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Understanding Frost Heave Principles

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Retaining walls and Geogrid- How a retaining wall fails pt2

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What happens here

The video begins with the presenter introducing the concept of retaining walls and the critical issue of frost heave, which is the upward swelling of soil during freezing conditions caused by water turning into ice and expanding. He sets the stage for understanding why proper drainage is paramount for the longevity and stability of any retaining wall. He then performs a simple demonstration using sand and heavy metal weight plates in cardboard boxes. He explains that wet sand, when agitated, behaves like water expanding when it freezes, highlighting the immense pressure that frost heave can exert on a structure. He emphasizes that frost heave can lift extremely heavy objects, illustrating the destructive force of this natural phenomenon.

Goal: Grasp the fundamental physics behind frost heave and its relevance to retaining walls.

Tools and materials

  • Cardboard Boxes — Containers for the sand and weights in the demonstration
  • Sand — Demonstrating the expansion of frozen soil
  • Weight Plates — Representing the load lifted by frost heave

What they say

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how are you guys today we're covering geogrid what it is and why it is fundamentally the most important element in any retaining wall construction once the wall reaches four feet has a sore has a slope behind it or has a surcharge or the load from a building behind it now if you're just tuning in make sure you go back to the first video because in that video we actually do a hands-on demonstration showing how effective geogrid is at retaining soil and holding it together in comparison to a retaining wall built without it so check that one out and today what we're doing is we're taking the lessons that we learned in the first video and actually going out on to real job sites and analyzing retaining walls using the knowledge we gained in the other video to look at these walls and to make yourself ask a question are these walls built the right way and once you start to understand the fundamental principles of geogrid you start to see things behind the scenes that otherwise would just look perfectly fine so we're going out to some sites today and checking out some retaining walls that just make you go hmm all right so now

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