The strength of soil is proportional to the pressure between the soil grains. Negative pressure (vacuum) pulls the soil grains together and increases strength. Similarly, positive water pressure pushs the grains apart and reduces strength. These concepts are illustrated by 3 simple demos.
1) Sliding Knuckles - How does the pressure on your knuckles change the resistance to sliding?
2) Iron Glove - How does a vacuum change the strength of sand in a rubber glove?
3) Liquefaction Tank - Vibrations cause positive water pressure in a tank of sand, loss of strength, and extreme settlement. Kids can make buildings from blocks and then watch them sink.
Hosted by- Geotechnical Student Organization (GSO)
The Geotechnical Student Organization (GSO) is a student-led body that functions to enhance the educational and personal experience of students in geotechnical engineering at Virginia Tech. The organization is committed to increasing student awareness of the geotechnical engineering profession as well as Virginia Tech’s reputation as a leader.
The GSO at Virginia Tech was founded in 2009 by the graduate students to enhance the student experience, promote the field of geotechncial engineering to undergraduates and the community at large, and connect with our national professional organization, the Geo-Institute of the American Society of Civil Engineers (ASCE). The GSO receives generous support from the Center of Geotechnical Practice and Research (CGPR).
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