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1.北京工业大学岩土与地下工程研究所, 北京 100124
2.北京工业大学城市与工程安全减灾教育部重点实验室, 北京 100124
Received:28 March 2024,
Revised:2024-05-05,
Published:28 June 2025
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路德春,宋涛,林庆涛等.盾构下穿施工既有隧道变形机理数值模拟研究[J].防灾减灾工程学报,2025,45(03):485-500.
LU Dechun,SONG Tao,LIN Qingtao,et al.Numerical Simulation Study on Deformation Mechanism of Existing Tunnels Induced by Shield Under‑crossing[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(03):485-500.
路德春,宋涛,林庆涛等.盾构下穿施工既有隧道变形机理数值模拟研究[J].防灾减灾工程学报,2025,45(03):485-500. DOI: 10.13409/j.cnki.jdpme.20240328002.
LU Dechun,SONG Tao,LIN Qingtao,et al.Numerical Simulation Study on Deformation Mechanism of Existing Tunnels Induced by Shield Under‑crossing[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(03):485-500. DOI: 10.13409/j.cnki.jdpme.20240328002.
盾构施工下穿既有运营隧道,易导致既有线路变形过大,给地铁列车运营安全带来安全隐患。考虑盾构机与土体相互作用、衬砌‑注浆层‑土体相互作用,以及同步注浆硬化过程和压力消散等关键因素,发展了盾构施工全过程数值模拟方法。结合实际工程建立盾构下穿既有隧道三维有限元数值模型,获
得了盾构下穿过程中既有隧道结构变形、内力响应、围岩压力,及其周围地层应力的发展变化规律,揭示了既有隧道的变形机理。结果表明:既有隧道在纵向上发生挠曲和扭转变形,挠曲变形呈现为中部沉降两端隆起的“V”形变形,断面扭转变形呈中间大两端小的分布形式,且随盾构掘进先逆时针扭转后顺时针扭转;对于隧道横断面,在
x
=-0.8
D
~0.8
D
隧道断面呈现侧向压扁、竖向伸长的变形模式,在
x
=±0.8
D
之外隧道断面呈现侧向伸长、竖向压扁的变形模式,
x
=-0.8
D
~0.8
D
隧道断面变形由盾构开挖引起的土体卸载引起,
x
=±0.8
D
之外的隧道断面变形由中间区域隧道断面扭转和沉降变形的传递导致。
Shield tunneling under-crossing existing operational tunnels can easily cause excessive deformation of existing lines
posing safety risks to subway train operations. By considering the key factors such as shield-soil interaction
lining-grouting layer-soil interaction
as well as synchronous grout hardening process and pressure dissipation
we developed a numerical simulation method for the entire shield construction process. Based on an actual project
a 3D finite element numerical model of shield tunneling underneath existing tunnels was established. The evolutionary patterns of structural deformation
internal force response
surrounding rock pressure and adjacent stratum stresses during shield undercrossing were obtained
revealing the deformation mechanism of existing tunnels. The results showed that the existing tunnel underwent both flexural and torsional deformations longitudinally. The flexural deformation exhibited a V-shaped pattern with middle-section settlement and end-section uplift. Sectional torsional deformation showed greater magnitude in the middle sections than at the ends
initially twisting counterclockwise then clockwise during shield advancement. For tunnel cross-sections
within the range of
x
=-0.8
D
to 0.8
D
sections demonstrated lateral flattening and vertical elongation deformation patterns. Beyond
x
=±0.8
D
sections exhibited lateral elongation and vertical flattening deformation pa
tterns. Deformations within the range of
x
=-0.8
D
to 0.8
D
resulted from soil unloading induced by shield excavation. Deformations beyond
x
=±0.8
D
were caused by transmission of torsional and settlement deformations from central sections.
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