X
xuxuzinho3 Oct 2017 21:00Hello experts,
I am planning to build a terrace behind my single-family home. The terrain slopes slightly (about 2% incline), and the earthworks contractor has created a flat area behind the house, roughly trapezoidal in shape, about 2m (6.5 ft) high, approximately 10m (33 ft) wide, and around 8m (26 ft) deep.
This was done about two months ago, so the sand has not yet fully settled, even though I have thoroughly compacted it with a vibratory plate. I want to build a terrace measuring 6 by 6 meters (20 by 20 ft) and thought a concrete slab would be the best solution.
The risk I see is with the sand, which comes partly from the basement excavation and partly from the natural ground: it contains clay components as well as small to medium-sized stones. It’s hard to estimate exactly, but I would say it consists of about 80% normal medium-grain sand, 10% clay, and 10% quarry stone and pebbles.
Even though I have planned a safety distance of at least 2m (6.5 ft) from the edge of the concrete slab to the edge of the filled sand, I am not sure if the clay content might cause problems in terms of the weight of a 15cm (6 inch) thick concrete slab measuring 6 by 6 meters (20 by 20 ft).
Are there any known experiences, methods, or anything else that could help estimate whether this might fail and the slab could slide down the slope after a year because the sand beneath “flows” under the weight?
Thanks in advance!
Regards
I am planning to build a terrace behind my single-family home. The terrain slopes slightly (about 2% incline), and the earthworks contractor has created a flat area behind the house, roughly trapezoidal in shape, about 2m (6.5 ft) high, approximately 10m (33 ft) wide, and around 8m (26 ft) deep.
This was done about two months ago, so the sand has not yet fully settled, even though I have thoroughly compacted it with a vibratory plate. I want to build a terrace measuring 6 by 6 meters (20 by 20 ft) and thought a concrete slab would be the best solution.
The risk I see is with the sand, which comes partly from the basement excavation and partly from the natural ground: it contains clay components as well as small to medium-sized stones. It’s hard to estimate exactly, but I would say it consists of about 80% normal medium-grain sand, 10% clay, and 10% quarry stone and pebbles.
Even though I have planned a safety distance of at least 2m (6.5 ft) from the edge of the concrete slab to the edge of the filled sand, I am not sure if the clay content might cause problems in terms of the weight of a 15cm (6 inch) thick concrete slab measuring 6 by 6 meters (20 by 20 ft).
Are there any known experiences, methods, or anything else that could help estimate whether this might fail and the slab could slide down the slope after a year because the sand beneath “flows” under the weight?
Thanks in advance!
Regards
Similar topics