In the spring of 2013, the City of Los Angeles installed twenty 600-foot dewatering drains using horizontal directional drilling (HDD) in the eastern flank of White Point Landslide. The dewatering system served to stabilize exposed sections of coastal bluff between the landslide and the nearby residences of San Pedro, California. This project marked the first known use of HDD as a means of slope stabilization using dewatering construction. The following summarizes innovations required to adapt HDD to coastal landslide conditions. These field-tested innovations included beachfront containment of drilling fluid, landslide behavior monitoring during drilling, and drill location control on the slope face using microcoil wireline field surveys. The authors believe that lessons learned at White Point can be applied to numerous cases of slope instability found on the California coastline, giving HDD a future in landslide remediation.
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