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La Ventana landslide, cities of San Clemente and Dana Point, California

By
William Goodman
William Goodman
NMG Geotechnical, Inc., 17791 Mitchell, Suite D, Irvine, California 92714
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Jules Darras
Jules Darras
Zeiser Kling Consultants, Inc., 3187 Redhill Avenue, Suite 135, Costa Mesa, California 92626
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Published:
January 01, 1997

Abstract

A block-glide debris-fall landslide occurred on February 22,1993, within a 30.5-m (lOO-ft)-high bluff in the Capistrano Beach area in the cities of Dana Point and San Clemente, Orange County, California. Five homes were destroyed, and several others remained in jeopardy subsequent to this catastrophic ground failure. The landslide caused the bluff top to retreat a maximum of 24.4 m (80 ft) and deposited 20,000 m3 (27,000 cy3) of landslide debris up to 10.5 m (35 ft) deep on Pacific Coast Highway (PCH), a designated emergency evacuation route for the San Onofre nuclear-powered electricity generating station. The landslide debris also covered a 76.2-m (250-ft) sec-tion of the only rail line linking the Los Angeles/Orange County area with San Diego.

The winter storms preceding this landslide brought 53.3 cm (21 in) of rain to the Capistrano Beach area. The single-month peak of 29 cm (11.44 in) occurred in January and was the highest in 30 yr. This excessive rainfall infiltrated the subsurface, trig-gering the landslide, which failed on an adverse-dipping clay bed at approximately midslope of the 30.5-m (lOO-ft)-high bluffs. The landslide scarp was controlled by high-angle bedrock jointing.

Mitigation alternatives were restrictive because of the many public/private landowners involved and the fact that the city boundary between Dana Point and San Clemente is located in the upper part of the bluff. Initially, the various stabilization options considered to reopen PCH were restricted within the jurisdiction of Dana Point. Eventually, the failed portion of the bluff was restored by a system of rock-bolt tiebacks combined with a hardface wall and buttressed slope. Subdrainage was installed along the buttress backcut and behind the hardface wall, and outlets were provided at the slope face.

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Contents

GSA Reviews in Engineering Geology

Storm-Induced Geologic Hazards

Robert A. Larson
Robert A. Larson
Los Angeles County Department of Public Works 900 South Fremont Avenue Alhambra, California 91803
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James E. Slosson
James E. Slosson
Slosson and Associates 15500 Erwin Street, Suite 1123 Van Nuys, California 91411
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Geological Society of America
Volume
11
ISBN electronic:
9780813758114
Publication date:
January 01, 1997

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