浅埋大断面公路隧道单侧壁导坑法施工力学行为研究
发布时间：2018-11-18 22:22
【摘要】：伴随着我国社会经济和交通事业全面发展，为了缓解日益拥堵的交通状况，在我国的交通工程建设中出现了越来越多的大断面公路隧道，而这些大断面隧道中较多都处于浅埋与偏压的不良地质环境下。因此，研究在浅埋偏压的地质条件下，大断面隧道的开挖和支护过程中围岩以及支护结构的施工力学行为，并对浅埋和偏压的情况单独进行探讨，对浅埋大断面偏压隧道的设计和施工都有重要的意义。 本文以贵阳花果园松花路大断面隧道为工程背景，主要采用单侧壁导坑法的施工方法，通过理论分析和数值模拟，主要内容与研究成果如下： ①建立大断面公路隧道的弹塑数值模型，对松花路隧道的单侧壁导坑法施工过程进行模拟计算，对浅埋大断面偏压隧道的施工力学行为进行分析。此施工方法情况下主要在左上侧后行导坑开挖这一阶段的位移值最大，隧道拱顶沉降最大值偏向于隧道埋深较深一侧，左上导坑开挖是施工的最薄弱环节。 ②隧道拱底隆起回弹最大值偏向于埋深较浅一侧；隧道顶部出现了拉应力，埋深较深一侧拱脚与埋深较浅一侧隧道起拱线部位产生了不同程度压应力集中；隧道埋深较深一侧围岩的压力释放明显比埋深浅侧大，，而且应力集中现象也要严重一些；初期支护喷射混凝土轴力在先开挖侧基本都大于后开挖侧，可对支护结构进行合理偏压设计。 ③通过对浅埋大断面偏压隧道单侧壁导坑法施工下先开挖浅埋侧和先开挖深埋侧两种工况的模拟计算进行对比分析，得出在特定浅埋偏压条件下大断面隧道先开挖浅埋一侧对隧道的围岩稳定性和支护结构受力更为有利。 ④以松花路隧道为原型，建立在埋置深度变化和地面坡度变化时的数值模型，计算与分析隧道的施工力学行为和变化特征，同时对比其对围岩和支护结构的影响。得出了当埋置深度逐渐变大时，隧道周边围岩压力整体逐渐变大的，而整体上的偏压效应将减小。当地面坡度逐渐变大时，隧道埋置深度较深一侧的围岩压力增大较明显，偏压效应也更加明显的结论。
[Abstract]:With the overall development of our country's social economy and transportation, in order to alleviate the increasingly congested traffic situation, more and more large-section highway tunnels appear in the construction of traffic engineering in our country. However, most of these large-section tunnels are in the poor geological environment of shallow burying and bias. Therefore, under the geological condition of shallow buried bias, the mechanical behavior of surrounding rock and supporting structure during excavation and support of large section tunnel is studied, and the situation of shallow burial and partial pressure is discussed separately. It is of great significance for the design and construction of shallow large section bias tunnel. Based on the large section tunnel of Songhua Road in Guiyang flower orchard, this paper mainly adopts the construction method of single side wall guide pit, through theoretical analysis and numerical simulation. The main contents and research results are as follows: 1 the elastic-plastic numerical model of large-section highway tunnel is established. The construction mechanics behavior of shallow-buried large-section bias-pressure tunnel is analyzed. In this construction method, the displacement value is the largest in the stage of excavation of the tunnel, the maximum settlement of the tunnel arch is inclined to the deeper side of the tunnel, and the excavation of the left top guide pit is the weakest link in the construction. (2) the maximum springback of the arch bottom of the tunnel is inclined to the shallow side of the tunnel, the tensile stress appears at the top of the tunnel, and the stress concentration of the arch foot in the deeper side of the tunnel and the arch line in the tunnel on the shallow side of the buried depth are different degrees. The pressure release of the surrounding rock in the deep side of the tunnel is obviously larger than that in the shallow side of the tunnel, and the phenomenon of stress concentration is more serious. The axial force of primary shotcrete is larger than that of excavated side at first, so it can be used to design the support structure under reasonable bias pressure. (3) through the comparison and analysis of the simulation calculation of the shallow buried side and the deep burying side under the construction of the single side wall guide pit method of the shallow large section bias pressure tunnel, the simulation calculation of the shallow buried side and the deep buried side before excavation are compared and analyzed. It is concluded that the first excavation of the shallow side of the large-section tunnel is more favorable to the stability of the surrounding rock and the force of the supporting structure under the condition of specific shallow burying bias pressure. (4) taking Songhua Road Tunnel as the prototype, the numerical model is established when the buried depth changes and the surface slope changes. The construction mechanical behavior and variation characteristics of the tunnel are calculated and analyzed. At the same time, the influence of the tunnel on the surrounding rock and the supporting structure is compared. It is concluded that when the buried depth increases gradually, the surrounding rock pressure increases gradually, and the bias effect decreases. When the slope of the tunnel increases gradually, the surrounding rock pressure of the deep side of the tunnel increases more obviously, and the effect of bias pressure is more obvious.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4
