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本文讲述了对一条长1035m的公路隧道地震反应的分析结果,这条隧道在接近地面的软土层与其下面起伏的硬土地层之间穿过,并且根据调查结果,拟定了隧道轴向的结构设计方法。 根据过去对那些沉埋在软土中的隧道的研究,隧道的地震响应特点,常常会因地层条件和施工方法而不同。首先,硬土层和软土层很可能沿隧道轴线多处交替出现,这就可能产生复杂的局部区段力。其次,隧道的侧壁是与就地浇注的地下连续墙结合成一体,而地下连续墙是在明挖回填法施工中被用作阻止滑坡的挡墙,而且它是插入到硬土地层中去的,因此,硬土地层的振动特性可能通过地下连续墙对隧道洞身产生影响。 通过地震响应的分析,弄明白上述的影响之后,作者决定在简化的结构上设有很多仅允许有微量膨胀的弹性接缝,认为这是一种对付所产生的有限位移、隧道洞身的应力下降、公路的运行条件和地表沉陷的有效方法。在地表沉陷情况下,隧道的轴向加固钢筋加上通常所需的横向钢筋就能达到充分抵抗地震的效果。
This paper describes the analysis of the seismic response of a 1035m highway tunnel that passes between a soft soil layer near the ground and an undulating hard earth layer beneath it and based on the survey results the tunnel axial structure Design method According to the past research on those tunnels buried in soft soil, the seismic response characteristics of the tunnels often differ according to the formation conditions and construction methods. First, hard and soft layers are likely to alternate along multiple tunnel axes, creating complex local section forces. Secondly, the side walls of the tunnel are integrated with the cast-in-place diaphragm wall, which is used as a stop wall to prevent landslides in the cut-and-fill method and which is inserted into the hard earth formation Therefore, the vibration characteristics of the hard ground may affect the tunnel borehole through the diaphragm wall. After analyzing the seismic response, and understanding the above effects, the authors decided to provide a simplified structure with many elastic joints that allow only a small amount of expansion. This is considered to be a stress response to the finite displacements and boreholes that occur Decline, highway operating conditions and surface subsidence effective method. In the case of surface subsidence, the axial reinforcement of the tunnel, together with the transverse reinforcement that is usually required, will be sufficient to withstand the effects of the earthquake.