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热力管线盾构隧道下穿铁路区
地表沉降影响研究
魏 峰
(中国铁路呼和浩特局集团有限公司,呼和浩特 010030)
[摘 要 ] 盾构隧道下穿既有铁路掘进施工会引起地基变形及轨道不均匀沉降问题,影响隧道施工和铁
路安全运营。为研究盾构隧道掘进过程中对地表变形的影响,依托热力管线下穿京铁路线工程开展研究,
采用离心机试验模拟了盾构隧道施工过程中对地表变形的影响。研究结果表明,盾构施工对路基的影响主
要集中于25 m范围内,超出该范围的影响可忽略不计;盾构施工过程中,下穿铁路前,路基沉降占整个施
工过程引起沉降变形的 36%左右,下穿后约占 64%;以盾构下穿铁路铁线 15 m为界, 15 m之前,掘进方向左
侧路基沉降大于右侧;15 m之后,掘进方向右侧路基变形大于左侧。研究可为相关工程提供科学依据。
[关键词 ] 盾构隧道;地表沉降;离心机;铁路
[中图分类号]
TU 753 [文献标志码] B [文章编号] 1001
-523X
(2022
)15
-0141
-03
study on the influenCe of Ground settlement in railway area under thermal pipeline shield tunnel
Wei Feng
[abstract
]
The excavation of the shield tunnel under the existing railway will cause the problems of
foundation deformation and uneven settlement of the track, which will affect the safe operation of the railway. In
order to study the influence on the surface deformation during the excavation of large-diameter shield tunnels, this
paper relies on the thermal pipeline to pass through the Beijing-Baobao railway line, and uses a centrifuge test to
simulate the shield tunnel construction process.The research results show that the impact of shield construction on
the subgrade is mainly concentrated in the range of 25 m, and the impact beyond the modified range can be ignored.
During the shield construction process, before going down the railway, the settlement of the subgrade accounts for
36% of the settlement deformation caused by the entire construction process. Left and right, about 64% after going
down; taking the shield tunnel penetrating the railway 15 m as the boundary, the subgrade settlement on the left side
in the tunneling direction is greater than that on the right side before 15 m. The research in this paper can provide
scientific basis for related projects.
[Keywords
]
shield tunnel; surface settlement; centrifuge; railway
随着我国高速铁路的快速发展,铁路干线纵横
交错,不可避免地会出现新建地下隧道接近或者下穿
铁路干线的情况。目前,关于隧道开挖主要的方法是
盾构法,但盾构施工过程中经常会出现地表、轨道变
形,影响施工及铁路的安全运营。盾构开挖引起的地
表和轨道变形的研究方法有试验方法、Peck经验公式
以及数值模拟方法。王鸣涛等
[1]基于Peck经验公式研
究了盾构施工过程中地表位移的变形,并结合现场监
测数据提出了修正模型。郑余朝
[2]对盾构开挖引起的
地表变形进行了预测研究。吴韬
[3]建立了三维数值模
型,研究了超大直径隧道在盾构掘进过程中的地层变
形规律,提出了采用注浆进行变形控制。朱正国
[4]建
立了数值有限元模型,提出了不同条件下地表沉降控 制标准的判别。在物理模型试验研究方面,柴元四
[5]
给出控制小直径隧道开挖引起的地表变形防护措施。
马险峰等
[6]基于离心机模型
热力管线盾构隧道下穿铁路区地表沉降影响研究(论文).pdf