- Characterizing Stress Fields in the Upper Crust using Joint Orientation Distributions
- J.T. Engelder ; A.E. Whitaker
- Journal of Structural Geology 27 (2005) 1778?1787
- Year: 2005
- Engineering Geology
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- Tectonic implications drawn from differences in the surface morphology on two joint sets in the Appalachian Valley and Ridge, Virginia
- J.T. Engelder
- Geological Society of America. Geology, Vol. 32, No. 5, pp. 413?416
- Year: 2004
- Engineering Geology
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- The orientation distribution of single joint sets
- J.T. Engelder ; J. Delteil
- Cosgrove, J.W., and Engelder, T., (eds) 2004. The Initiation, Propagation, and Arrest of Joints and other Fractures: Geological Society, London Special Publications, 231, 285-297
- Year: 2004
- Engineering Geology
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- Indentation Pits: A product of incipient slip on joints with a mesotopography
- J.T. Engelder ; K. Schulmann ; O. Lexa
- Cosgrove, J.W., and Engelder, T., (eds) 2004. The Initiation, Propagation, and Arrest of Joints and other Fractures: Geological Society, London Special Publications, 231, 315-324
- Year: 2004
- Engineering Geology
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- Magnetic and mineral fabric development in the Ordovician Martinsburg Formation in the Central Appalachian Fold and Thrust Belt, Pennsylvania
- J.T. Engelder ; A.M. Hirt ; W. Lowrie ; C. Luneburg ; H. Lebit
- Martin-Hernandez, F., Luneburg, C.M., Aubourg, C., and Jackson, M., (eds) 2004. Magnetic Fabric: Methods and Applications: Geological Society London, Special Publications, 238, 109-126
- Year: 2004
- Engineering Geology
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- Preferential jointing of Upper Devonian black shale, Appalachian Plateau, USA: Evidence supporting hydrocarbon generation as a joint-driving mechanism
- J.T. Engelder ; G.G. Lash ; S. Loewy
- Cosgrove, J.W., and Engelder, T., (eds) 2004. The initiation, propagation, and arrest of joints and other fractures: Geological Society of London Special Publications, v. 231, p. 129-151
- Year: 2004
- Engineering Geology
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- The Feedback between joint-zone development and downward erosion of regurarly spaced canyons in the Navajo Sandstone, Zion National Park, Utah
- J.T. Engelder ; C.M. Rogers
- Cosgrove, J.W., and Engelder, T., (eds) 2004. The initiation, propagation, and arrest of joints and other fractures: Geological Society of London Special Publications, v. 231, p. 49-71
- Year: 2004
- Engineering Geology
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- A Creative Solution to Problems with Foundation Construction in Karst
- D. Dotson ; F. Tarquinio
- Book Title / Journal: Ninth Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst
- Year: 2003
- Foundation Design / Construction ; Engineering Geology
- Keywords: karst ; foundation construction ; Micropiles
- Description
- Karst is a problematic geology located throughout the United States. It is
problematic because it is very hard; however the mineral composition and the near
vertical, pinnacled bedding of the bedrock (limestone) is vulnerable to the formation of
solution cavities and sinkholes. The upper layers of the limestone are typically polluted
with voids, massive clay seams and artesian conditions. The overburden soils above the
limestone are typically silts and clays that are susceptible to large settlements when
heavy foundation loads are placed on them. For heavily loaded structures or structures
that are very sensitive to settlement, deep foundations are necessary.
Traditional deep foundations include drilled cast-in-place concrete caissons and
driven piles. These foundation types typically transfer the foundation loads to
competent rock at depth. However, in the karstic formations, ”competent rock” may be
underlain by voids and clay seams. Therefore, the actual load-carrying capacity of
foundations bearing above these problem zones may be less than required.
A solution to avoiding these problems and installing foundation elements with
adequate capacity would be to use micropiles as a deep foundation system. Micropiles
are drilled and grouted piles typically ranging from 5 to 12 inches in diameter. Their
capacity in both soil and rock is derived entirely from friction; nominal capacity derived
from end bearing is conservatively neglected. In karst areas where several layers of
bedrock must be penetrated, the micropiles are readily advanced through the hard strata
and socketed into competent bedrock. However, the ultimate capacity of micropiles is
entirely dependent on the development of an adequate bond between the pile and the
rock socket with the bond zone. This paper concludes that not all micropile installation
techniques are equally reliable. Recommendations are proposed to improve the quality
of micropiles installed in karst topography and to lower the risk of capacity problems by
the careful selection of appropriate installation techniques.
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- The basement versus the no-basement hypotheses for folding within the Appalachian Plateau Detachment Sheet
- J.T. Engelder ; M.A. Scanlin
- American Journal of Science, Vol. 303, June, 2003, P. 519?563
- Year: 2003
- Engineering Geology
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- The Plateau climb-out zone beneath the Allegheny Front and Deer Park Anticline, southwestern Pennsylvania: Characteristics of a geologic speed Bump
- J.T. Engelder ; M.A. Scanlin
- 68th Annual Field Conference of Pennsylvania Geologists, Altoona, PA, pp. 42-54
- Year: 2003
- Engineering Geology
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- The state of stress in the limb of the Split Mountain anticline, Utah: constraints placed by transected joints
- J.T. Engelder ; L.J. Silliphant ; M.R. Gross
- Journal of Structural Geology 24 (2002) 155-172. Elsevier Science Ltd
- Year: 2002
- Engineering Geology
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- Geologically-Constrained Mineral Potential Mapping - Examples from the Philippines
- E.J.M. Carranza
- PhD thesis, Delft university, Department of Civil Engineering and Geosciences
- Year: 2002
- Engineering Geology
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- Geologic evidence of natural hydraulic fractures and stress rotations
- A.R. Ingraffea ; T. Engelder ; B.J. Carter
- International Association for Computer Methods and Advances in Geomechanics: Annual Meeting, Tuscon Arizona. p. 1-10
- Year: 2001
- Engineering Geology
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- Water table control
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- Chapter 10. Part 624 Drainage National Engineering Handbook. United States Department of Agriculture Natural Resources Conservation Service
- Year: 2001
- Engineering Geology
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- 1999 Glossop Lecture
- E. Hoek
Putting numbers to Geology - an Engineer's Viewpoint. The Second Glossop Lecture, Quarterly Journal of Engineering Geology, 32, No. 1, 1-19, 1999. - Year: 2001
- Engineering Geology ; Rock Mechanics ; Rock Mass Characterization
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