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Sunday, April 26, 2020 | History

2 edition of Pore pressures in debris failure initiation found in the catalog.

Pore pressures in debris failure initiation

Neil Frank Humphrey

Pore pressures in debris failure initiation

  • 131 Want to read
  • 23 Currently reading

Published by State of Washington Water Research Center in Pullman, WA .
Written in English

  • Slopes (Soil mechanics) -- Mathematical models.,
  • Landslides -- Mathematical models.

  • Edition Notes

    Statementby Neil Frank Humphrey ; principal investigator, Thomas Dunne.
    SeriesReport -- 45., Report (State of Washington Water Research Center) -- 45.
    ContributionsDunne, Thomas, 1943-
    The Physical Object
    Paginationix, 169 p. :
    Number of Pages169
    ID Numbers
    Open LibraryOL17768416M

    Wear Debris Analysis] Since the world’s resources of material and energy are getting progressively, by necessity, there is growing involvement in studies of wear on a global basis. Wear of sliding components result in reduced mechanical efficiency and an irretrievable loss of material in the form of wear debris. Aug 01,  · Each of these conditions arguably requires a different view on the processes that cause slope failure and predictive review starts from the perspective of dynamic, adapting earth and ecological systems and discusses how these attributes relate to landslide initiation, mode, location, and timing. Pore water pressures and. Debris on private property does not typically present an immediate health and safety threat to the general public, so removal is normally not eligible for reimbursement. However, the Federal Coordinating Officer (FCO) is authorized to approve the removal of debris from private property when he/she determines that such debris does present an.

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Pore pressures in debris failure initiation by Neil Frank Humphrey Download PDF EPUB FB2

Sep 15,  · The others are of the form of “hydraulic mechanics.” The experiments provide valuable evidence for quantifying clay content impact on gravel soil failure and debris flow initiation.

Because they were carried out in a flume, the research results are applicable to the soil failure and debris flow initiation in bedrock gully by: Pore pressure distribution in the initiation area of a granular debris flow that triggered channel bed failure debris flows in the same area, but threshold 2 is considerable lower than.

The pore pressures along the base increased slowly, with a sharp transient at the fluidization of the deposited material which corresponded to stage II in Section 4 Very significant excess pore pressures were generated during the failure of the deposited material.

Fig. 8b shows detail of the sharp increase in pore pressure. It only lasted about Cited by: Failure during ground-water inflow and during moderate-intensity sprinkling occurred with a rising water table and positive pore pressures. Failure during high-intensity sprinkling occurred without widespread positive pore pressures.

In all three cases, pore pressures in most locations increased dramatically (within seconds) during failure. Centrifuge Model Tests of Rainfall-Induced Landslides. changes in pore water pressures and soil state as well as deformations of the slopes will be measured, while rainfall intensity and total.

May 25,  · Failure initiation does not imply sustained failure; in some cases, enhancement of pore pressures through deviatoric shearing, frictional heating, or runout over compressible saturated alluvium or marine sediments may be necessary following slide Cited by: Aug 30,  · Pore-pressures and factors of safety are computed on diffusivity, and H is the depth of the failure surface in the slope-normal direction.

For areas of the landscape ASSESSING SUSCEPTIBILITY AND TIMING OF SHALLOW LANDSLIDE AND DEBRIS FLOW INITIATION IN THE OREGON COAST RANGE, USA. THE UNIFED THEORY OF DEBRIS FLOW INITIATION BY USING HOMOGENIZATION THEORY yinG-Hsin gave a review for models involving the effect of pore pressures and granular temperature in the mobilization of debris-flow.

In the same paper, they assessed the re-lationship between Coulomb failure and liquefaction, and considered the role of granular. Oct 10,  · Seismic precursor to instability induced by internal erosion in loose granular slopes which were equipped with multiple sensors to evaluate the pore pressures and the internal displacements.

A high-sensitivity seismic accelerometer was installed at the bottom of the flume to record the vibrations produced by the movement of the soil Cited by: 9. INITIATION OF DEBRIS FLOWS. Debris flows in Grand Canyon are initiated by a combination of intense precipitation and subsequent slope failure.

