道设计方法。主要结论和成果如下： 一、提出了基于浅埋矿山法防水型隧道的二次衬砌荷载作用模式。对于石质隧道,二次衬砌承受的垂直围岩压力按现行《铁路隧道设计规范》计算,Ⅳ、V级围岩地段应考虑仰拱基底反力的主动力作用,水平侧压力系数建议经实测得到或取经验值1.0-1.5,外水压力按全水头径向作用在二次衬砌结构上考虑；对于土质隧道,二次衬砌承受的垂直土压力同样按现行《铁路隧道设计规范》计算,并考虑仰拱基底反力的主动力作用,水平侧压力根据土层的性质分别采用水土分算或者水土合算原则,外水压力根据地层条件按静水压力或水土合算考虑。 二、提出了防水型隧道的结构计算模式。通过对防水型隧道三种计算模式的比较分析,得出防水型隧道的合理计算模式,即分别采用全周弹簧模型、全周弹簧+仰拱基底反力模型进行结构内力计算分析,获取最终的内力包络图,按照最不利工况进行结构设计。 三、提出了防水型隧道水压力的作用规律,得出了防水型隧道的合理设计方法。基于防水型隧道的结构计算模式,通过数值计算及现场试验,研究了地下水位变化对二次衬砌结构内力的影响,说明了水位高低对隧道不同部位影响差异较大,应采用施工和运营期间可能出现的最高水位和最低水位分别对隧道进行计算,提出了防水型隧道衬砌结构的设计方法。 四、通过室内实验及现场试验手段,提出了用于防水型隧道的自粘型防水板的主要性能指标并形成了防水型隧道的防水施工技术；引入“皮肤式”防水理念,防水型隧道采用自粘型防水板全环铺设,一道设防可以胜任较高防水要求。 本文提出的防水型隧道荷载作用模式、结构计算模型、结构设计方法以及防水技术措施成功应用于武广高速铁路浏阳河隧道、金沙洲隧道以及长沙市湘江大道浏阳河隧道的设计与施工。目前这三座隧道均已投入运营,从现场的监测、验收评估以及运营部门的反馈来看,所施作的防水型隧道总体防水效果较好,对周边环境影响较小,能够满足长期运营的要求,验证了研究成果的正确性,表明本文所提出的防水型隧道结构计算模型与设计方法的合理性与可行性,可在有关规范修订中纳入,并在类似工程的建设中进一步推广。
[Abstract]:With the rapid development of our country's high-speed railway, in order to make the station close to the city as much as possible, a large section of railway tunnel, especially in the vicinity of the city, needs to be built under construction. In the construction and operation of the tunnel, the loss and discharge of groundwater will inevitably cause the subsidence of the ground of the city and even the inclination destruction of buildings (structures), which will have a great influence on the ecological environment of the whole city, it is therefore necessary to construct a waterproof tunnel to reduce or avoid damage to the urban environment. For waterproof tunnels, although there are some related researches at home and abroad, it is limited to cases, and there are almost no corresponding regulations and requirements for waterproof tunnels in the current industry standards. Based on the above background, this paper studies the structure calculation model and design method of waterproof tunnel. Based on the study of the model of waterproof tunnel load, the paper analyzes the structure bearing mechanism, water and soil pressure acting mode, stratum resistance characteristic and structure calculation model of waterproof tunnel with theoretical analysis, numerical simulation and on-site test as the research means. The performance index and construction technology of waterproof material are studied by experiment, and a set of waterproof tunnel design based on shallow buried mine method with theoretical support is finally formed. Methods. Main conclusions and outcomes The following conclusions are as follows: I put forward the secondary lining of waterproof tunnel based on shallow buried mine method. For the rock tunnel, the vertical surrounding rock pressure borne by the secondary lining shall be calculated according to the current Code for Design of Railway Tunnel> The main dynamic action of the inverted arch base reaction force shall be considered in the surrounding rock sections of Class IV and V. The horizontal lateral pressure coefficient shall be measured or taken as the experience value 1. 0-1.5, the external water pressure shall be considered in the secondary lining structure according to the radial effect of the full water head; for the soil tunnel, the vertical earth pressure borne by the secondary lining shall be calculated according to the current Code for Design of Railway Tunnel and consider the reaction force of the inverted arch base According to the nature of the soil layer, the main dynamic action and the horizontal lateral pressure shall be based on the principle of water-soil separation or water-soil conservation, and the external water pressure shall be based on hydrostatic pressure or water according to the formation conditions. it is cost-effective to consider. 2, a waterproof tunnel is put forward According to the comparison and analysis of three calculation modes of waterproof tunnel, the reasonable calculating mode of waterproof tunnel is obtained. The final internal force envelope diagram, according to the most unfavorable conditions The design of water-proof tunnel water pressure has been put forward. The reasonable design method of water type tunnel is based on the structure calculation model of waterproof tunnel. Through numerical calculation and field experiment, the influence of groundwater level change on the internal force of secondary lining structure is studied. The difference between different parts of the road is large, and the maximum water level and the lowest water level which may occur during construction and operation shall be calculated separately for the tunnel, and the waterproof type shall be put forward. According to the design method of tunnel lining structure, the main performance index of self-adhesive waterproof board for waterproof tunnel is put forward through indoor experiment and field test method, and waterproof construction technology of waterproof tunnel is formed; 鈥淪kin type鈥，
