Laboratory tests to understand tephra sliding behaviour on roofs

Q1 Social Sciences

Journal of Applied Volcanology Pub Date : 2023-11-06 DOI:10.1186/s13617-023-00137-2

Sara Osman, Mark Thomas, Julia Crummy, Anna Sharp, Steve Carver

引用次数: 0

Abstract

Abstract Following explosive eruptions, loading from tephra fall deposits can lead to roof collapse. However, the load may be reduced significantly by tephra sliding on pitched roofs. We present small-scale laboratory tests to investigate tephra sliding behaviour on metal, fibre cement sheet and tile roofing. We tested 10–30 cm thicknesses for dry and wet deposits of pumice, scoria and basaltic ash. We found that tephra did not slide on roof pitches ≤ 15° for coarse-grained deposits and ≤ 12° for dry ash. Thin deposits of wet ash were stable at pitches ≤ 30°. In addition, tephra was mainly shed on pitches ≥ 32° for metal roofs and ≥ 35° for fibre cement and tiles. Using these results, we have produced an initial set of sliding coefficients for tephra for simply pitched roofs that can be used to help prioritise roofs for clearing during an eruption and assist in designing roofs to withstand tephra fall.

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实验室测试以了解瘟热在屋顶上的滑动行为

摘要在爆发性火山喷发后，来自火山落层沉积物的载荷可能导致顶板坍塌。然而，通过在坡屋顶上滑动，载荷可能会显著降低。我们提出了小规模的实验室测试，以调查tephra在金属，纤维水泥板和瓦片屋顶上的滑动行为。我们测试了10-30厘米厚度的浮石、矿渣和玄武岩灰的干湿沉积物。我们发现，在坡度≤15°(粗粒沉积物)和≤12°(干灰)的条件下，天牛不发生滑动。湿灰薄层在沥青≤30°时较为稳定。此外，在≥32°的金属屋顶和≥35°的纤维水泥和瓦片屋顶上，主要在坡度上脱落。利用这些结果，我们已经为简单的倾斜屋顶产生了一组初始的tephra滑动系数，可以用来帮助在火山喷发期间优先清理屋顶，并协助设计屋顶以承受tephra下降。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Applied Volcanology Earth and Planetary Sciences-Geophysics

CiteScore

4.10

自引率

0.00%

发文量

审稿时长

13 weeks

期刊介绍： Journal of Applied Volcanology is an international journal with a focus on applied research relating to volcanism and particularly its societal impacts. Characterising volcanic impacts and associated risk relies on not only quantifying physical threat but also understanding social and physical vulnerability and resilience. The broad aim of volcanologists in this domain is to increase public resilience to volcanic risk via research that reduces both human fatalities and volcanic impacts on livelihoods, infrastructure, and the economy. Journal of Applied Volcanology fills an important gap for scientists who want to publish research that addresses this aim and wish to reach a broad audience. The journal has a holistic view of the relationship between volcanoes and society, and therefore welcomes intra- cross- multi- inter- and transdisciplinary articles that deal with volcanoes and society. Research topics covered by the journal include: the impacts of eruptions on communities; methods for risk analysis; risk management; community preparedness, response to and recovery from volcanic hazard events; health issues related to volcanism; social adaptation to volcanic hazards; policy and institutional aspects of volcanic risk management; applications of physical volcanology, geophysics and remote sensing to volcanic crisis mitigation. The journal aims for rapid publication of high-impact research and review papers.