检索结果-南通市图书馆

Development of a GIS-based failure investigation system for highway soil slopes

Frontiers of Earth Science 2015年第2期9卷 165-178页

作者： Raghav RAMANATHAN Ahmet H. AYDILEK Burak F. TANYU Paul C. Rizzo Associates Inc. 500 Penn Center Blvd. Pittsburgh PA 15235 USA Department of Civil and Environmental Engineering University of Maryland MD 20742 USA Department of Civil Environmental and Infrastructure Engineenng George Mason University Fairfax VA 22030 USA

A framework for preparation of an early warning system was developed for Maryland, using a GIS database and a collective overlay of maps that highlight highway slopes susceptible to soil slides or slope failures in advance through spatial and statistical analysis. Data for existing soil slope failures was collected from geotechnical reports and field visits. A total of 48 slope failures were recorded and analyzed. Six factors, including event precipitation, geological formation, land cover, slope history, slope angle, and elevation were considered to affect highway soil siope stability. The observed trends indicate that precipitation and poor surface or subsurface drainage conditions are principal factors causing slope failures. 96% of the failed slopes have an open drainage section. A majority of the failed slopes lie in regions with relatively high event precipitation （P 〉 200 mm）. 90% of the existing failures are surficial erosion type failures, and only 1 out of the 42 slope failures is deep rotational type failure. More than half of the analyzed slope failures have occurred in regions having low density land cover. 46% of failures are on slopes with slope angles between 20~ and 30~. Influx of more data relating to failed slopes should give rise to more trends, and thus the developed slope management system will aid the state highway engineers in prudential budget allocation and prioritizing different remediation projects based on the literature reviewed on the principles, concepts, techniques, and methodology for slope instability evaluation （Lesh- chinsky et al., 2015）.

关键词： soil slope slope management system geo-graphic information system hazard mapping

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