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Trenching and shoring. Recent developments
247A
84638O Site investigations for unretalned excavations in a soft peaty deposit Sandroni, S S; Silva, J M J; Pinheiro, J C N Can Geotech d V21, NI, Feb 1984, P36-59 On the swampy land around Itaipu Lagoon, Brazil, artificial islands are being created by hydraulic filling. Their periphery consists of retaining walls resting on sand cushions. A complete site and laboratory investigation was carried out. An instrumented 5m deep trial trench (for the walls and sand cushions) was monitored during excavation and for a 45 day repose stage. In both stages failure was avoided by keeping the water inside the trench at its original level. Finally, failure was induced by pumping water out of the trench.
846381 Conditions of contract for ground investigation Cottington, J Civ Engng, London Dec 1983, P27-31 Reviews the Conditions of Contract for Ground Investigation, 1983, highlighting changes since the 5th edition.
846382 Advances in surveying practice (In German) Freiberger Forschungsh NA682, 1983, 233P
846385 in-situ heat transfer experiment (ISHTE) Percival, C M; McVey, D F; Olson, L O; Silva, A J Marine Geotechnol VS, N3-4, 1984, P361-377 The In Situ Heat Transfer Experiment, planned as part of the Subseabed Waste Disposal Programme, is described. The experiment's objectives are: (1) to provide data on the effects of heating on the response of in situ sediment for use in verifying laboratory results and computer models, and (2) to develop the technology to perform waste isolation experiments on and in the ocean bed at depth.
846386 Premining investigations for Iongwnli coal mining Chugh, Y P; Caudle, R D; Agarwala, V K In: State-of-the-Art of Ground Control in Lo~gwall Mining and Mining Subsidence P3-12. Publ New York: AIME, 1982 At present, very little premining exploration data is collected by mining companies before embarking on a Iongwali mining project. This paper: (1) identifies premining data requirements, (2) discusses how this data can be obtained during exploration, and (3) proposes an exploration programme and provides estimates of the costs involved.
Planning, geotechnical and structural mapping
Seventeen papers dealing with different aspects of mine surveying. Topics include surveying techniques for prospecting, measurement of stress states and deformation.
846387
846383 Developments in precision casing joint and radioactive measurements for compaction monitoring
Arizona Lund, W R; Euge, K M Bull Assoc Engng Geol V21,172, May 1984, P179-189
Allen, D R J Pet Technol V36, NS. May 1984, P805-810 A method has been developed in Wilmington field, CA, for measuring oil zone compaction and expansion by the deformation in well casing. Possible formation compaction is also directly investigated by locating radioactive bullets previously placed in the formation. The addition of a downhole oedometer and different recording techniques have improved measurement accuracy. Random joint lengths have been repeatedly measured and remeasured under field conditions with a standard deviation of 0.0159ft (4.8mm). An alternative system, developed by Ruedrich et al, utilized multiple collar Iocators and specially milled casing joints. Both systems can be applied to field situations where random joint lengths are found; however, the oedometer system should be more accurate under these conditions. Auth.
846384 Evaluation of the geological stability and predictabifity of sediment of the Northern Bermuda Rise by the Subseahed Disposal Program Laine, E P; Heath, G R; Ayer, E; Kominz, M Marine Geotectmol VS, N3-4, 1984, P215-233 The Northern Bermuda Rise has been the subject of intensive study as to its suitability as a repository of nuclear waste. The primary criteria for this are whether or not the region is sui~ciently geologically predictable and stable to guarantee the safety of a repository, and whether or not the sediments themselves will form a good enough barrier to leakage of waste. Analysis of cores and seismic profiles suggests that integrity of a repository in this region could not be guaranteed due to the presence of strong bottom currents.
Detailed inspection and geological mapping of construction excavations at Palo Verde Nuclear Generating Station,
Facilities at Palo Verde have been grouped into Category 1 and Non-Category 1 structures: Category 1 facilities are critical to plant operation and safety. Excavations for Category 1 are mapped in detail; Non-Category 1 excavations are inspected and photographed. Detailed mapping has confirmed the geologic model developed in earlier investigations. No evidence of faulting or other geological processes which might compromise site integrity has been found.
846388 Sub-surface fracture maps predicted from borehole data: an example from the Eye-Dashwa pluton, Atikokan, Canada Stone, D lnt d Rock Mech Min Sci V21, N4, Aug 1984, P183-194 The width and orientation of epidote- and chlorite-filled fractures in the Eye-Dashwa pluton and how this may be used to predict the length, shape and displacement of discontinuities observed in drill cores is discussed. The fractures tend to be elliptical in cross-section, such that the median width of both the fracture and the associated alteration haloes increases proportionally with an increase in fracture length and displacement. The abundance of splays increases as a function of displacement. A procedure is defined for constructing fracture maps based on drill core measurements in order to estimate the shape of individual fractures.
