Assess Existing Wall and Plan Reconstruction
At 0:26 in
Building a Failed Boulder Wall
What happens here
Begin by assessing the existing boulder retaining wall to identify failure points. Observe that the current wall uses boulders that are too small, are not properly embedded ('no toe-in'), and are stacked incorrectly, leading to instability. Note any signs of soil erosion or bulging. The presence of a sprinkler system directly watering the wall is also identified as a contributing factor to its failure. This step involves visually inspecting the wall and discussing the engineering principles of a stable retaining wall, such as needing large boulders that are buried deep into the bank to withstand pressure from behind. The video highlights specific instances where rocks are angled incorrectly or are merely stacked, causing them to push out as the dirt settles.
Goal: Understand the causes of wall failure and plan for proper reconstruction.
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