Project: Statics of drystone walls

Statics / Gravity

Weight of stones

Each rock has a certain weight (bulk density, specific gravity), which is usually expressed in tonnes per cubic metre (to/m3).

Weight of different rocks:

  • Granite: 2.6 to/m3 bis 3.0 to/m3
  • Marmor: 2.7 to/m3 bis 2.9 to/m3
  • Basalt: 2.9 to/m3 bis 3.2 to/m3
  • Gneis: 2.5 to/m3 bis 2.95 to/m3
  • Sandstein 2.0 to/m3 bis 2.8 to/m3
  • Tuff 1.5 to/m3 bis 2.8 to/m3
  • Kalkstein 1.5 to/m3 bis 2.75 to/m3
  • Quarzit 2.6 to/m3

Void ratio

When building a dry stone wall, individual stones are piled up to form a wall body. The hollow spaces of the joints remain between the individual stones. Depending on the shape of the bricks and the care of the mason, more or less voids remain.

According to Mundell (2009), the void ratio is 20% - 45% of the full volume, depending on the quality of the construction. This void ratio must be deducted when calculating the weight of a masonry unit made of dry masonry.

Statics / Gravity

Weight of stones

Each rock has a certain weight (bulk density, specific gravity), which is usually expressed in tonnes per cubic metre (to/m3).

Weight of different rocks:

  • Granite: 2.6 to/m3 bis 3.0 to/m3
  • Marmor: 2.7 to/m3 bis 2.9 to/m3
  • Basalt: 2.9 to/m3 bis 3.2 to/m3
  • Gneis: 2.5 to/m3 bis 2.95 to/m3
  • Sandstein 2.0 to/m3 bis 2.8 to/m3
  • Tuff 1.5 to/m3 bis 2.8 to/m3
  • Kalkstein 1.5 to/m3 bis 2.75 to/m3
  • Quarzit 2.6 to/m3

Void ratio

When building a dry stone wall, individual stones are piled up to form a wall body. The hollow spaces of the joints remain between the individual stones. Depending on the shape of the bricks and the care of the mason, more or less voids remain.

According to Mundell (2009), the void ratio is 20% - 45% of the full volume, depending on the quality of the construction. This void ratio must be deducted when calculating the weight of a masonry unit made of dry masonry.