Core recovery, logging, probing, boring and sampiing See also: 846011, 846398, 846399, 846407
84638O Site investigations for unretalned excavations in a soft peaty deposit Sandroni, S S; Silva, J M J; Pinheiro, J C N Can Geotech d V21, NI, Feb 1984, P36-59 On the swampy land around Itaipu Lagoon, Brazil, artificial islands are being created by hydraulic filling. Their periphery consists of retaining walls resting on sand cushions. A complete site and laboratory investigation was carried out. An instrumented 5m deep trial trench (for the walls and sand cushions) was monitored during excavation and for a 45 day repose stage. In both stages failure was avoided by keeping the water inside the trench at its original level. Finally, failure was induced by pumping water out of the trench.
846381 Conditions of contract for ground investigation Cottington, J Civ Engng, London Dec 1983, P27-31 Reviews the Conditions of Contract for Ground Investigation, 1983, highlighting changes since the 5th edition.
846382 Advances in surveying practice (In German) Freiberger Forschungsh NA682, 1983, 233P
846385 in-situ heat transfer experiment (ISHTE) Percival, C M; McVey, D F; Olson, L O; Silva, A J Marine Geotechnol VS, N3-4, 1984, P361-377 The In Situ Heat Transfer Experiment, planned as part of the Subseabed Waste Disposal Programme, is described. The experiment's objectives are: (1) to provide data on the effects of heating on the response of in situ sediment for use in verifying laboratory results and computer models, and (2) to develop the technology to perform waste isolation experiments on and in the ocean bed at depth.
846386 Premining investigations for Iongwnli coal mining Chugh, Y P; Caudle, R D; Agarwala, V K In: State-of-the-Art of Ground Control in Lo~gwall Mining and Mining Subsidence P3-12. Publ New York: AIME, 1982 At present, very little premining exploration data is collected by mining companies before embarking on a Iongwali mining project. This paper: (1) identifies premining data requirements, (2) discusses how this data can be obtained during exploration, and (3) proposes an exploration programme and provides estimates of the costs involved.
Planning, geotechnical and structural mapping
Seventeen papers dealing with different aspects of mine surveying. Topics include surveying techniques for prospecting, measurement of stress states and deformation.
846387
846383 Developments in precision casing joint and radioactive measurements for compaction monitoring
Arizona Lund, W R; Euge, K M Bull Assoc Engng Geol V21,172, May 1984, P179-189
Allen, D R J Pet Technol V36, NS. May 1984, P805-810 A method has been developed in Wilmington field, CA, for measuring oil zone compaction and expansion by the deformation in well casing. Possible formation compaction is also directly investigated by locating radioactive bullets previously placed in the formation. The addition of a downhole oedometer and different recording techniques have improved measurement accuracy. Random joint lengths have been repeatedly measured and remeasured under field conditions with a standard deviation of 0.0159ft (4.8mm). An alternative system, developed by Ruedrich et al, utilized multiple collar Iocators and specially milled casing joints. Both systems can be applied to field situations where random joint lengths are found; however, the oedometer system should be more accurate under these conditions. Auth.
846384 Evaluation of the geological stability and predictabifity of sediment of the Northern Bermuda Rise by the Subseahed Disposal Program Laine, E P; Heath, G R; Ayer, E; Kominz, M Marine Geotectmol VS, N3-4, 1984, P215-233 The Northern Bermuda Rise has been the subject of intensive study as to its suitability as a repository of nuclear waste. The primary criteria for this are whether or not the region is sui~ciently geologically predictable and stable to guarantee the safety of a repository, and whether or not the sediments themselves will form a good enough barrier to leakage of waste. Analysis of cores and seismic profiles suggests that integrity of a repository in this region could not be guaranteed due to the presence of strong bottom currents.
Detailed inspection and geological mapping of construction excavations at Palo Verde Nuclear Generating Station,
Facilities at Palo Verde have been grouped into Category 1 and Non-Category 1 structures: Category 1 facilities are critical to plant operation and safety. Excavations for Category 1 are mapped in detail; Non-Category 1 excavations are inspected and photographed. Detailed mapping has confirmed the geologic model developed in earlier investigations. No evidence of faulting or other geological processes which might compromise site integrity has been found.
846388 Sub-surface fracture maps predicted from borehole data: an example from the Eye-Dashwa pluton, Atikokan, Canada Stone, D lnt d Rock Mech Min Sci V21, N4, Aug 1984, P183-194 The width and orientation of epidote- and chlorite-filled fractures in the Eye-Dashwa pluton and how this may be used to predict the length, shape and displacement of discontinuities observed in drill cores is discussed. The fractures tend to be elliptical in cross-section, such that the median width of both the fracture and the associated alteration haloes increases proportionally with an increase in fracture length and displacement. The abundance of splays increases as a function of displacement. A procedure is defined for constructing fracture maps based on drill core measurements in order to estimate the shape of individual fractures.
Core recovery, logging, probing, boring and sampiing See also: 846011, 846398, 846399, 846407