首页|双线盾构隧道开挖引起既有铁路路基沉降及盾构掘进参数研究:工程案例

双线盾构隧道开挖引起既有铁路路基沉降及盾构掘进参数研究:工程案例

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为揭示盾构掘进参数对既有铁路路基沉降的影响规律，本文依托北京地铁16号线丰益桥南站至丰台站双线盾构隧道下穿既有铁路线路工程进行案例分析。将盾构掘进过程分为盾构穿越前、盾构穿越中和盾构穿越后三个阶段。实测数据表明，路基沉降在盾构穿越前逐渐增大，在盾构穿越过程中急剧增大，在盾构穿越后趋于稳定。将盾构管片及时封闭成环，施作补偿注浆、二次注浆，有利于控制路基沉降。此外，盾构掘进参数对控制路基沉降具有至关重要的作用。研究结果表明:盾构掘进速度越快引起的路基沉降越大，继而引起较大的土仓压力，并伴随刀盘扭矩和盾构总推力的骤减;由于盾构过程中出土量易于控制，因此其对路基沉降影响不大;然而，如果同步注浆量控制不当，将导致既有路基向上隆起。本研究为盾构开挖下穿多条既有铁路线路引起的路基变形控制以及盾构掘进参数设置提供参考和指导。
Subgrade settlements of existing railway lines and operational parameters of shield machine induced by twin shield tunnel excavations:A case study
This paper presents a case study on the subgrade settlements of four national railway lines induced by twin shield tunnel excavations.The development characteristics of subgrade settlements can be divided into three stages.The monitoring data indicate that subgrade settlements increase gradually before the shield machine crossing the monitoring region,then increase sharply during the shield machine crossing,and finally approach to be stable after the shield machine crossing.Immediately splicing the segments into rings,implementing the compensation and secondary grouting facilitate the control of subgrade settlements.Operational parameters play a crucial role in controlling the subgrade settlements.The effects of the operational parameters of the shield machine on the subgrade settlements are analyzed.The investigation reveals that excessive shield driving velocity causes large subgrade settlements,accompanied by the sudden reduction of rotation torque and total thrust.The excavated earth volume affects the subgrade settlements insensitively because of its easily controlling.Synchronous grouting volume can rise the existing subgrade if not controlled appropriately.Great subgrade settlements cause large earth pressures to be exerted at the chamber.Some valuable references and guidance are given through this paper for the operational parameter setting of shield machines and deformation control of multiple railway lines due to the shield tunnel excavation beneath.

subgrade settlementoperational parameters of shield machineexisting railway linesshield tunnel

刘翔、张瑞、房倩、李倩倩、姜谙男、黎奎辰

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College of Transportation Engineering,Dalian Maritime University,Dalian 116026,China

Key Laboratory of Urban Underground Engineering of Ministry of Education,Beijing Jiaotong University,Beijing 100044,China

Beijing Urban Rapid Transit Construction Administration Corp.,Beijing 100068,China

路基沉降 盾构掘进参数 既有铁路 盾构隧道

National Natural Science Foundation of ChinaPostdoctoral Research Foundation of ChinaPostdoctoral Research Foundation of ChinaKey Laboratory of Urban Underground Engineering of Ministry of Education,ChinaLiaoning Revitalization Talents Program,Chinakey Project of Liaoning Education Department,China

521083632021M7006542023T160074TUL2022-01XLYC1905015LJKZZ20220003

2024

10.1007/s11771-023-5447-9

中南大学学报(英文版)
中南大学

中南大学学报(英文版)

CSTPCDEI
影响因子：0.47
ISSN：2095-2899
年,卷(期)：2024.31(1)
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