拉应力和剪应力耦合作用下竹钢复合锚杆的锚固机理

IF 3.8 Q2 ENVIRONMENTAL SCIENCES Geoenvironmental Disasters Pub Date : 2024-01-02 DOI:10.1186/s40677-023-00258-1
Feifan Ren, Qiangqiang Huang, Guan Wang, Zhuang Li
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引用次数: 0

摘要

土遗址具有很高的文化和科学价值。然而,大多数土遗址已遭到严重破坏,急需修复。为解决这一问题,一种新型锚杆--竹钢复合锚杆(BSCR)被提出并广泛应用于土遗址保护。然而,对竹钢复合锚杆锚固机理的研究却落后于工程实践,尤其是在拉应力和剪应力耦合作用下的行为。本研究以离心试验结果为基础,建立并验证了一个数值模型,并对传统锚杆(CR)和 BSCR 的锚固机理进行了比较分析。系统地研究了各种参数,包括锚杆直径、弯曲刚度、倾角和长度,以阐明它们对保护效果的影响。BSCR 具有更大的直径和弯曲刚度,在保护土遗址方面优于 CR。此外,减小锚杆倾角和增加锚杆层数可减少拉应力和剪应力耦合效应引起的边坡变形。增加 BSCR 的长度可以提高锚固边坡的稳定性,但由于受锚杆有效锚固长度的影响,过长的锚杆长度效率不高。这些研究成果为 BSCR 在土质场地保护中的应用提供了宝贵的见解,并为进一步研究其在复杂应力条件下的锚固机理提供了参考。
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Anchorage mechanism of bamboo-steel composite rockbolts subjected to the coupled effect of tensile and shear stress
Earthen heritage sites have high cultural and scientific value. However, most of earthen heritage sites have been severely damaged and are in urgent need of restoration. To address this issue, a novel rockbolt, bamboo-steel composite rockbolt (BSCR), was proposed and widely employed in earthen site protection. However, the research on the anchorage mechanism of BSCR lags behind engineering practice, particularly with regard to its behavior under the coupled effect of tensile and shear stress. In this study, based on centrifugal test results, a numerical model was established and validated and a comparative analysis of the anchorage mechanism between conventional rockbolt (CR) and BSCR was also conducted. Various parameters, including rockbolt diameter, bending stiffness, inclination angle, and length, were systematically investigated to elucidate their influence on protective efficacy. BSCR has a larger diameter and bending stiffness, and is superior to CR in protecting earthen heritage sites. In addition, reducing the rockbolt inclination angle and increasing the number of rockbolt layers can reduce slope deformation caused by the coupling effect of tensile and shear stress. Increasing the length of BSCR can enhance the stability of the anchored slopes; however, due to the influence of the effective anchorage length of the rockbolt, excessively extending the rockbolt length is inefficient. These research results provide valuable insights into the application of BSCR in earthen site protection and can provide a reference for further research on its anchorage mechanism under complex stress conditions.
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来源期刊
Geoenvironmental Disasters
Geoenvironmental Disasters Social Sciences-Geography, Planning and Development
CiteScore
8.90
自引率
6.20%
发文量
22
期刊介绍: Geoenvironmental Disasters is an international journal with a focus on multi-disciplinary applied and fundamental research and the effects and impacts on infrastructure, society and the environment of geoenvironmental disasters triggered by various types of geo-hazards (e.g. earthquakes, volcanic activity, landslides, tsunamis, intensive erosion and hydro-meteorological events). The integrated study of Geoenvironmental Disasters is an emerging and composite field of research interfacing with areas traditionally within civil engineering, earth sciences, atmospheric sciences and the life sciences. It centers on the interactions within and between the Earth''s ground, air and water environments, all of which are affected by climate, geological, morphological and anthropological processes; and biological and ecological cycles. Disasters are dynamic forces which can change the Earth pervasively, rapidly, or abruptly, and which can generate lasting effects on the natural and built environments. The journal publishes research papers, case studies and quick reports of recent geoenvironmental disasters, review papers and technical reports of various geoenvironmental disaster-related case studies. The focus on case studies and quick reports of recent geoenvironmental disasters helps to advance the practical understanding of geoenvironmental disasters and to inform future research priorities; they are a major component of the journal. The journal aims for the rapid publication of research papers at a high scientific level. The journal welcomes proposals for special issues reflecting the trends in geoenvironmental disaster reduction and monothematic issues. Researchers and practitioners are encouraged to submit original, unpublished contributions.
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