本文编号：2268094
[Abstract]:With the rapid development of our country's high-speed railway, in order to make the station close to the city as much as possible, a large section of railway tunnel, especially in the vicinity of the city, needs to be built under construction. In the construction and operation of the tunnel, the loss and discharge of groundwater will inevitably cause the subsidence of the ground of the city and even the inclination destruction of buildings (structures), which will have a great influence on the ecological environment of the whole city, it is therefore necessary to construct a waterproof tunnel to reduce or avoid damage to the urban environment. For waterproof tunnels, although there are some related researches at home and abroad, it is limited to cases, and there are almost no corresponding regulations and requirements for waterproof tunnels in the current industry standards. Based on the above background, this paper studies the structure calculation model and design method of waterproof tunnel. Based on the study of the model of waterproof tunnel load, the paper analyzes the structure bearing mechanism, water and soil pressure acting mode, stratum resistance characteristic and structure calculation model of waterproof tunnel with theoretical analysis, numerical simulation and on-site test as the research means. The performance index and construction technology of waterproof material are studied by experiment, and a set of waterproof tunnel design based on shallow buried mine method with theoretical support is finally formed. Methods. Main conclusions and outcomes The following conclusions are as follows: I put forward the secondary lining of waterproof tunnel based on shallow buried mine method. For the rock tunnel, the vertical surrounding rock pressure borne by the secondary lining shall be calculated according to the current Code for Design of Railway Tunnel> The main dynamic action of the inverted arch base reaction force shall be considered in the surrounding rock sections of Class IV and V. The horizontal lateral pressure coefficient shall be measured or taken as the experience value 1. 0-1.5, the external water pressure shall be considered in the secondary lining structure according to the radial effect of the full water head; for the soil tunnel, the vertical earth pressure borne by the secondary lining shall be calculated according to the current Code for Design of Railway Tunnel and consider the reaction force of the inverted arch base According to the nature of the soil layer, the main dynamic action and the horizontal lateral pressure shall be based on the principle of water-soil separation or water-soil conservation, and the external water pressure shall be based on hydrostatic pressure or water according to the formation conditions. it is cost-effective to consider. 2, a waterproof tunnel is put forward According to the comparison and analysis of three calculation modes of waterproof tunnel, the reasonable calculating mode of waterproof tunnel is obtained. The final internal force envelope diagram, according to the most unfavorable conditions The design of water-proof tunnel water pressure has been put forward. The reasonable design method of water type tunnel is based on the structure calculation model of waterproof tunnel. Through numerical calculation and field experiment, the influence of groundwater level change on the internal force of secondary lining structure is studied. The difference between different parts of the road is large, and the maximum water level and the lowest water level which may occur during construction and operation shall be calculated separately for the tunnel, and the waterproof type shall be put forward. According to the design method of tunnel lining structure, the main performance index of self-adhesive waterproof board for waterproof tunnel is put forward through indoor experiment and field test method, and waterproof construction technology of waterproof tunnel is formed; 鈥淪kin type鈥，
本文编号：2268094
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