2 edition of Slope failures in Oregon found in the catalog.
Slope failures in Oregon
R. Jon Hofmeister
The objective of this project was to collect and consolidate data on Oregon landslides associated with severe storm events in February 1996, November 1996, and December 1996/January 1997. This study builds upon previous work in the Portland Metro area by Scott Burns and others at Portland State University, as well as on a number of other landslide studies throughout the state. The February storm event led to a Federal disaster declaration for 27 counties, the November event for 3, and the December/January storms for 14. Over 98 percent of the landslides were recorded in the western portion of the state, mainly in the Coast Range and the Cascade Range, with fewer in the Willamette Valley and the Klamath Mountains. Counties with the highest percentage of total landslides reported are Lane (24 %), Douglas (11 %), Linn (10 %), Clackamas (9 %), Tillamook (9 %), Lincoln (8 %), and Multnomah (7 %). The products of this study are (1) a digital Geographic Information System (GIS) inventory of Oregon landslide locations, (2) a spreadsheet version of the inventory for those not using GIS, and (3) this explanatory text. The inventory database includes 9,582 slide location entries, with varying amounts of information reported for each individual entry. The database entries contain several items describing the geographic location of each landslide and up to 15 additional items relating to failure mechanism, size, geometry, associated damage, etc., depending upon the information obtained from the contributing sources. The digital outputs are intended to provide a starting point for future landslide-related studies.
|Statement||by R. Jon Hofmeister.|
|Series||Special paper / Oregon Dept. of Geology and Mineral Industries -- 34., Special paper (Oregon. Dept. of Geology and Mineral Industries) -- 34.|
|The Physical Object|
|Pagination||iii, 20 p. :|
|Number of Pages||20|
Slope Failure A slope failure is a phenomenon that a slope collapses abruptly due to weakened self-retainability of the earth under the influence of a rainfall or an earthquake. Because of sudden collapse of slope, many people fail to escape from it if it occurs near a . [Niigata City]: [National Conference of Landslide and Slope Failure Control], [?] Edition/Format: Print book: Conference publication: Japanese: Rating: (not yet rated) 0 with reviews - Be the first. Subjects: Landslides -- Japan. Slopes (Soil mechanics) -- Japan. Landslides. View all subjects; More like this: Similar Items.
This hidden threat is a particular concern in the siting, design, construction, and failure analysis of dams. How We Can Help. Exponent geologists and engineers use many tools to investigate pertinent aspects of landslides, slope failures, and erosion. Asphalt Pavement Association of Oregon Gaffin Road, SE Salem, OR by R.G. Hicks Department of Civil Engineering Oregon State University Corvallis, OR Paul Curren Pavement Engineering Inc. Petaluma, CA and James R. Lundy Department of Civil Engineering Oregon State University Corvallis, OR Decem
This failure plane extends down through the waste until it hits the bottom, travels along the bottom and up the side slopes of the landfill floor, until it exits ant the toe of an adjacent slope. Rotational failure also extends down through the waste from the top of the slope, but instead it follows a curved path that takes it out near the toe. Slope failure has become a major concern in Malaysia due to the rapid development and urbanisation in the country. It poses severe threats to any highway construction industry, residential areas, natural resources, as well as tourism activities. Thus, this study aims to characterise the relationship between chromaticity variables to be manipulated as indicators to forecast slope failure.
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Slope failures in Oregon: GIS inventory for three /97 storm events (Special paper / Oregon Dept. of Geology and Mineral Industries) [R. Jon Hofmeister] on *FREE* shipping on. The reference citation is: Hofmeister, R. J.,Slope Failures in Oregon: GIS Inventory for Three /97 Storm Events: Oregon Department of Geology and Mineral Industries Special Pa 20.
Slope failures depend on the soil type, soil stratification, groundwater, seepage, and the slope geometry. We will introduce a few types of slope failure that are common in soils.
Translational Slide. Failure of a slope along a weak zone of soil is called a translational slide (Figure a). The sliding mass can travel long distances before. Get this from a library. Slope failures in Oregon: GIS inventory for three /97 storm events.
[R Jon Hofmeister; Oregon. Department of Geology and Mineral Industries.]. Oregon has the steepest local slopes, but surprisingly few large failures for a seismically active margin (especially in the north), implying that slope angle and seismic activity may not be the most important slope stability controls.
The California continental slope is heavily incised, which makes failure Cited by: Failure Modes Introduction. Slope failures are essentially natural hazards that occur in many areas over the world.
