Investigation on dynamic response of rockfall net fences under irregular block impact

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics Pub Date : 2025-08-05 DOI:10.1016/j.trgeo.2025.101661

Junyi He , Aiguo Xing , Yufang Zhang , Kun Yuan , Jian Cui , Bo Liu

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引用次数: 0

Abstract

Rockfalls frequently occur in the mountainous area, posing significant risks to public transportation and the safety of people’s lives and property. Rockfall net fences are commonly used to mitigate and prevent rockfall incidents. Through field investigations of blocks within a 100-meter range of rockfall net fences, it is found joint-fractured octahedron takes the majority portion. Numerical model without substitution on ring net is established and validated compared with a conducted full-scale experiment, and dynamic response of rockfall net fence by the octahedral impactors with sphericity values ranging from 0.5 to 0.8 is explored. The results indicated that impactors with sharp shapes produce fewer rings during the impact moment, leading to stress concentration and causing higher stress on rings. It is inferred that design the rockfall protection system with traditional test impactor tend to be more unsafe and may cause localized failure and fence penetration when suffering a sharp block impact even the impact energy is lower than the capacity.

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不规则块体冲击下落石网围栏动力响应研究

山区经常发生岩崩，对公共交通和人民生命财产安全构成重大威胁。落石网围栏通常用于减轻和防止落石事故。通过对落石网栅栏100米范围内块体的现场调查，发现节理断裂八面体占多数。建立了环网不替换的数值模型，并与已进行的全尺寸试验进行了对比验证，探讨了球度为0.5 ~ 0.8的八面体冲击物对落石网围栏的动力响应。结果表明，形状锋利的冲击器在冲击时刻产生较少的环，导致应力集中，对环产生较大的应力。由此推断，采用传统的试验冲击器设计岩崩防护系统更不安全，即使冲击能量低于其承受能力，也可能在遭受尖锐的块体冲击时造成局部破坏和穿墙。

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来源期刊

Transportation Geotechnics Social Sciences-Transportation

CiteScore

8.10

自引率

11.30%

发文量

194

审稿时长

51 days

期刊介绍： Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.