Effects of shield construction on dynamic characteristics and deformation of interlayer soil: A case study in Changchun, China

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL Bulletin of Engineering Geology and the Environment Pub Date : 2024-10-09 DOI:10.1007/s10064-024-03939-9

Boyu Jiang, Haibin Wei, Dongsheng Wei, Zipeng Ma, Fuyu Wang

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Abstract

Shield tunneling can cause deformation of the interlayer soil. Traditional static methods do not consider the shield dynamic load and the construction influence on the dynamic performance of interlayer soil, resulting in inaccurate results. Therefore, this paper proposes a dynamic analysis method to assess soil deformation. Firstly, the composition and stress state of interlayer soil were monitored on site. Secondly, the dynamic triaxial tests were conducted based on the monitoring results to analyze the soil dynamic characteristics. Then, a dynamic constitutive model of the interlayer soil was constructed, which considers the change of the dynamic performance. Finally, the dynamic effect of shield on soil is simulated based on viscoelastic mechanics, and the dynamic analysis of interlayer soil deformation is realized by three-dimensional finite element method. The results indicate that the interlayer soil near the excavation face is more significantly affected during the crossing stage. Shield construction increases the dynamic strength and dynamic modulus of the interlayer soil, while reducing the damping ratio. The Hardin-Drnevich model and the logarithmic-linear model can well describe the evolution laws of dynamic modulus and dynamic strength. The dynamic analysis method is closer to real construction and has higher prediction accuracy.

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盾构施工对层间土壤动力特性和变形的影响：中国长春案例研究

盾构掘进会引起层间土体变形。传统的静态方法没有考虑盾构动荷载和施工对夹层土动态性能的影响，导致结果不准确。因此，本文提出了一种动态分析方法来评估土体变形。首先，现场监测了夹层土的成分和应力状态。其次，根据监测结果进行动态三轴试验，分析土壤动态特性。然后，构建了考虑动力性能变化的层间土动力构成模型。最后，基于粘弹性力学模拟了盾构对土体的动力效应，并通过三维有限元法实现了层间土体变形的动力分析。结果表明，在穿越阶段，靠近开挖面的层间土受到的影响更大。盾构施工提高了层间土的动强度和动模量，同时降低了阻尼比。Hardin-Drnevich 模型和对数线性模型可以很好地描述动模量和动强度的演变规律。动态分析方法更接近实际施工情况，预测精度更高。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.