The intensity of rainfall necessary to initiate debris flows in Grand Canyon is poorly known because few climatic stations are in debris-flow producing tributaries. Furthermore, a dynamic slope stability analysis shows that conditions in the debris source area under average pore water pressures and moisture contents are close to failure.

A small excess of water can therefore initiate failure. Seepage analysis is used to estimate the volume of debris that can be released for several hydroclimatic conditions. Sep 30,  · After the initial surge, a new pile rapidly develops in the flat section.

Soon after, however, high pore pressures generate a small failure at the thinning downstream end of the pile. This failure mobilizes into a small surge, while the rear of the pile remains stored in the by: Abstract.

Using a small flume, a series of tests was conducted to trigger rainfall-induced landslides. Based on monitoring of sliding distance and pore pressures, the process of pore-pressure generation in relation to sliding distance was by: 5.

However, our understanding of many aspects of landslide processes is based on hypotheses that are difficult to test.

Elevated pore pressures are essential for landslide initiation on low continental margin slopes, yet understanding of how high pressures are generated or how fluid migration affects slope stability is by: Slope Stability and Stabilization Methods.

by Lee W. Abramson, Thomas S. Lee pore pressures, load, and shear stresses with time for an embankment constructed over a clay deposit. This was consistent with the observed occurrence of large displacements following failure initiation and the attainment of residual strength conditions over.

Previous work on shale mechanical properties has focused on the slow deformation rates appropriate to wellbore deformation. Deformation of shale under a drill bit occurs at a very high rate, and the failure properties of the rock under these conditions are crucial in determining bit performance and.

Read chapter 5 Mass Wasting and Flooding: This book provides an account of the Ecuador earthquakes, evaluating the physical phenomena involved and th.

INITIATION OF DEBRIS FLOWS 19 Figure Schematic diagram illustrating the initiation of debris flows by the failure of bedrock - usually the Hermit Shale and Supai Group - during intense rainfall.

0 5 10 15 20 25 30 35 40 Combinations of Failures Failures in Colluvium Firehose Effect Bedrock Failures Percent of Debris Flows FAILURE TYPE. Furthermore, the ability to flow may also be dependent upon the amount of energy transferred to the falling sediment throughout the failure event.

Often large landslides on the continental margin are complicated and components of slide, debris flow and turbidity current may all be apparent when examining the remains of a submarine landslide.

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, geotechnical engineering and engineering geology.

Slope stability analyses include static and dynamic, analytical or empirical methods to evaluate the stability of earth and rock-fill dams, embankments. Geotechnical Engineering of Dams, 2nd edition provides a comprehensive text on the geotechnical and geological aspects of the investigations for and the design and construction of new dams and the review and assessment of existing dams.

The main emphasis of this work is on embankment dams, but much. transformation from a slide into a debris flow is depicted in three stages: (a)failure localized along a surface within a soil, generally described by the Mohr-Coulomb plastic criterion, (b)partial or complete liquefaction of the bulk as a result of high pore-fluid pressure, (c) initiation and acceleration of.

The analyses are generally aimed at understanding the causes of an occurred slope failure, or the factors that can potentially trigger a slope movement, resulting in a landslide, as well as at preventing the initiation of such movement, slowing it down or arresting it through mitigation countermeasures.

Larger failures may include > km 3 of sediment and extend for hundreds of km from the source area [7,8].The cause of mass failure is not always well understood [].Major debris-flow and mass wasting deposits on the continental slope are known throughout the Cenozoic [4,6].It is therefore difficult to propose that their origin is always closely linked to any one causative Kevin MacKillop, Gordon Fenton, David Mosher, Valerie Latour, Perry Mitchelmore.

Quantification of the risk of failure, either progressive or catastrophic, open hole or cased, during drilling or production, requires the calculation of stress and/or deformation fields around the wellbore and a comparison with accepted criteria of failure.

A high-resolution CPT trace at Bramley Drive indicates induced pore water pressures rising steadily to a peak at approximately 25 m depth; this depth coincides with the base of the landslide scarp.

We infer that elevated pore water pressures develop within this single, thick aquifer, triggering failure through reduced effective by: 4. Slope failure is a complex process which depends on several factors concerning nature and properties of soil, slope morphology and structure, past stress history, groundwater regime, boundary conditions, and their changes.

