Accumulated damage failure mechanism of anchoring structures under cyclic impact disturbance

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外文摘要：Cyclic impact induces ongoing fatigue damage and performance degradation in anchoring structures,ser-ving as a critical factor leading to the instability of deep roadways.This paper takes the intrinsic spatio-temporal relationship of macro-microscopic cumulative damage in anchoring structures as the main thread,revealing the mechanism of bearing capacity degradation and progressive instability of anchoring structure under cyclic impact.Firstly,a set of impact test devices and methods for the prestressed solid anchor bolt anchoring structure were developed,effectively replicating the cyclic impact stress paths in situ.Secondly,cyclic impact anchoring structure tests and simulations were conducted,which clarifies the damage evolution mechanism of the anchoring structure.Prestress loss follows a cubic decay func-tion as the number of impacts increases.Under the same impact energy and pretension force,the impact resistance cycles of extended anchoring and full-length anchoring were increased by 186.7％ and 280％,respectively,compared to end anchoring.The rate of internal damage accumulation is positively corre-lated with impact energy and negatively correlated with anchorage length.Internal tensile cracks account for approximately 85％.Stress transmission follows a fluctuating pattern.Compared to the extended anchoring,the maximum vibration velocity of the exposed end particles in the full-length anchoring was reduced by 59.31％.Damage evolution exhibits a pronounced cumulative mutation effect.Then,a three-media,two-interface mechanical model of the anchoring structure was constructed.It has been clarified that the compressive stress,tensile stress,and oscillation effect arising from rapid transi-tions between compression and tension are the primary internal factors responsible for the degradation of the anchoring structure's bearing capacity.Finally,the progressive instability mechanism of the anchoring structure under cyclic impact was elucidated.The mutual feedback and superposition of media rupture,interface debonding,and bearing capacity degradation result in overall failure.The failure pro-cess involves stages dominated by oscillation-compression,tensile stress,and compression failure.A tar-geted control strategy was further proposed.This provides a reference for maintaining the long-term stability of deep roadways under dynamic impact loads.

外文关键词：

Cyclic impactAnchoring structureCumulative damageBearing capacity degradationProgressive instability

作者：

Peng Wang、Nong Zhang、Jiaguang Kan、Qun Wei、Zhengzheng Xie、Aoran Li、Zhe He、Jinghua Qi、Xingliang Xu、Changrui Duan

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作者单位：

School of Mines,China University of Mining and Technology,Xuzhou 221116,China

Key Laboratory of Deep Coal Resource Mining (CUMT),Ministry of Education,China University of Mining and Technology,Xuzhou 221116,China

School of Mechanical Engineering,Jiangsu University of Technology,Changzhou 213001,China

State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China

State Key Laboratory for Safe Mining of Deep Coal and Environmental Protection,Huainan 232001,China

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出版年：

2024

DOI：

10.1016/j.ijmst.2024.11.006

矿业科学技术学报(英文版)

中国矿业大学

矿业科学技术学报(英文版)

CSTPCDEI

影响因子：1.222

ISSN：2095-2686

年,卷(期)：2024.34(12)