不同地层与平立面关系下盾构下穿对高铁的影响及分区研究
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1.天津大学;2.中国铁路设计集团有限公司;3.天津市地下铁道集团有限公司

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U455.43

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国家自然科学基金(52178343);中国国家铁路集团有限公司科技研究开发计划(N2020G009)


Study on plane elevation relationship and influence scope of high-speed railway infrastructure under shield tunneling
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Tianjin University

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    摘要:

    盾构下穿高铁基础设施工程出现地愈加频繁,但针对盾构下穿高铁基础设施工程引起的变形的规律研究仍较少且不系统,同时,盾构下穿对高铁基础设施影响的分区也缺少较为精细、成熟、实用的成果。本文依托下穿高铁路基、隧道案例,利用数值模拟开展系统性参数研究,结合正交试验与单因素变量分析,对盾构下穿高铁基础设施工程影响规律以及影响范围分区进行了研究。研究认为,设计下穿角度时,应充分考虑对高铁水平不平顺对主要影响区范围的影响,且将角度最好控制在40°以上;随着盾构与待穿隧道间净距增大,影响范围逐渐扩大,最大沉降、轨道高低不平顺、水平不平顺逐渐减小;随着地层越来越软弱,最大沉降逐渐增长,影响范围逐渐扩大;针对不同地层条件的高铁隧道、路基,分别给出了盾构与高铁基础设施之间的合理净距建议。为了便于工程中判断盾构下穿对高铁的影响范围,基于大量模拟结果,进行相近土层、埋深归并,提出了七种地层在五种埋深下的影响区划分,可为盾构下穿高铁工程提供参考。

    Abstract:

    Shield tunneling through high-speed railway infrastructure projects is becoming increasingly frequent, but the research on the laws of deformation caused by shield tunneling through high-speed railway infrastructure projects is still rare and unsystematic. The zoning of the impact of shield tunneling on high-speed railway infrastructure is also lacking in more detailed, mature, and practical results. Based on the case study of underpass high-speed railway subgrade and tunnel, this paper uses numerical simulation to carry out systematic parameter research, combined with orthogonal tests and single factor variable analysis, to study the impact law and impact area zoning of shield tunneling underpass high-speed railway infrastructure engineering. The study suggests that when designing the underpass angle, the impact of horizontal irregularities on the main impact area should be fully considered, and the angle should preferably be controlled above 40 °. As the clear distance between the shield and the tunnel to be penetrated increases, the scope of influence gradually expands, and the maximum settlement, track height irregularities, and horizontal irregularities gradually decrease. As the stratum becomes weaker and weaker, the maximum settlement gradually increases, and the impact scope gradually expands. For high-speed railway tunnels and subgrades with different stratum conditions, reasonable clear distance between shield and high-speed railway infrastructure is proposed. In order to facilitate the judgment of the impact scope of shield tunneling on high-speed railway in engineering, based on a large number of simulation results, the impact area division of seven strata under five burial depths is proposed by merging similar soil layers and burial depths, which can provide reference for shield tunneling on high-speed railway projects.

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程雪松,赵林嵩,吴薪柳,等. 不同地层与平立面关系下盾构下穿对高铁的影响及分区研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-06-27
  • 最后修改日期:2024-05-03
  • 录用日期:2024-05-15
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