基于三维强度准则的屈服隧道支护与应变软化岩体之间的相互作用

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Chen Xu, Caichu Xia
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引用次数: 0

摘要

屈服-抵抗 "组合支护措施是软岩隧道中广泛采用的一种控制措施,用于控制大变形,尤其是在高地质应力条件下。对于应变软化岩体,塑性区的强度参数与支护反应是耦合的。由于屈服支护与应变软化围岩之间相互作用机制的复杂性,目前大多数解决方案都是基于平面应变模型。然而,隧道的推进是一个三维问题。因此,在分析应变软化岩石和屈服支护的力学行为时,纵向效应值得讨论。本文基于广义张柱强度准则,提出了一种新的两阶段方法来描述应变软化岩体与屈服支护之间的相互作用。首先,提出了屈服支撑结构的简化力学模型,以描述围岩和支撑的力学响应。随后,考虑到纵向效应,提出了三维地基与支撑相互作用的半解析解。将所提方案的结果与有限元模拟的结果进行了比较,发现两者的结果高度一致。最后,讨论了不同屈服支撑的力学行为。研究结果表明,通过屈服技术推迟支撑时间是至关重要的,否则支撑将承受非常大的荷载。通过实施 "控制-屈服-抵抗"(CYR)支撑,可以显著减少支撑反应的第二阶段。这项研究为研究高地质应力条件下围岩与各种隧道支护之间的三维相互作用提供了新的见解和方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Interaction between yielding tunnel support and strain-softening rock mass based on the three-dimensional strength criterion

Interaction between yielding tunnel support and strain-softening rock mass based on the three-dimensional strength criterion

The “yield-resist” combined support measure is a widely employed control measure in soft rock tunnels for controlling large deformation, particularly in high geostress conditions. For strain-softening rock masses, the strength parameters in the plastic zone are coupled with the support reaction. Due to the complexity of the interaction mechanism between yielding support and strain-softening surrounding rock, the majority of current solutions are based on the plane–strain model. However, the advancement of the tunnel is a three-dimensional problem. Therefore, the longitudinal effect is worthy of discussion when analyzing the mechanical behaviors of strain-softening rock and yielding support. A new two-stage method is proposed to describe the interaction between strain-softening rock mass and yielding support based on the generalized Zhang–Zhu (GZZ) strength criterion. Firstly, a simplified mechanical model of the yielding support structure is suggested to describe the mechanical response of the surrounding rock and support. Subsequently, a semi-analytical solution to three-dimensional ground–support interaction is proposed, taking into account the longitudinal effect. The results of the proposed solution are compared with those of a finite element simulation, and a high degree of agreement is observed. Finally, the mechanical behaviors of different yielding supports are discussed. The findings indicate that postponing the support timing by means of yielding technologies is essential, as otherwise the support would bear a very large load. The second stage of support reaction can be significantly reduced by implementing the “control-yield-resist” (CYR) support. The research offers novel insights and methodologies for investigating the three-dimensional interaction between the surrounding rock and various tunnel supports in high geostress conditions.

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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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