车行荷载作用下悬索桥隧道式锚碇稳定性分析
发布时间：2018-09-07 13:28
【摘要】：近年来,桥梁的不断建造和持续发展在我国的交通事业中占据着主导地位,随着桥梁施工技术和设计技术的不断进步,悬索桥便在纵多大跨径桥型当中应运而生,解决了人们跨越峡谷、河道、大江、海域等技术上的难题。作为悬索桥一个重要的承载构件,锚碇在整个悬索桥的设计和施工中是一个很重要的环节。在众多的桥梁隧道式锚碇工程计算研究中,车辆与结构动力的作用是一个相对复杂的难题。当列车通过桥梁时,桥梁结构除了要承受静荷载作用外,还要承受包括移动荷载对桥梁的惯性力等动力荷载的作用。对于车行荷载对悬索桥隧道锚设计的研究,目前大多数只是在车行荷载方面做出相应研究以及在隧道式锚定设计与施工方面进行研究。而同时“将车行荷载”和“隧道锚稳定性的分析”结合起来的研究相对较少。悬索桥在最不利车行荷载作用下隧道式锚碇稳定性问题是本课题的关键。本文介绍了悬索桥隧道锚的结构,作用机理以及稳定性的相关理论,利用拟静力法在车行荷载作用下的理论研究分析悬索桥在最不利车行荷载作用下索缆处传递到隧道式锚碇的受力。以贵州坝陵河悬索桥为工程实例,建立悬索桥三维模型并施加最不利车行荷载,最终得到桥梁在最不利车行荷载作用下主缆所受的最大的拉力。同时建立岩体的三维模型,并将悬索桥在最不利车行荷载作用下受到的的最大主缆拉力,以及3到5倍的最大缆力,施加在悬索桥锚碇区锚塞体上。对锚碇区岩体的开挖和回填进行相应的稳定性分析最终得出如下结论:○1从岩体开挖后的位移和应力来看,位移和应力较小,开挖后锚洞四周岩土均有向内倾斜的趋势,为保证下一个阶段的正常施工,应予加固处理。○2在3到5倍索缆拉力作用下,位移较小,隧道锚体及岩体的位移和应力较小,整体处于安全状态,不影响桥梁的正常工作。○3继续施加大缆力,当施加7倍缆力时,在开挖岩体的四周及锚碇区与围岩的交界面处出现了塑性区,并随着缆力的增加塑性区逐渐向岩体四周扩展。本文对坝陵河悬索桥隧道锚固系统以及围岩进行了安全评估,为设计与施工提供重要的依据。
[Abstract]:In recent years, the continuous construction and sustainable development of bridges play a leading role in China's transportation industry. With the continuous progress of bridge construction technology and design technology, suspension bridges emerge as the times require in the longitudinal multi-span bridge. Solve people across canyons, rivers, sea areas and other technical problems. As an important bearing member of suspension bridge, Anchorage is an important link in the design and construction of suspension bridge. The role of vehicle and structure is a relatively complicated problem in the calculation of bridge tunnel Anchorage engineering. When the train passes through the bridge, the bridge structure must bear not only the static load, but also the dynamic load, including the inertia force of the moving load on the bridge. At present, most of the researches on the design of tunnel anchors for suspension bridges are only related to the vehicle load and the design and construction of tunnel anchoring. At the same time, the combination of vehicle load and analysis of tunnel anchor stability is relatively rare. The stability of the tunnel Anchorage of suspension bridge under the most unfavorable vehicle load is the key of this paper. In this paper, the structure, action mechanism and stability theory of suspension bridge tunnel anchor are introduced. The theory of quasi-static method under vehicle load is used to study and analyze the force of cable transfer from cable to tunnel Anchorage of suspension bridge under the most unfavorable vehicle load. Taking the suspension bridge of Baling River in Guizhou as an engineering example, the three-dimensional model of suspension bridge is established and the most unfavorable vehicle load is applied. Finally, the maximum tensile force of the main cable under the most unfavorable vehicle load is obtained. At the same time, the 3D model of rock mass is established, and the maximum main cable tension and the maximum cable force of 3 to 5 times are applied to the anchorages of suspension bridges under the most unfavorable vehicle load. The stability analysis of excavation and backfill of rock mass in Anchorage area is carried out. The conclusion is as follows: from the point of view of displacement and stress of rock mass excavation, the displacement and stress are smaller, and the rock and soil around the anchor hole tend to tilt inward after excavation. In order to ensure the normal construction of the next stage, the reinforcement treatment .02 should be strengthened under the action of 3 to 5 times cable tension, the displacement is smaller, the displacement and stress of the tunnel anchor and rock mass are smaller, and the whole is in a safe state. It does not affect the normal operation of the bridge .03 continues to exert a large cable force. When applied 7 times cable force, plastic zone appears around the excavation rock mass and the interface between the Anchorage area and the surrounding rock. With the increase of cable force, the plastic zone gradually extends to the surrounding rock mass. In this paper, the Anchorage system and surrounding rock of the suspension bridge tunnel in Baling River are evaluated, which provides an important basis for design and construction.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.25
本文编号：2228396
[Abstract]:In recent years, the continuous construction and sustainable development of bridges play a leading role in China's transportation industry. With the continuous progress of bridge construction technology and design technology, suspension bridges emerge as the times require in the longitudinal multi-span bridge. Solve people across canyons, rivers, sea areas and other technical problems. As an important bearing member of suspension bridge, Anchorage is an important link in the design and construction of suspension bridge. The role of vehicle and structure is a relatively complicated problem in the calculation of bridge tunnel Anchorage engineering. When the train passes through the bridge, the bridge structure must bear not only the static load, but also the dynamic load, including the inertia force of the moving load on the bridge. At present, most of the researches on the design of tunnel anchors for suspension bridges are only related to the vehicle load and the design and construction of tunnel anchoring. At the same time, the combination of vehicle load and analysis of tunnel anchor stability is relatively rare. The stability of the tunnel Anchorage of suspension bridge under the most unfavorable vehicle load is the key of this paper. In this paper, the structure, action mechanism and stability theory of suspension bridge tunnel anchor are introduced. The theory of quasi-static method under vehicle load is used to study and analyze the force of cable transfer from cable to tunnel Anchorage of suspension bridge under the most unfavorable vehicle load. Taking the suspension bridge of Baling River in Guizhou as an engineering example, the three-dimensional model of suspension bridge is established and the most unfavorable vehicle load is applied. Finally, the maximum tensile force of the main cable under the most unfavorable vehicle load is obtained. At the same time, the 3D model of rock mass is established, and the maximum main cable tension and the maximum cable force of 3 to 5 times are applied to the anchorages of suspension bridges under the most unfavorable vehicle load. The stability analysis of excavation and backfill of rock mass in Anchorage area is carried out. The conclusion is as follows: from the point of view of displacement and stress of rock mass excavation, the displacement and stress are smaller, and the rock and soil around the anchor hole tend to tilt inward after excavation. In order to ensure the normal construction of the next stage, the reinforcement treatment .02 should be strengthened under the action of 3 to 5 times cable tension, the displacement is smaller, the displacement and stress of the tunnel anchor and rock mass are smaller, and the whole is in a safe state. It does not affect the normal operation of the bridge .03 continues to exert a large cable force. When applied 7 times cable force, plastic zone appears around the excavation rock mass and the interface between the Anchorage area and the surrounding rock. With the increase of cable force, the plastic zone gradually extends to the surrounding rock mass. In this paper, the Anchorage system and surrounding rock of the suspension bridge tunnel in Baling River are evaluated, which provides an important basis for design and construction.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.25
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