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Study on Structural Service Performance of Heavy-Haul Railway Tunnel with Voided Base

机译：空底铁路重载隧道结构服务性能研究

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摘要

The structural design of heavy-haul railway tunnels still follows the design method of ordinary railway tunnels. Most of them do not take into account the influence of large axle load of 30 t or more, let alone such problems as void of surrounding rock under long-term dynamic loads. In order to analyze the dynamic response of heavy-haul railway tunnels tinder long-term reciprocating cyclic dynamic loads, considering the factors such as axle load of vehicle body, unsprung mass, and track irregularity, the vibration load time-history curve of heavy-haul railway trains is determined, the three-dimensional dynamics coupling model of dynamic load-tunnel-surrounding rock is established, and the fatigue life of the structure under different void conditions is analyzed based on the S-N curve of concrete. According to the study, the loading, unloading, and vibration caused by train passing will lead to fluctuations in the vertical displacement response of the monitoring point. The peaks and valleys of the response time-history curve correspond to the effect of the train wheels rolling through. When the void is 6 m wide and 10 cm thick, the vertical displacement of the inverted arch is increased by about 9 times, the peak velocity of the inverted arch is increased by about 3.8 times, and the maximum principal stress is increased by about 47.3%, compared with the condition without void. With the same void thickness, the vertical displacement and velocity curves of the inverted arch vary significantly with the increase of the void width. The width of the base void has a significant effect on the fatigue life of the structure of heavy-haul railway tunnels. Based on the operation requirement of 100-year service life, the ultimate void width is 2 m.
机译：重载铁路隧道的结构设计仍沿用普通铁路隧道的设计方法。它们中的大多数都没有考虑到30 t或更大的大轴载荷的影响，更不用说在长期动态载荷下围岩空隙的问题。为了分析重载铁路隧道火炬的长期往复循环动态载荷的动力响应，考虑了车体的轴重，簧下质量和轨道不平顺性等因素，重载的振动载荷时程曲线确定了运输铁路列车，建立了动荷载-隧道-围岩的三维动力耦合模型，并根据混凝土的SN曲线分析了结构在不同孔隙条件下的疲劳寿命。根据研究，列车通过引起的装载，卸载和振动将导致监测点的垂直位移响应出现波动。响应时间历史曲线的波峰和波谷对应于车轮滚动的影响。当空隙为6 m宽且10 cm厚时，倒拱的垂直位移增加大约9倍，倒拱的峰值速度增加大约3.8倍，最大主应力增加大约47.3 ％，与没有空隙的条件相比。在相同的空隙厚度下，倒拱的垂直位移和速度曲线随空隙宽度的增加而显着变化。基础空隙的宽度对重型铁路隧道结构的疲劳寿命有重要影响。根据100年使用寿命的运行要求，最终空隙宽度为2 m。

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  • 来源
    《Advances in civil engineering》 |2018年第9期|3510979.1-3510979.12|共12页
  • 作者

    Zhang Zhiqiang; Zeng Bowen; Da Chaolong; He Wanping;

  • 作者单位

    Southwest Jiaotong Univ, Key Lab Transportat Tunnel Engn, Minist Educ, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Key Lab Transportat Tunnel Engn, Minist Educ, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Key Lab Transportat Tunnel Engn, Minist Educ, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Key Lab Transportat Tunnel Engn, Minist Educ, Chengdu 610031, Sichuan, Peoples R China;

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