As a consequence, the mechanism of slope failure is typically characterized by the development of a highly non-uniform strain field, which does not allow an easy prediction Cited by: 1.

The key feature of the code is the capability of evaluating the time t p required to reach the peak pore pressure head on the failure surface and computing the corresponding critical intensity/duration thresholds based on post-event peak pore pressures.

@article{osti_, title = {Modeling Dynamic Fracture of Cryogenic Pellets}, author = {Parks, Paul}, abstractNote = {This work is part of an investigation with the long-range objective of predicting the size distribution function and velocity dispersion of shattered pellet fragments after a large cryogenic pellet impacts a solid surface at high by: 1.

Hybrid submarine flows comprising turbidity current and cohesive debris flow: Deposits, theoretical and experimental analyses, and generalized models Dissipation of excess pore pressures after the debris flow has stopped can lead to foundering of overlying layers, and in situ soft sediment deformation.

Cited by: With sufficient infiltration, pore‐water pressures along the landslide's shear boundaries increase and reduce frictional resistance (equation 1). If these pressures rise sufficiently high, as they may have during the winter and spring of (Figure 1), declining overall resistance to landsliding results in landslide acceleration.

If pore Cited by: 9. ISa Introduction to Debris Operations Lesson 1: Introduction and Course Overview Course Welcome. Welcome to the Introduction to Debris Operations online course. This course explains general debris removal operations and addresses critical debris removal issues.

Course Goal and Content. Marine debris is a pervasive problem along shorelines and in coastal waters, estuaries, and oceans throughout the world. For purposes of the Marine Debris Research, Prevention, and Reduction Act (MDRPRA) only, marine debris is defined as any persistent solid material that is.

pore pressures in mudstones adjacent to salt bodies, American Rock Mechanics Association, This paper was prepared for presentation at the 45th US Rock Mechanics / Geomechanics Symposium held in San Francisco, CA, June 26– +Nikolinakou, M., +Luo, G., Hudec, M., Flemings, P.B.,Modeling advancing salt sheets – with analogies.

Periglacial debris-flow initiation and susceptibility and glacier recession from imagery, airborne LiDAR, and ground-based mapping Models based on steady-state hydrology and the effects of pore pressures on slope stability provide maps of relative susceptibility to shallow rapid Debris-flow initiation sites associated with small Cited by: 9.

Outburst debris-flows from failure of natural dams 29 R.L. Schuster Debris-flow initiation processes Debris-flow response of southern California watersheds burned by wildfire 45 Mechanisms of rainfall-induced landslides in Hong Kong 53, & Study on debris-flow triggered by pore water pressure 61 & Geotechnical Slope Analysis - CRC Press Book.

Freshly updated and extended version of Slope Analysis (Chowdhury, Elsevier, ). This reference book gives a complete overview of the developments in slope engineering in the last 30 years.

Its multi-disciplinary, critical approach and the chapters devoted to seismic effects and probabilistic app. Study on Seepage-Induced Debris Flows Initiation under the Rainfall Action for Loose Soil An indoor artificial rainfall model tank test has been designed; it can be used to simulate the process of debris flow initiation for slope loose soil under the rainfall action.

The debris flow starting condition and confluence process have been. You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read.

Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. A debris flow is a moving mass of loose mud, sand, soil, rock, water and air that travels down a slope under the influence of gravity.

To be considered a debris flow the moving material must be loose and capable of "flow", and at least 50% of the material must be. Fire debris analysis can be broken into four primary and sequential steps: sample collection, extraction or sample preparation, sample analysis, and data interpretation.

Ignitable liquids are broadly divided into to two major classes: petroleum-based and Reta Newman.May 03,  · Comprehensive account, treating both theoretical and applied aspects of debris flow.

The text begins with a discussion of fundamental mechanical aspects, such as flow characteristics, type classification, mechanics, occurrence and development, fully-developed flow and deposition processes.

The second part of the book sheds light on the application of theory in relation to computer-simulated Reviews: 1.Initiation zones of debris flows and glacial disasters: research experience of Moscow University _____ Regional Climate Risk Resilience Workshop on “Fostering Resilience to Remote Geo-Hazards” Dushanbe, Tajikistan, 2 June howtogetridofbadbreath.clubsov Moscow State University, Faculty of Geography, University Centre for Engineering.