武汉地铁3号线过江隧道矿山法支护设计研究

发布时间：2018-04-25 15:00

本文选题：矿山法施工 + 过江隧道　；参考：《武汉工程大学》2015年硕士论文

【摘要】：矿山法开挖的隧道会因为爆破造成隧道附近围岩体破裂,形成松弛状态,所以矿山法施工的隧道需要一边进行掘进一边进行支护。然而支护的方法有很多种,影响到支护方案选择的因素也比较多,所以不同的工程选择的施工方案也不同,支护的选择也会有所不同,要根据工程实际的特殊条件来设计支护方案。本文结合以往的研究成果和工程实例,以武汉地铁3号线工程为背景,主要研究过江段矿山法开挖隧道的支护设计问题,并对其中一个区间进行数值分析。首先要确定施工方法,隧道开挖的施工方法一般是矿山法和盾构法,对不同的地层条件情况采用不同的施工方法。根据过江段的地质条件勘测结果,过江段的隧道首先经过的是较为坚硬的地层,适合使用矿山法进行施工,当隧道到达汉江后,隧道围岩较为软弱,可以使用盾构机直接掘进,所以过江段的施工采用矿山法开挖然后盾构机空推拼装管片的方法进行施工。其次,矿山法开挖的隧道围岩稳定性会遭到破坏,为了防止隧道的围岩因为失稳而塌陷,需要及时进行支护。矿山法开挖的隧道常用的初期支护方式有超前小导管、锚杆支护、钢筋网、格栅钢架和喷射混凝土等。再根据隧道所在区域的地质条件资料来判断隧道的地质条件优劣程度,结合以往的工程实例进行对比选择合适的支护方式。通过使用工程类比法得到矿山法施工段和矿山法盾构结合段的支护方案。当支护方案确定后要进行数值分析需要对支护参数进行拟定,支护参数一般是根据相似工程支护设计类比然后拟定的。最后将矿山法和盾构法结合施工段的支护方案和拟定的支护参数等因素通过ANSYS软件建立力学计算模型,阐述支护方案对地表和隧道顶部沉降的影响,分析设计的支护方案对围岩稳定性的影响,通过锚杆和喷射混凝土的受力情况,变形情况,分析支护参数的合理性。
[Abstract]:The tunnel excavated by the mine method will break up the surrounding rock mass near the tunnel because of blasting, so the tunnel constructed by the mine method needs to be supported while the tunneling is carried out. However, there are many kinds of supporting methods, and many factors affect the selection of supporting schemes, so the construction schemes of different projects are different, and the selection of support will also be different. The support scheme should be designed according to the special conditions of engineering practice. In this paper, based on the previous research results and engineering examples, based on Wuhan Metro Line 3 project, the support design of tunnel excavated by mining method is studied, and a numerical analysis is carried out on one of the sections. First of all, it is necessary to determine the construction method. The construction methods of tunnel excavation are generally mine method and shield method, and different construction methods are adopted for different formation conditions. According to the survey results of geological conditions across the river section, the tunnel across the river section first passes through a relatively hard stratum, which is suitable for construction by mining method. When the tunnel reaches the Hanjiang River, the surrounding rock of the tunnel is relatively weak, so it can be excavated directly by shield machine. Therefore, the construction of the river section is carried out by mining excavation method and then the shield machine empty-pushing and assembling the segments. Secondly, the stability of tunnel rock excavated by mining method will be destroyed, in order to prevent the tunnel surrounding rock from collapsing because of instability, it is necessary to support in time. In the early stage of tunnel excavation by mine method, there are small lead ducts, bolt support, steel mesh, grille steel frame and shotcrete, etc. Then according to the geological condition data of the tunnel area to judge the good and bad degree of the tunnel geological condition, combined with the past engineering examples to compare and select the appropriate supporting way. The support scheme of mine construction section and mine shield combined section is obtained by using engineering analogy method. It is necessary to draw up the support parameters when the support scheme is determined, and the parameters are usually drawn up according to the analogy of the support design of similar engineering. Finally, the factors such as mine method and shield method are combined with the supporting scheme of construction section and the parameters of supporting are established by ANSYS software, and the influence of supporting scheme on the settlement of surface and top of tunnel is expounded. The influence of the designed support scheme on the stability of surrounding rock is analyzed. The rationality of supporting parameters is analyzed through the stress and deformation of bolt and shotcrete.
【学位授予单位】：武汉工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U231.3;U455.7

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