Project: Statics of drystone walls

Engineered dry stone masonry

Many people imagine dry stone walls to be small, relatively unstable structures of rural culture, as they are known from terracing or free-standing pasture walls. For them, dry stone walls are a building technique that can no longer keep up with our modern times and today's technical requirements.  However, dry stone walls are also able to withstand great loads and can be dimensioned according to engineering standards.

Numerous dry-stone retaining walls still support railway lines in Switzerland today.

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The large drystone masonry avalanche barriers in the Swiss Alps still protect villages, roads and railway lines today.

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These dry-walled structures date from the end of the 19th century, when new, larger roads were built across the Alps in the course of the industrial revolution, and shortly afterwards also railways. Because cement and concrete had only just been invented and transport was almost impossible in the difficult-to-access terrain, people were dependent on using the stone available on site as a building material. The numerous retaining walls that were necessary for the construction of the road and railway routes were built as natural stone walls, often as mortar masonry, but where possible also as dry masonry.

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The origins of engineered dry-stone walling probably date back to the Age of Enlightenment, when military engineers in France used new mathematical methods to explore the theoretical foundations of traditional building techniques. At that time, in order to move the large armies, military roads had to be built that could withstand the weights of the cannons they carried. The quality of such structures was no longer left to chance, but was laid down in guidelines and building regulations.

Today, great efforts are being made to keep this tradition alive and to revive it.

In France, for example, a research project is underway that is subjecting dry-stone retaining walls to structural tests. The aim of this project is to re-establish dry-stone masonry as a "standardisable" construction method.

Begriff Statik

Statik der Baukonstruktionen ist die Lehre von der Sicherheit und Zuverlässigkeit von Tragwerken im Bauwesen. Statik einer Trockensteinmauer bezeichnet deshalb die Beurteilung und Berechnung der Standfestigkeit und Tragfähigkeit einer Trockensteinmauer.

In den allermeisten Fällen soll die Tragfähigkeit und Standsicherheit von Stützmauern beurteilt werden. Andere Gebiete der Statik beinhalten die Beurteilung der Erdbebensicherheit von Mauerwerkskonstruktionen.

Für das Tragverhalten einer Trockensteinmauer spielen drei Faktoren eine Rolle: Das Gewicht des Steinmaterials und die Reibung zwischen den aufeinanderliegenden Steinen sowie die Anordnung und Lage der Steine im Mauerkörper

Literature and Links

Stützmauern in Trockenmauerwerk

Merriman M. A Text-Book on Retaining Walls and Masonry Dams. New York: Wiley; 1892. 

( https://ia800900.us.archive.org/16/items/atextbookonreta01merrgoog/atextbookonreta01merrgoog.pdf )

McCombie PF Morel J-C Garnier D. Drystone Retaining Walls : Design Construction and Assessment. Boca Raton: CRC Press; 2016. doi:10.1201/b19095

Villemus B Boutin C Institut national des sciences appliquées de Lyon (Lyon). Etude Des Murs De Soutènement En Maçonnerie De Pierres Sèches = the Study of Dry-Stone Masonry Retaining Walls. 2004.

( https://www.decouverte-cevennes.fr/wp-content/uploads/2018/03/Thesepierreseche.pdf )

Ciblac T Morel J-C. Sustainable Masonry : Stability and Behavior of Structures. London: ISTE; 2014. http://site.ebrary.com/id/10899799. Accessed November 11 2022.

Mundell, C.; et al. Drystone retaining walls: from full scale testing to construction requirements. Proceedings of the 11th International Conference on Non-conventional Materials and Technologies NOCMAT 2009

Schweizerischer Ingenieur- und Architekten-Verein. Trockenmauerwerk in Naturstein : Bautechnik Erhaltung Und Ökologie. 1. Auflage ed. Zürich: Schweizerischer Ingenieur- und Architektenverein; 2020.

https://de.wikipedia.org/wiki/Schwergewichtswand

Erddruck

https://de.wikipedia.org/wiki/Erddruck

https://en.wikipedia.org/wiki/Lateral_earth_pressure 

Reibung

Wyllie DC. Rock Slope Engineering : Civil Applications. Fifth ed. Boca Raton FL: CRC Press Taylor & Francis Group; 2018.