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Sunday, July 12, 2020 | History

3 edition of Borehole stability in densely welded tuffs found in the catalog.

Borehole stability in densely welded tuffs

K. Fuenkajorn

Borehole stability in densely welded tuffs

by K. Fuenkajorn

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  • 28 Currently reading

Published by Division of Regulatory Applications, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, Supt. of Docs., U.S. G.P.O. [distributor] in Washington, DC .
Written in English

    Subjects:
  • Volcanic ash, tuff, etc. -- Weldability.,
  • Radioactive waste disposal in the ground.

  • Edition Notes

    Statementprepared by K. Fuenkajorn, J.J.K. Daemen.
    ContributionsDaemen, J. J. K., U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Regulatory Applications., University of Arizona. Dept. of Mining and Geological Engineering.
    The Physical Object
    FormatMicroform
    Paginationxi, 58 p.
    Number of Pages58
    ID Numbers
    Open LibraryOL14695964M

    bulk density of the rock. Non-welded units have low rock densities, densely welded units have high rock densities, while highly altered units have low rock densities (see Table 1). The unstable borehole wall conditions yield measured bulk density iralues for the tuffs in the upper portion of UE25a The Bishop Tuff is a welded tuff that was created , years ago during (Hildreth, ). A layer of the Bishop Tuff was encountered in a well drilled on Paoha Island, Mono Lake, at a depth of m (Hill, ). The lower, central part of the tuff has the maximum density for it is where heat is retained the longest. The top and.

    bulk density of the rock. Non-welded units have low rock densities, densely welded units have high rock densities, while highly altered units have low rock densities (see Table 1). The unstable borehole wall conditions yield measured bulk density values for the tuffs in the upper portion of UE25a @article{osti_, title = {Borehole and geohydrologic data for test hole USW UZ-6, Yucca Mountain area, Nye County, Nevada}, author = {Whitfield, Jr, M S and Loskot, C L and Cope, C M}, abstractNote = {Test hole USW UZ-6, located kilometers west of the Nevada Test Site on a major north-trending ridge at Yucca Mountain, was dry drilled in Tertiary tuff to a depth of meters.

    Borehole Breakouts. The breakout phenomena was also observed in the non-welded Paint Brush tuff along the spring line of the Exploratory Studies Facility approximately m below the Yucca Crest, Nevada. The cracks are densely spaced and subparallel both to the borehole wall and the maximum horizontal stress direction. Progressive. A field study for understanding thermally driven coupled processes in partially saturated fractured welded tuff. The densely fractured welded-tuff formation at Yucca Mountain, Nevada, is the proposed site for a national high-level nuclear waste repository. The issue of the stability of boreholes for potential in-floor borehole Cited by: 7.


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Borehole stability in densely welded tuffs by K. Fuenkajorn Download PDF EPUB FB2

Title: Borehole stability in densely welded tuffs The stability of boreholes, or more generally of underground openings (i.e. including shafts, ramps, drifts, tunnels, etc.) at locations where seals or plugs are to be placed is an important consideration in seal design for a.

Triaxial and biaxial borehole stability tests have been performed on densely welded Apache Leap tuff samples and Topopah Spring tuff samples. The nominal diameter of the test hole is or mm for triaxial testing, and mm for biaxial testing. The borehole axis is parallel to one of the principal stress by: 1.

Triaxial and biaxial borehole stability tests have been performed on densely welded Apache Leap tuff samples and Topopah Spring tuff samples. The nominal diameter of the test hole is or mm for triaxial testing, and mm for biaxial testing.

The borehole axis is Cited by: 1. Get this from a library. Borehole stability in densely welded tuffs. [K Fuenkajorn; J J K Daemen; U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Regulatory Applications.; University of Arizona.

Department of Mining and Geological Engineering.]. Figure Schematic representation showing the distribution of columnar jointing in a welded tuff. Most closely spaced in the densely welded zone, a few of the joints are continuous into the partially welded zones above and below, but generally do not extend downward into the nonwelded zone.

Lateral zonation is well developed. The tuffs are most densely welded where the thickness is the greatest. Zone boundaries are parallel to isopachs for the uncompacted thickness. In the zone of dense welding of the Askja tuff, the tuff is welded from bottom to top, although no significant overburden has been removed since The definition of tuff given by the American Geological Institute is: “A rock formed of compacted volcanic fragments, generally smaller than 4 mm in diameter.” However, in practice and in the context of this book, the term tuff applies to the variety of deposits originating from volcanic eruptions of high-silica magmas.

