Geotechnical Stablization

PROBLEM
Residential Building and Retaining Wall Starting to Slide Down the Side of the Mountain.

SOLUTION
Stabilize Earth at the Toe of the Retaining Wall and Anchor Building to the Side of the Mountain.

The original design for the newly applied loads to the side of the mountain required the construction of a retaining wall to provide stabilization of the hillside and support for the building. The vertical and lateral loads applied to the side of the mountain were slowly overcoming the internal shear resistance of the soil.

To stop the movement two steps needed to be accomplished. The toe of the retaining wall needed to be re-compacted and the building needed to be anchored to the hillside with needle piles.

1. The hillside of native soil below the house is very steep.

1. The hillside of native soil below the house is very steep.

The original retaining wall was still performing as designed however an elliptical shear plain appeared to be developing below the composite mass formed by the soil and the retaining wall.

2. The original retaining wall was still performing as designed however an elliptical shear plain appeared to be developing below the composite mass formed by the soil and the retaining wall.

3. The initial soil removal occurred directly in front of the retaining wall which is referred to as the toe of the retaining wall.

3. The initial soil removal occurred directly in front of the retaining wall which is referred to as the toe of the retaining wall.

4. The initial cut was deep enough to intercept the shear plain that was forming below the retaining wall.

4. The initial cut was deep enough to intercept the shear plain that was forming below the retaining wall.

5. The lower section of the toe was removed following the re-compaction of the soil in the initial cut.

5. The lower section of the toe was removed following the re-compaction of the soil in the initial cut.


6. The soil removal required around the building it self was permitted after the toe in front of the retaining wall was approximately 60% complete. The drilling for the needle piles was commenced about the same time.

6. The soil removal required around the building it self was permitted after the toe in front of the retaining wall was approximately 60% complete. The drilling for the needle piles was commenced about the same time.

7. The finish grade of the slope was completed as the work on the building was going on.

7. The finish grade of the slope was completed as the work on the building was going on.


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