Popularly known as landslides, slope failures describe a wide variety of mechanisms that cause the outward or downward movement of slope-forming materials like rock, soil or ide can result either from rock failure or soil failure.
An earth Slope or soil slope is an inclined surface of soil mass which can be either natural or man-made. Different types of slope failures and shape of their failure surfaces are discussed below.
Types of Slope Failures Soil slope failures are generally of four types: Translational Failure Rotational Failure Wedge Failure Compound Failure [ ]. Recent Slope Failures, Ancient Landslides, and Related Geology of the North-central Coastal Area, San Diego County, California: Including Most of the Cities of Oceanside and Vista, the North Parts of the Cities of Carlsbad and San Marcos, and Unincorporated Parts of the County of San Diego Vol Issue 12 of DMG open-file report: Author.
FHWA NHI 6 – Slope Stability Soils and Foundations – Volume I 6 - 2 December Figure Embankment failures: (a) Infinite slope failure in embankment fill, (b) Circular arc failure in embankment fill and foundation soil, (c) Sliding block failure in embankment fill and foundation soil, and (d) Lateral squeeze of foundation soil.
Socioeconomic consequences of slope failures 3 Principles of rock slope engineering 4 Civil engineering 4 Open pit mining slope stability 5 Slope features and dimensions 8 Rock slope design methods 8 Summary of design methods 8 Limit equilibrium analysis (deterministic) 11 Sensitivity analysis For one thing, the USMS developers elected to focus more heavily on categories related to the cost of a slope failure (e.g., the cost of repair and cleanup as well as the cost of property damage and personal injury) than factors related to slope failure potential Also, in part because of the additional failure modes 35 RHRS Manual, supra.
written permission of GEO-SLOPE International, Ltd. Trademarks: GEO-SLOPE, GeoStudio, SLOPE/W, SEEP/W, SIGMA/W, QUAKE/W, CTRAN/W, TEMP/W, AIR/W and VADOSE/W are trademarks or.
Rotte Veerabhadra M. Gajjar Hardik V. "Influence of Reinforcement Pattern on the Performance of Geotextile-Reinforced Slopes. " Advances in Computer Methods and Geomechanics /, Singh Jayraj Banka Haider Verma A.
"Locating critical failure surface using meta-heuristic approaches: a comparative assessment. " Arabian Journal of. There is only one failure (that meets our selection criteria) larger than km 2 on the Oregon slope. This failure, north of the Heceta South Fault ( km 2; Fig. 14), is one of only two over km 2 with blocky rubble at the base in all of the study areas (the other is a km 2 failure on.
The hillslope failures we detected had a mean area of cm 2 and a standard deviation of cm 2. The smallest recorded failure had an area of cm 2; the largest had an area of 62 cm 2. Smaller events were more numerous than large ones. In Oregon, since doctor-assisted-suicide was legalized, over 96 percent of people given lethal drugs did not undergo a psychiatric evaluation.
To not evaluate is neglect, but if this Dutch bill becomes law, any elderly person who admits suicidal wishes will be referred to those who will. Importance of slope stability problem is the reason why so many alternate methods have been developed for evaluating the safety of a slope.
The basic approach is determining a factor of safety. calculated for a western Oregon forest soil from previously published data and soil water potentials a sliding failure was expected at a slope of percent. Hungary e-book p. On the other hand, erosion in the form of undercutting at the toe may increase the height of the slope, or decrease the length of the incipient failure surface, thus decreasing the stability.
Slope Angle and Rainfall. Rainfall has been identified as one of the main causes for slope failures in areas where high annual rainfall is experienced. Rainfall Induced Soil Slope Failure: Stability Analysis and Probabilistic Assessment integrates probabilistic approaches with the geotechnical modeling of slope failures under rainfall conditions with unsaturated soil.
It covers theoretical models of rainfall infiltration and stability analysis, reliability analysis based on coupled hydro. Special Pa Slope failures in Oregon: GIS inventory for three /97 storm events, by R.
Jon Hofmeister,20 p. report, GIS files, spreadsheet. Download publication (8 file) Distribution of the 9, database entries throughout the state.
Abstract.of slope stability involve the assumption of a circular failure arc. Most of the techniques discussed in this chapter are based upon this assumption.
For composite failure surfaces, analyses have been developed by Morgenstern and Price () and by Janbu (). The problem is illustrated in .A landslide occurs, initiated by a global slope stability failure (rotational) in sedimentary deposit rock formation material near the top of the mountain.
The debris landslide occurred after notable rainfall and traveled approximately miles, killing 3 men and leaving new deposits up to feet thick in a matter of minutes (not millions of.