These deposits are dominantly referred to as air-fall or ash-flow tuffs. The definition of thermal/mechanical units reflects to a large extent the general degree of welding, and the defined units correlate generally with groups of lithostratigraphic units, or in the case of the Topopah Spring Tuff, parts of a lithostratigraphic upper two Topopah Spring Tuff units, TSw1 and TSw2, are both within the densely welded, devitrified Topopah Spring Tuff.

PSBorehole Stability and Field Stress Analysis with Azimuthal Logging-while-Drilling Technology: A Case History* Saikh A. Azim1, Sankar Chowdhuri1, Salah Al-Anezi1, Anar Abdulkarim2, Ahmet Aki2, and Mohamed Samie2 Search and Discovery Article # ()** Posted Ma *Adapted from poster presentation given at AAPG/SEG International Conference & Exhibition, Energy for the Next Missing: densely welded.

Introduction. Borehole stability technology includes chemical as well as mechanical methods to maintain a stable borehole, both during and after drilling. Drilling fluids range from water to oil to complex chemical systems with properties designed for specific site conditions to aid the drilling process.

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Borehole stability in densely welded tuffs Technical Report Fuenkajorn, K ; Daemen, J J.K. The stability of boreholes, or more generally of underground openings (i.e.

including shafts, ramps, drifts, tunnels, etc.) at locations where seals or plugs are to be placed is an important consideration in seal design for a repository (Juhlin and Sandstedt, ).

are densely welded, siliceous tuffs without abundant veins; samples ODP4, 5, and 9 ( ft) are especially uniform in overall texture. XRD analyses indicate a rather homogenous composition in this interval with % quartz, % potassium feldspar, % plagioclase, and % clay.

In Wellthe base of the rhyolite sequence isFile Size: KB. Civil Mining Engineer. Contact. About. In Situ Flow Testing Of A Cement Borehole Seal In Welded Tuff. Article. Borehole stability in densely welded tuffs. Article. IN-SITU FLOW TESTING Test method Three 15 cm diameter vertical test holes were cored to a depth of 7 m in the densely welded Apache Leap tuff, near Superior Arizona, a rock very similar to tuffs encountered at Yucca Mtn.

Mechanical, petrographic and chemical similarities of the Apache Leap tuff and the Topopah Spring Tuff at Yucca Mtn were Cited by: 2. There is a progression in tuffs, from unwelded volcanic ash (the source material) to welded volcanic ash (tuff) to densely welded tuff. Further welding would result in vitrophyre, a phenocryst-bearing obsidian.

Densely welded tuffs are uncommon. This tuff, a member of. Dissolution of the feldspar in the crystal fragments and debris develops the dissolved pores that also constitute some of the most important reservoir space in welded tuff.

Moreover, the pores resulting from carbonate mineral dissolution and local microfractures are also important reservoir space in welded tuff. A group of Dutch drilling contractors and engineering consultants are working together to enhance their knowledge on borehole stability during Horizontal Directional Drilling (HDD).

The influence of arching on the stability of a borehole filled with bentonite has been tested with the geotechnical centrifuge of GeoDelft in combination with the maximum mud pressure the borehole can withstand.

Lava Creek tuff is known to be at least times as large as the deposits of the eruption of Mount St. Helens, and it had a Volcanic Explosivity Index (VEI) of 8, greater than any eruption known in the l years. The intensity of welding may decrease towards the upper margin of a deposit.

A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. BOREHOLE AND GEOHYDROLOGIC DATA FOR TEST HOLE USW UZ-6, YUCCA MOUNTAIN AREA, NYE COUNTY, NEVADA By Merrick S. Whitfield, Jr.1, Colleen M.

Cope2, and Carole L. Loskot1 ABSTRACT Test hole USW U, located kilometers west of the Nevada Test Site on a major north-trending ridge at Yucca Mountain, was dry drilled in TertiaryCited by: 3.This densely welded tuff, about m thick here, is typical of the member in most localities and generally weathers to crumbly dark-brown crudely columnar outcrops or to steep grassy slopes.

The lower member of the Lava Creek Tuff is the only part of the Yellowstone Group in which hornblende is more abundant than pyroxene.Densely welded tuffs and some basalt flows may contain clinoptilolite as fracture filling that limits the permeability of these rocks.

The cation exchange properties of these zeolite minerals allow them to pose a formidable natural barrier to the migration of cationic Cited by: 4.