The elastoplastic semi-analytic solution of a timely active support technique using NPR bolts for deeply-buried tunnels

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis Pub Date : 2025-03-03 DOI:10.1016/j.engfailanal.2025.109477

Hongru Li , Manchao He , Yingming Xiao , Shulin Ren , Congling Shi

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引用次数: 0

Abstract

The timely active support technique using high-strength, high-toughness negative Poisson’s ratio (NPR) bolts as the key material (NPR-TAST) has a positive effect on disaster control in deeply buried tunnels. In this study, based on the finite difference method, a semi-analytical solution for NPR-TAST is proposed to investigate the effect of NPR bolts on ground reactions. The stress relief coefficient method is adopted to simulate the unloading process and the interaction process between the bolts and surrounding rock. Once the bolt deformation exceeds the set maximum value, the bolt would break. The proposed solution is validated by the previous semi-analytical and numerical solutions. The results show that, under large deformation conditions, conventional bolts tend to break. In contrast, NPR bolts can continuously deform with the surrounding rock, enhancing the bearing capacity of the surrounding rock. The key factors of NPR-TAST, including support timing, pre-stress magnitude, and constant resistance value of NPR bolts, are discussed. Early application of higher pre-stressed NPR bolts and increasing the constant resistance value of these bolts can more effectively control surrounding rock deformation and failure. The research results can provide guidance for the application of NPR-TAST in deeply buried tunnels.

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来源期刊

Engineering Failure Analysis 工程技术-材料科学：表征与测试

CiteScore

7.70

自引率

20.00%

发文量

956

审稿时长

47 days

期刊介绍： Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies. Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials. Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged. Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.