高速铁路隧道洞口缓冲结构抗减震措施研究

发布时间：2018-04-20 11:37

本文选题：高速铁路 + 隧道　；参考：《西南交通大学》2016年硕士论文

【摘要】：高速列车高速穿越隧道时会产生明显的气动效应,为解决这一问题通常会在洞口设置缓冲结构。相比于隧道,洞口缓冲结构的抗减震性能要差很多。我国高铁发展迅猛,且全国大部分地区都是地震设防区,因此,研究高速铁路隧道洞外缓冲结构的地震响应特性以及其抗减震措施具有重要意义。本文运用有限元软件ABAQUS模拟分析了条顶组合开口、侧顶组合开口、间缝式双开口、条带式双开口和无开口缓冲结构地震动力响应特性；同时提出抗震缝、混凝土底板、联合设置抗震缝和混凝土底板以及联合设置抗震缝和钢筋拉杆四种抗减震措施,并对其抗减震性能进行了模拟分析和评价,得到的主要结论有：(1)在地震荷载作用下,拱顶加速响应最大,拱肩和拱腰次之,拱脚和仰拱较小；各缓冲结构整体加速度响应大小顺序为：条带式双开口条顶组合开口无开口侧顶组合开口间缝式双开口；开口对其附近部位加速度有一定放大作用。(2)在地震荷载作用下,拱腰的Mises应力最大,拱肩次之,拱脚第三,拱顶和仰拱较小(条带式双开口拱顶和拱脚的Mises应力值相差不多)；各缓冲结构整体Mises应力响应大小顺序为：条带式双开口无开口侧顶组合开口、间缝式双开口条顶组合开口；开口附近部位的Mises应力变化幅度较大。(3)在地震荷载作用下,整体上拱腰的最大主应力最大,拱顶次之,拱肩第三,拱脚第四,仰拱最小；各缓冲结构整体最大主应力响应大小顺序为：无开口间缝式双开口侧顶组合开口条带式双开口条顶组合开口；开口放大了最大主应力值。(4)抗震缝对缓冲结构抗震缝附近各部位的加速度响应有一定放大作用,但有效减小了各部位Mises应力响应峰值和最大主应力值,抗减震效果较好。(5)混凝土底板对缓冲结构除拱顶外的所有其他部位加速度响应表现出极大的放大作用；对Mises应力和最大主应力在靠近洞口段表现出了明显的放大作用,远离洞口段则表现为一定的减小作用,抗减震效果较差。(6)联合使用抗震缝和混凝土底板整体上对缓冲结构各部位加速度、Mises应力和最大主应力值有极好的减小作用,抗减震措施好。(7)联合使用抗震缝和钢筋拉杆对缓冲结构各部位加速度有极大的放大作用,且放大了大部分部位的Mises应力和最大主应力,抗减震效果差。
[Abstract]:The aerodynamic effect of high-speed train passing through the tunnel at high speed is obvious. To solve this problem, buffer structure is usually set up at the entrance of the tunnel. Compared with the tunnel, the damping performance of the orifice buffer structure is much worse than that of the tunnel. The high-speed rail in China is developing rapidly, and most areas in China are seismic fortification areas. Therefore, it is of great significance to study the seismic response characteristics of the buffer structure outside the tunnel of high-speed railway tunnel and its anti-seismic mitigation measures. In this paper, finite element software ABAQUS is used to simulate and analyze the seismic dynamic response characteristics of strip top combined opening, side top combined opening, intersecting double opening, strip double opening and non-opening buffer structure, and the seismic joint and concrete floor slab are also proposed. Four kinds of anti-seismic measures are jointly set up, such as anti-seismic joint and concrete floor slab, joint anti-seismic joint and steel bar, and their anti-seismic performance is simulated and evaluated. The main conclusions are as follows: (1) under earthquake load, The acceleration response of arch roof is the biggest, the arch shoulder and arch waist is the second, the arch foot and inverted arch are smaller, the order of the whole acceleration response of each buffer structure is: strip type double opening with double opening top combined opening, no opening side top combination opening joint opening double opening; The Mises stress of arch waist is the largest, the arch shoulder is the second, and the arch foot is the third. The Mises stress of the arch roof and inverted arch is small (the Mises stress value of the strip double opening arch roof and arch foot is not much difference), the order of the whole Mises stress response of each buffer structure is as follows: the strip double opening without opening side top combined opening, the interspersed double opening top combined opening; Under earthquake load, the maximum principal stress of the whole arch waist is the largest, the arch top is the second, the arch shoulder is the third, the arch foot is the fourth, and the inverted arch is the smallest. The order of the maximum principal stress response of each buffer structure is as follows: there is no slit between openings, double openings, side tops, open strips, double openings, top combination openings; The opening magnifies the maximum principal stress value. 4) the seismic joint can enlarge the acceleration response of every part near the seismic joint of the buffer structure to some extent, but effectively reduces the peak value and the maximum principal stress value of the Mises stress response in each part. The concrete floor can greatly amplify the acceleration response of all parts of the buffer structure except the arch, and obviously amplify the Mises stress and the maximum principal stress near the orifice. The joint use of seismic joints and concrete floor can reduce the acceleration stress and the maximum principal stress of the buffer structure as a whole, and the maximum principal stress of the buffer structure can be reduced by the combination of anti-seismic joint and concrete bottom slab, and the effect of the joint use of anti-seismic joint and concrete bottom slab on the value of Mises stress and the maximum principal stress of the buffer structure is very good. The combination of seismic joint and steel bar can greatly enlarge the acceleration of the buffer structure, and amplify the Mises stress and the maximum principal stress of most parts, so the anti-seismic effect is not good.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U452.28

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