贵阳地铁盾构隧道下穿高速铁路沉降规律研究
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作者单位:

1.贵州大学土木工程学院;2.中铁开发投资集团有限公司

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中图分类号:

U45

基金项目:

贵州省科学技术基金(黔科合基础-ZK[2022]一般082);贵州省科学技术基金(黔科合基础[2019]1057号);贵阳城市轨道交通科研项目(GD3-FW-YJ-05-2020-13-ZB)


Study on the settlement law of Guiyang metro shield tunnel underneath high-speed railway
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Affiliation:

1.School of Civil Engineering, Guizhou University;2.China Railway Development and Investment Group Co., Ltd

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    摘要:

    盾构隧道穿越高速铁路会对铁路轨道、路基等构筑物沉降产生影响,严重影响高速铁路的运行。为研究盾构隧道穿越高速铁路对框架箱涵、路基和高铁轨道的影响。依托贵阳轨道交通3号线,建立土层-框架涵-道床-轨道的模型,分析在石灰岩中采用盾构对框架涵、既有高铁轨道和路基的影响。结果表明:盾构隧道下穿框架涵,框架涵的横向沉降和纵向沉降呈“W”形,从沉降曲线整体来看,沉降曲线呈“双蝶状”曲线,掘进过程中框架涵沉降峰值为1.805 mm;盾构机穿越路基和隧道贯通时会引起路基沉降的突变,随着开挖的进行,路基沉降会产生沉降峰值的转移,路基沉降的峰值为1.753 mm;高铁轨道沉降曲线随着开挖呈现单个峰值且沉降槽的宽度与框架桥宽度大致相同,轨道沉降的峰值为1.41 mm;通过分析8种盾构掘进压力和8种注浆压力对路基沉降的影响规律,可见,注浆压力较掘进压力对沉降的具有较好的控制效果,并且随着注浆压力的提升,路基表面沉降峰值在减小,注浆压力为800kPa时,路基表面沉降峰值为1.355 mm,变形率最大为20.7%,经分析,将盾构机的注浆压力和掘进压力分别设置为400 kPa和100 kPa。

    Abstract:

    The crossing of the shield tunnel through the high-speed railway will have an impact on the settlement of railway tracks, roadbeds and other structures, and seriously affect the operation of the high-speed railway. In order to study the influence of shield tunnel crossing high-speed railway on frame box culvert, roadbed and high-speed rail track settlement. Relying on Guiyang Rail Transit Line 3, a model of soil layer, frame culvert, track bed, and track was established, and the influence of shield tunneling in limestone on frame culvert, existing high-speed rail track and roadbed was analyzed. The results show that the transverse and longitudinal settlement of the frame culvert are "W" shaped, and the settlement curve is a "double butterfly" curve from the overall perspective of the settlement curve, and the peak settlement value of the frame culvert is 1.805 mm during the tunneling process. When the shield machine crosses the subgrade and the tunnel penetration, it will cause a sudden change in the subgrade settlement, and with the progress of excavation, the subgrade settlement will produce the transfer of the peak settlement value, and the peak value of the subgrade settlement is 1.753 mm. The track settlement curve of high-speed rail shows a single peak with excavation, and the width of the settlement groove is about the same as the width of the frame bridge, and the peak value of track settlement is 1.41 mm. By analyzing the influence of 8 kinds of shield tunneling pressure and 8 kinds of grouting pressure on subgrade settlement, it is found that the grouting pressure has a better control effect on settlement than the excavation pressure, and with the increase of grouting pressure, the peak value of subgrade surface settlement is decreasing, when the grouting pressure is 800kPa, the peak value of subgrade surface settlement is 1.355 mm, and the maximum deformation rate is 20.7%, and the grouting pressure and tunneling pressure of the shield machine are set to 400 kPa and 100 kPa respectively

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杨超,刘远明,刘凯,等. 贵阳地铁盾构隧道下穿高速铁路沉降规律研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-07
  • 最后修改日期:2024-05-25
  • 录用日期:2024-05-29
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