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 is a geohazard that impacts many types of infrastructure, from individual homes to municipal storm sewer networks to oil and gas pipelines. In fact, the Pipeline and Hazardous Materials Safety Administration requires that natural gas and hazardous liquids pipelines develop risk assessment programs for slope failures in their systems. Landslides, or slope failure, occur whether people are there or not! But, human land-use does have a major impact on slope processes. The combination of uncontrollable natural conditions (earthquakes, heavy rainstorms, etc.) and artificially altered landforms can result in disastrous slope failures, and does. The Unstable Slopes Program analyzes slopes adjacent to state highways for potential impacts that a failure could cause. Such failures include: Landslides; Rock falls; and Debris fills. Historically, ODOT has evaluated rock fall hazards, but has expanded the program to include other types of. Yesterday I flew a Zagi off the hang glider launch site ("Anderson's Viewpoint") by the highway on the north side of Cape Lookout-- the wind flags at launch were pretty limp but that's just because the wind was too north to really come in well to the launch area -- (NW is ideal)-- but the wind (roughly NNW) still had enough of a W component to make terrific lift once the glider got out into.
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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.
Abstract. Proceedings of the Geo-Congress, held in San Diego, California, MarchSponsored by the Geo-Institute of ASCE. This Geotechnical Special Publication contains peer-reviewed technical papers and case studies focusing on the stability, performance, and rehabilitation of slopes, embankments, and dams.
Oregon Unstable Slopes Program With FHWA assistance, the Oregon DOT developed the original Rockfall Hazard Rating System (RHRS) which has been adopted by a number of states. The Oregon DOT has expanded its unstable slope management program to include soil slope.
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. The book introduces both natural and man-made slopes, the nature of soils and rocks, geomorphology, geology, and the aims of slope analysis.
These topics are followed by chapters about stress and strain, shear strength of rock and soils, and progressive failure of slopes. Oregon Coast Economic Summit, Aug Grand Ronde. The Really Big One: A Public Forum On Earthquake Hazards. and Preparedness in the PNW, University of Oregon, Eugene, August 6, 7 PM.
Straub Hall. New Books New Novel: Stick Slip from Chris Scholz. An entertaining read about a Cascadia great earthquake. October update: E-book now available click here. The Large Open Pit Mine Slope Stability Project addresses an industry wide need for improved knowledge of the mechanisms of rock slope failure.
The project focuses on the relationships between rock mass strength and deformability. Slope stability analysis is a static or dynamic, analytical or empirical method to evaluate the stability of earth and rock-fill dams, embankments, excavated slopes, and natural slopes in soil and rock.
Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo stability condition of slopes is a subject of study and research in soil mechanics. Rock Failure Mechanisms book. Illustrated and Explained. Rock Failure Mechanisms.
DOI link for Rock Failure Mechanisms. Rock Failure Mechanisms book. Illustrated and Explained. By Chun'An Tang, John A.
Hudson. Edition 1st Edition. First Published Slope failure in rock masses. Home | US Forest Service. Rock slope failures in Norwegian fjord areas: Examples, spatial distribution and temporal patterns. In Landslides from Massive Rock Slope Failure.
Proceedings of the NATO Advanced Research Workshop on Massive Rock Slope Failure: New Models for Hazard Assessment, Celano, Italy, 16–21 Juneed.
S.G. Evans, G. Scarascia Mugnozza, A. Figure Vc. Slope and Shield Configurations. Text version of Figure Vc. This figure illustrates how a support or shield system can be used in Type C soil. The slope alongside it is 18" minimum, 20' maximum, with a 1/ slope.
Slope Soaring in Oregon in Early February. I will be in Portland from Feb 4 to Feb 8, with a chance to go slope soaring on the 6th and 7th. I live in Texas, so i think of February as crisp, nice weather.
But I realize that this may not be true for Oregon. Dayle Lee is listed as a President with North Slope Construction Company in Oregon.
The address on file for this person is Duane Ave, Oregon City, OR in Clackamas County. The company is a Oregon Domestic Business Corporation, which was filed on January 6, Heavy rains are typically related to storms.
Changes in water flow patterns can be caused by earthquakes, previous slope failures that dam up streams, or human structures that interfere with runoff (e.g., buildings, roads, or parking lots).
An example of this is the deadly debris flow in North Vancouver (Figure ).The book also includes a new case study about Hurricane Katrina failures at 17 th Street and London Avenue Canal, plus additional case studies that frame the principles and techniques described.
Slope stability is a critical element of geotechnical engineering, involved in virtually every civil engineering project, especially highway development.