地铁隧道浅埋暗挖法施工预加固技术及其应用研究
发布时间：2018-11-15 19:37
【摘要】：地铁隧道建设过程中的如何保证地层稳定性是现在所研究的难题之一，地铁建设引起的地层沉降、周围土体失稳、对周围地下管线造成破坏、对地铁开挖周边高耸建筑的不利影响等，是地铁设计、施工所考虑的重要因素。隧道开挖破坏了围岩的原始应力状态，直接可能导致围岩的破坏失稳，因此，为了维持围岩的稳定状态，，必须采取一定的预加固措施，不同的预加固技术适应不同的工况，所以对特定条件下的地铁预加固技术开展研究具有很重要意义。 本文在充分查阅文献的基础上，结合西安地铁一号线洒金桥～北大街区间暗挖段隧道的工程背景，利用大型有限元软件Midas GTS建立数值计算模型，分别对无加固方案，锚杆注浆预加固，水平旋喷注浆预加固，管棚注浆预加固这四种工况进行了模拟分析对比，根据这四种模拟方案的竖向位移和水平位移的比较得出，管棚注浆预加固是大断面浅埋黄土地铁隧道的合理预支护方式。 本文采用现场监测数据和有限元数值模拟相结合的研究方法，将现场监测数据和数值模拟所得出结果进行对比，验证了数值模拟的适用性，也进一步验证了西安地铁一号线洒金桥～北大街区间隧道管棚超前支护这种施工设计方案的合理性，对类似工程有很重要的指导作用。
[Abstract]:How to ensure the formation stability in the construction of subway tunnel is one of the problems studied now. The ground settlement caused by the subway construction and the instability of the surrounding soil have caused damage to the surrounding underground pipeline. It is an important factor in subway design and construction that the unfavorable influence on the high-rise buildings around the subway excavation. Tunnel excavation destroys the original stress state of surrounding rock, which may directly lead to failure and instability of surrounding rock. Therefore, in order to maintain the stability of surrounding rock, certain pre-reinforcement measures must be taken and different pre-reinforcement techniques should be adopted to adapt to different working conditions. Therefore, it is of great significance to carry out research on subway pre-reinforcement technology under specific conditions. Based on the full reference of literature and the engineering background of the tunnel in the section of Shajin Bridge to North main Street of Xi'an Metro Line 1, this paper establishes a numerical calculation model by using the large-scale finite element software Midas GTS, respectively, for no reinforcement scheme. The four conditions of pre-reinforcement of bolt grouting, horizontal rotary grouting and pipe shed pre-reinforcement are analyzed and compared. According to the comparison of vertical displacement and horizontal displacement of the four simulation schemes, Pipe-shed grouting pre-reinforcement is a reasonable pre-supporting method for large-section shallow-buried loess subway tunnel. In this paper, the field monitoring data and finite element numerical simulation are used to compare the field monitoring data with the results obtained from the numerical simulation, and the applicability of the numerical simulation is verified. It also further verifies the rationality of the construction design scheme of the tunnel pipe shed advance support in the section of Shanjin Bridge to North main Street of Xi'an Metro Line 1, which is very important to the similar projects.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U231.3;U455.4
本文编号：2334249
[Abstract]:How to ensure the formation stability in the construction of subway tunnel is one of the problems studied now. The ground settlement caused by the subway construction and the instability of the surrounding soil have caused damage to the surrounding underground pipeline. It is an important factor in subway design and construction that the unfavorable influence on the high-rise buildings around the subway excavation. Tunnel excavation destroys the original stress state of surrounding rock, which may directly lead to failure and instability of surrounding rock. Therefore, in order to maintain the stability of surrounding rock, certain pre-reinforcement measures must be taken and different pre-reinforcement techniques should be adopted to adapt to different working conditions. Therefore, it is of great significance to carry out research on subway pre-reinforcement technology under specific conditions. Based on the full reference of literature and the engineering background of the tunnel in the section of Shajin Bridge to North main Street of Xi'an Metro Line 1, this paper establishes a numerical calculation model by using the large-scale finite element software Midas GTS, respectively, for no reinforcement scheme. The four conditions of pre-reinforcement of bolt grouting, horizontal rotary grouting and pipe shed pre-reinforcement are analyzed and compared. According to the comparison of vertical displacement and horizontal displacement of the four simulation schemes, Pipe-shed grouting pre-reinforcement is a reasonable pre-supporting method for large-section shallow-buried loess subway tunnel. In this paper, the field monitoring data and finite element numerical simulation are used to compare the field monitoring data with the results obtained from the numerical simulation, and the applicability of the numerical simulation is verified. It also further verifies the rationality of the construction design scheme of the tunnel pipe shed advance support in the section of Shanjin Bridge to North main Street of Xi'an Metro Line 1, which is very important to the similar projects.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U231.3;U455.4
【参考文献】
相关期刊论文 前1条
1 王金明;杨小礼;;浅埋暗挖地铁隧道不同工法对地表沉降的影响[J];石河子大学学报(自然科学版);2008年04期
本文编号：2334249
本文链接：https://www.wllwen.com/kejilunwen/jiaotonggongchenglunwen/2334249.html
