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Foundation aspects of Mt. Henry Bridge, Perth
175A ment specially designed and considerably cheaper than that commercially available. Field data were analysed using semi-log and curve matching techniques. Results indicated significant wellbore damage which would have led to erroneous hydraulic conductivities if slug tests alone were used. The techniques described offer accurate and cost-effective measurements of hydraulic conductivity.
856051 Permeability of dune sand/deslimed mill tailing mixes for use as hydraulic mine fill Alhadar, H: Thomas. E G Bull Proc Australas lnst Min Metall V289, NS. Nov/Dec 1984, P277-282 Results of a laboratory test programme measuring the effect on permeability produced by progressively increasing additions of a relatively fine material (deslimed mill tailing) to a relatively coarse material (natural dune sand) are reported. These materials are widely used as mine fill materials, particularly in cut and fill mining, and permeability (or percolation rate) is an important operating parameter in that it controls rate of fill dewatering after hydraulic placement. As the proportion of deslimed mill tailing was increased, percolation rate was found to fall initially rapidly from around 1700mm/h for dune sand and then much less rapidly to around 250mm/h for deslimed mill tailing. For all mixes and all test conditions, percolation rate was found to be more than adequate for satisfactory performance in practice. Auth.
856052 Foundation aspects of Mt. Henry Bridge, Perth Jewell, R J; Michael, K C; Smith, G C Proc 4th Australia-New Zealand Conference on Geomechanics, Perth, Western Australia, 14-18 May 1984 V2, P385-396. Publ Barton. Inst of Engineers, 1984 Information on the geotechnical investigations undertaken, the soil profile determined and the foundation systems reviewed for the Mt Henry Bridge over the Canning River, Perth, Western Australia, is presented. Site investigations, which included pressuremeter testing, SPT and vane shear tests, in addition to triaxial and other laboratory testing, established the soil parameters for the foundation design. Bored piles and various types of driven piles, approximately 40m long, are discussed and details given of an adopted composite pile founded in sandy silty clay, Full scale pile load tests are also reported. Auth.
856053 Microcracking of rock and the prediction of fracture and failure Strauss, A M In: Rock ~lechanics in Productivity and Protection (paper to the 25th Symposium on Rock Mechanics, Evanston, Illinois, 25-27 June 1984) P55-63. Publ New York: AIME. 1984 The application of the theory of period doubling to the description of the formation of microcracks in rocks is illustrated. The fundamental mathematics is described and a method of prediction is proposed. The invariance (universal constants) of a generic microfracturing (damage) process is described. Finally, the method is presented as a deterministic method of predicting the failure of an engineering material while keeping track of the amount of damage that has occurred at any point. Auth.
C o m p r e s s i b i l i t y , swelling and c o n s o l i d a t i o n 856054 Settlement characteristics of waste fill sites Walker, L K; Kurzeme, M Proc 4th Australia-New Zealand Conference on Geomechanics, Perth, Western Australia, 14-18 May 1984 VI, P346-350. Publ Barton: lnst q[ Engineers. 1984 A method of estimating the magnitude of surface settlement of waste fill sites under the effect of surcharge loading. The method is based on the settlement characteristics of waste fill observed at two development sites, and a comparison of the behaviour of waste fill and natural highly compressible soils. Auth.
856055 Origin of shape changes of sand and silt in a high-gradient stream system Kennedy, S K; Ehrlich, R J Sediment Petrol V55, N1, Jan 1985, P57-64 To clarify the problem that changes in shape of sand and silt in streams may be a reflection of changes in source rock rather than the progressive effects of transport, stream sediment samples were collected in two drainage basins on the west flank of the Bighorn Mountains, Wyoming, USA. Three size fractions fine sand, very fine sand, and coarse silt - were studied, using Fourier analysis and the scanning electron microscope. The methods, results and conclusions are reported for the changes in shape of quartz sand and silt. 856056 Classification of deep sea, fine-grained sediments Dean, WE: Leinen, M: Stow, D A J Sediment Petrol V55, N2, March 1985. P250-256 A descriptive classification scheme in which deep-sea, finegrained sediments are placed within a three component system of calcareous-biogenic, and nonbiogenic components. In a three-step procedure the user assesses whether the dominant biogenic component is siliceous or calcareous, and what the relative abundances of the biogenic components are within limits of 10, 25 and 50°0.
856057 Borehole mining of deep phosphate ore in St. Johns County, Florida Savanick, G A Min Engng 1/37, N2, Feb 1985, P144-148 Borehole (slurry) mining, where a tool incorporating a water-jet cutter and a downhole slurry pump mines phosphate through a borehole, was field tested as part of a US Bureau of Mines programme to increase the domestic availability of critical minerals. The borehole was filled with water during mining for roof support and to assist slurry pumping. Underwater cutting was enhanced with an air-shrouded water jet. Mined cavities were backfilled to prevent subsidence after abandonment. Roof subsidence during mining was avoided only when the cavity was filled with water. Environmental monitoring before, during and after mining included hydrological studies and measurements of water quality. Auth.
