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A case history study on causation of the landslide in Santa Clara,California, USA

Journal of Rock Mechanics and Geotechnical Engineering 2015年第2期7卷 185-192页

作者： Yun Liao Sadek M. Derrega Craig A. Hall Kleinfelder 1330 Broadway Suite 1200 Oakland CA 94612 USA Kleinfelder 4670 Willow Road Suite 100 Pleasanton CA 94588 USA

This paper presents a case history study on the geologic investigation and numerical modeling of areactivated landslide in the County of Santa Clara, California to identify the failure mechanism. Thelandslide occurred on an approximately 18.3-m high, north-facing slope during March 2011. The landslidemeasured about 33.5 m in width and about 51.8 m in length. Along the toe of the slope, a residentialstructure with a swimming pool was built on a cut and fill pad and there are several other structurespresent along the western side of the pad. The landslide occurred immediately to the south of theresidential building and moved northward between the County Road A and the house＇s side yard. Themovement of the landslide resulted in damaging the west-bound traffic lane of County Road A andencroached onto the paved driveway for the residential property. An investigation was performed toidentify the failure mechanism of the landslide to conclude whether Road A re-alignment by the Countyor prominent cutting performed along the lower portion of the slope by the homeowner during 2000through 2004 contributed to the reactivation of the old landslide deposit. The investigation included sitereconnaissance, reviewing available published geologic information, reviewing site-specific geologic andgeotechnical data developed by other consultants, and performing numerical modeling. The outcomes ofthe investigation indicate that the primary causation for the reactivation and failure of the subject preexistinglandslide is the prominent cutting performed along the lower portion of the slope during 2000through 2004 and water tank cut bench. The Road A re-alignment did not contribute to the reactivationof the old landslide deposit. 2015 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting byElsevier B.V. All rights reserved.

关键词： pre-existing landslide ailure mechanism Slope stability

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