首页|结合稀疏多项式混沌展开的地震盾构隧道掌子面三维拟动力可靠度分析

结合稀疏多项式混沌展开的地震盾构隧道掌子面三维拟动力可靠度分析

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为解决城市和海底隧道建设中遇到的地震隧道掌子面稳定性难题，提出了地震条件下盾构隧道掌子面的高效可靠度分析框架。在极限分析上限理论的基础上，考虑到土壤强度参数的非均质分布特性，提出了一种改进的三维离散确定性机制来评估地震掌子面的稳定性。将稀疏多项式混沌扩展法(SPCE)与修正拟动力法(MPD)相结合，构建隧道掌子面破坏概率评估的替代模型。通过与已发表的文献和数值模拟结果进行比较，验证了改进的确定性模型，并将SPCE-MPD替代模型与传统的MCS方法进行了检验。在SPCE-MPD替代模型的基础上，分析了地震效应对掌子面破坏概率和可靠性指数的影响，并进行了全局敏感性分析(GSA)，以反映地震作用参数的影响顺序。最后通过成都外环隧道的工程案例检验了所提出方法的有效性。结果表明，在地震烈度较高的地区，地震反应对隧道掌子面稳定性的不确定性较大，而地震波速度的变化对隧道掌子面稳定性的影响最大。
Three-dimensional pseudo-dynamic reliability analysis of seismic shield tunnel faces combined with sparse polynomial chaos expansion
To address the seismic face stability challenges encountered in urban and subsea tunnel construction,an efficient probabilistic analysis framework for shield tunnel faces under seismic conditions is proposed.Based on the upper-bound theory of limit analysis,an improved three-dimensional discrete deterministic mechanism,accounting for the heterogeneous nature of soil media,is formulated to evaluate seismic face stability.The metamodel of failure probabilistic assessments for seismic tunnel faces is constructed by integrating the sparse polynomial chaos expansion method(SPCE)with the modified pseudo-dynamic approach(MPD).The improved deterministic model is validated by comparing with published literature and numerical simulations results,and the SPCE-MPD metamodel is examined with the traditional MCS method.Based on the SPCE-MPD metamodels,the seismic effects on face failure probability and reliability index are presented and the global sensitivity analysis(GSA)is involved to reflect the influence order of seismic action parameters.Finally,the proposed approach is tested to be effective by a engineering case of the Chengdu outer ring tunnel.The results show that higher uncertainty of seismic response on face stability should be noticed in areas with intense earthquakes and variation of seismic wave velocity has the most profound influence on tunnel face stability.

reliability analysisshield tunnel facesparse polynomial chaos expansionmodified pseudo-dynamic approachseismic stability assessment

郭风琪、李世伟、邹金锋

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School of Civil Engineering,Central South University,Changsha 410075,China

可靠度分析 盾构隧道掌子面 稀疏多项式混沌扩展 修正拟动力法 地震稳定性评估

Guizhou Provincial Science and Technology Major Project,China

[2018]3010

2024

10.1007/s11771-024-5698-0

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(6)