856058 Observations of soil freezing and frost heave at Inuvik, Northwest Territories, Canada Smith, M V Can J Earth Sci V22, N2, Feb 1985. P283-290 Field observations of soil temperature, moisture regime, and frost heave in silty clay hummocks at Inuvik, Canada, reveal that a significant amount of moisture migration and frost heave occur within frozen soil at temperatures down to -2.4 deg C. The
856051 Permeability of dune sand/deslimed mill tailing mixes for use as hydraulic mine fill Alhadar, H: Thomas. E G Bull Proc Australas lnst Min Metall V289, NS. Nov/Dec 1984, P277-282 Results of a laboratory test programme measuring the effect on permeability produced by progressively increasing additions of a relatively fine material (deslimed mill tailing) to a relatively coarse material (natural dune sand) are reported. These materials are widely used as mine fill materials, particularly in cut and fill mining, and permeability (or percolation rate) is an important operating parameter in that it controls rate of fill dewatering after hydraulic placement. As the proportion of deslimed mill tailing was increased, percolation rate was found to fall initially rapidly from around 1700mm/h for dune sand and then much less rapidly to around 250mm/h for deslimed mill tailing. For all mixes and all test conditions, percolation rate was found to be more than adequate for satisfactory performance in practice. Auth.
856052 Foundation aspects of Mt. Henry Bridge, Perth Jewell, R J; Michael, K C; Smith, G C Proc 4th Australia-New Zealand Conference on Geomechanics, Perth, Western Australia, 14-18 May 1984 V2, P385-396. Publ Barton. Inst of Engineers, 1984 Information on the geotechnical investigations undertaken, the soil profile determined and the foundation systems reviewed for the Mt Henry Bridge over the Canning River, Perth, Western Australia, is presented. Site investigations, which included pressuremeter testing, SPT and vane shear tests, in addition to triaxial and other laboratory testing, established the soil parameters for the foundation design. Bored piles and various types of driven piles, approximately 40m long, are discussed and details given of an adopted composite pile founded in sandy silty clay, Full scale pile load tests are also reported. Auth.
856053 Microcracking of rock and the prediction of fracture and failure Strauss, A M In: Rock ~lechanics in Productivity and Protection (paper to the 25th Symposium on Rock Mechanics, Evanston, Illinois, 25-27 June 1984) P55-63. Publ New York: AIME. 1984 The application of the theory of period doubling to the description of the formation of microcracks in rocks is illustrated. The fundamental mathematics is described and a method of prediction is proposed. The invariance (universal constants) of a generic microfracturing (damage) process is described. Finally, the method is presented as a deterministic method of predicting the failure of an engineering material while keeping track of the amount of damage that has occurred at any point. Auth.
C o m p r e s s i b i l i t y , swelling and c o n s o l i d a t i o n 856054 Settlement characteristics of waste fill sites Walker, L K; Kurzeme, M Proc 4th Australia-New Zealand Conference on Geomechanics, Perth, Western Australia, 14-18 May 1984 VI, P346-350. Publ Barton: lnst q[ Engineers. 1984 A method of estimating the magnitude of surface settlement of waste fill sites under the effect of surcharge loading. The method is based on the settlement characteristics of waste fill observed at two development sites, and a comparison of the behaviour of waste fill and natural highly compressible soils. Auth.
856055 Origin of shape changes of sand and silt in a high-gradient stream system Kennedy, S K; Ehrlich, R J Sediment Petrol V55, N1, Jan 1985, P57-64 To clarify the problem that changes in shape of sand and silt in streams may be a reflection of changes in source rock rather than the progressive effects of transport, stream sediment samples were collected in two drainage basins on the west flank of the Bighorn Mountains, Wyoming, USA. Three size fractions fine sand, very fine sand, and coarse silt - were studied, using Fourier analysis and the scanning electron microscope. The methods, results and conclusions are reported for the changes in shape of quartz sand and silt. 856056 Classification of deep sea, fine-grained sediments Dean, WE: Leinen, M: Stow, D A J Sediment Petrol V55, N2, March 1985. P250-256 A descriptive classification scheme in which deep-sea, finegrained sediments are placed within a three component system of calcareous-biogenic, and nonbiogenic components. In a three-step procedure the user assesses whether the dominant biogenic component is siliceous or calcareous, and what the relative abundances of the biogenic components are within limits of 10, 25 and 50°0.
856057 Borehole mining of deep phosphate ore in St. Johns County, Florida Savanick, G A Min Engng 1/37, N2, Feb 1985, P144-148 Borehole (slurry) mining, where a tool incorporating a water-jet cutter and a downhole slurry pump mines phosphate through a borehole, was field tested as part of a US Bureau of Mines programme to increase the domestic availability of critical minerals. The borehole was filled with water during mining for roof support and to assist slurry pumping. Underwater cutting was enhanced with an air-shrouded water jet. Mined cavities were backfilled to prevent subsidence after abandonment. Roof subsidence during mining was avoided only when the cavity was filled with water. Environmental monitoring before, during and after mining included hydrological studies and measurements of water quality. Auth.
856058 Observations of soil freezing and frost heave at Inuvik, Northwest Territories, Canada Smith, M V Can J Earth Sci V22, N2, Feb 1985. P283-290 Field observations of soil temperature, moisture regime, and frost heave in silty clay hummocks at Inuvik, Canada, reveal that a significant amount of moisture migration and frost heave occur within frozen soil at temperatures down to -2.4 deg C. The