202507151208 Status: MiscZettel Tags:
Robocup 2025 Sand Engineering
Practical Engineering - Why Are Beach Holes So Deadly?
Sand Castle Holds Up A Car! - Mechanically Stabilized Earth
Concepts:
Angle Of Repose:
The steepest angle at which a soil can naturally rest. In other words, this is the slope at which the shear stresses within the soil due to its own weight are exactly equal to the shear strength caused by internal friction.
Mechanical Stabilized Earth
Earth
Osha Guidelines:
Slope the hole at 1.5:1 aspect ratio (i.e. 1 meter depth to 1.5 meter horizontal length slope)
This is 33.69° above horizontal
Sand Kit:
- Spade
- Rope
- Thick Copper Wire
- Steel Cable
- Measuring Tape
- Something to pack/compact sand tightly (hands)
- Flashlight
- Pointy thing for details
- Ruler
- “
Knife” - Buckets
- Cube Molds
- (Fishing Line (or any sturdy line) to cut sand
- Cutting Board (A big sheet of something to deposit half finished bricks)
Construction Techniques:
- Apparently water sand is used to make a bunch of baseline structures? Like sand inside a bucket of water.
- To make an arch: Use hands to temporarily hold the sand, then put wet/water sand on top, then remove hands.
- Volcano Technique: Instead of bringing water sand to build the foundation, just use normal sand in a volcano shape, then pour water inside.
- Compact Sand really tightly
- Always carve your sculpture from the top down.