本文编号：2341453
[Abstract]:With the overall development of our country's social economy and transportation, in order to alleviate the increasingly congested traffic situation, more and more large-section highway tunnels appear in the construction of traffic engineering in our country. However, most of these large-section tunnels are in the poor geological environment of shallow burying and bias. Therefore, under the geological condition of shallow buried bias, the mechanical behavior of surrounding rock and supporting structure during excavation and support of large section tunnel is studied, and the situation of shallow burial and partial pressure is discussed separately. It is of great significance for the design and construction of shallow large section bias tunnel. Based on the large section tunnel of Songhua Road in Guiyang flower orchard, this paper mainly adopts the construction method of single side wall guide pit, through theoretical analysis and numerical simulation. The main contents and research results are as follows: 1 the elastic-plastic numerical model of large-section highway tunnel is established. The construction mechanics behavior of shallow-buried large-section bias-pressure tunnel is analyzed. In this construction method, the displacement value is the largest in the stage of excavation of the tunnel, the maximum settlement of the tunnel arch is inclined to the deeper side of the tunnel, and the excavation of the left top guide pit is the weakest link in the construction. (2) the maximum springback of the arch bottom of the tunnel is inclined to the shallow side of the tunnel, the tensile stress appears at the top of the tunnel, and the stress concentration of the arch foot in the deeper side of the tunnel and the arch line in the tunnel on the shallow side of the buried depth are different degrees. The pressure release of the surrounding rock in the deep side of the tunnel is obviously larger than that in the shallow side of the tunnel, and the phenomenon of stress concentration is more serious. The axial force of primary shotcrete is larger than that of excavated side at first, so it can be used to design the support structure under reasonable bias pressure. (3) through the comparison and analysis of the simulation calculation of the shallow buried side and the deep burying side under the construction of the single side wall guide pit method of the shallow large section bias pressure tunnel, the simulation calculation of the shallow buried side and the deep buried side before excavation are compared and analyzed. It is concluded that the first excavation of the shallow side of the large-section tunnel is more favorable to the stability of the surrounding rock and the force of the supporting structure under the condition of specific shallow burying bias pressure. (4) taking Songhua Road Tunnel as the prototype, the numerical model is established when the buried depth changes and the surface slope changes. The construction mechanical behavior and variation characteristics of the tunnel are calculated and analyzed. At the same time, the influence of the tunnel on the surrounding rock and the supporting structure is compared. It is concluded that when the buried depth increases gradually, the surrounding rock pressure increases gradually, and the bias effect decreases. When the slope of the tunnel increases gradually, the surrounding rock pressure of the deep side of the tunnel increases more obviously, and the effect of bias pressure is more obvious.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4
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