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Movement history and infiltration, Cairnmuir Landslide, NZ
51A
941401 Application of infinite elements to seepage analysis in geotechnical perspective Honjo, Y; Pokharel, G Soils Found V33, N1, March 1993, P23-39 In many groundwater analyses it is convenient to identify a near field (area of interest, detailed information available) and a far field (detailed behaviour unimportant, full information not available). A new type of infinite element is proposed for the far field. It can include the infinitely distanced constant head boundary conditions from the area of disturbance. It is illustrated applied to a pumping test problem to examine performance of a cut-off wall and gives results in good agreement with observations.
941402 Environmental significance of heterogeneous metal distribution in historical Pb-Zn mine tailings heaps Merrington, G; Alloway, B J Trans Inst Min Metall (Sect A Min Ind) V102, May-Aug 1993, PA71-A74 Tailings heaps at two mines in Cornwall and Mid Wales were examined and layers of anomalously fine material with significant accumulations of Pb, Zn, Cd, and Cu relative to the bulk material found in the top 2m. These layers result from accumulation of fine particles of sulphide minerals. The base and top of these fine grained, impermeable and reduced layers are characterised by Fe oxide-cemented tailings, which show lesser but significant metal accumulation. These layers protect the bulk tailings from the full impact of weathering and groundwater percolation. The environmental consequences from disturbing these layers in site reclamation or development are discussed.
941403 Movement history and infiltration, Cairnmuir Landslide, NZ Gillon, M D; Riley, P B; Lilley, P B; Halliday, G S Proc 6th International Symposium on Landslides, Christchurch, 10-14 February 1992 V1, P103-109. Publ Rotterdam: A A Balkema, 1992 The Cairnmuir slide in the Cromwell Gorge is a translational slide composed of schist debris. Slide history has been examined by comparison of aerial photographs and logging of river terraces below the slide. Movements of 10-100mm/yr are found in the active segments. Geology and hydrology of the slide have been examined. Seasonal variations in recharge have been evaluated and their correlations with slide movement investigated. Slide movement mechanisms have been studied and remedial measures planned.
941404 Rain induced creep-rupture of Soberto Road landslide Lacerda, W A; Schilling, G H Proc 6th International Symposium on Landslides, Christchurch, 10-14 February 1992 V1, P145-152. Publ Rotterdam: A A Balkema, 1992 Continuous creep of a colluvial slope in Rio de Janeiro, which suffered a catastrophic landslide in 1966, has been monitored and relations between pore pressure and ground movement and rainfall analysed. Localised ruptures occur in exceptionally rainy seasons. Creep rates of up to 72mm/day have been recorded. Sudden increase of movement in 1990 was detected, which allowed remedial drainage to be installed before permanent stabilising measures were taken.
941405 Slurry trench cut-off walls for environmental pollution control Grube, W E Proc Symposium on Slurry Walls: Design, Construction and Quality Control, Atlantic City, 27-28 June 1991 P69-77. Publ Philadelphia: ASTM, 1992 (ASTM Special Technical Publication N1129) Cutoff walls built with the bentonite slurry trench technique are often used during remediation of hazardous waste sites. Organic compounds in the site groundwater may significantly affect cutoff wall design and performance, and backfill permeability must be tested in the presence of these contaminants. Plastic concrete, attapulgite clay slurries, and biopolymer slurries have been applied to meet site-specific requirements. Full scale testing of wall panels must be carried out to ensure adequate performance. Environmental slurry wall experience in the past decade is reviewed. 941406 Composite barrier slurry wall Cavalli, N J Proc Symposium on Slurry Walls: Design, Construction and
Quality Control, Atlantic City, 27-28 June 1991 P78-85. Publ Philadelphia: ASTM, 1992 ( A S T M Special Technical Publication Nl129) Slurry walls have been used as hydraulic barriers in numerous civil engineering projects and are now being applied to environmental projects. Few data are available on the long term performance of slurry walls, especially in chemically or physically agressive environments, and under such conditions their performance remains uncertain and unproven. To reduce risks in such conditions, the geomembrane/slurry wall has been developed, with a composite geosynthetic set in the engineered backfill. Design and construction details are presented. 941407 Hydraugers at the Via de Las Olas landslide Roth, W H; Rice, R H; Liu, D T; Cobarrubias, J Proc Conference Stability and Performance of Slopes and Embankments 11, Berkeley, 29 June-I July 1992 V2, P1349-
1364. Publ New York: ASCE, 1992 (ASCE Special Geotechnical Pubfication No 31) To minimise the potential for reactivation of the massive Via de Las Olas slide on the California coast, a subsurface drainage system of 32 hydraugers (small diameter horizontal drains) was installed in 1988. Hydrauger discharge rates and groundwater level have been monitored over a 3 year period. Results illustrate that this dewatering system can be successfully applied in low permeability siltstone/sandstone rocks provided they are fractured.
941408 Slide stabilization with stouc-fill trenches Sills, G L; Fleming, R L Proc Conference Stability and Performance of Slopes and Embankments 11, Berkeley, 29 Jane-I July 1992 V2, P13831394. Publ New York: ASCE, 1992 (ASCE Special Geotechnical Publication No 31) A method has been developed for stabilisation of shallow slides in earth slopes using gravel-fill or stone-fill trenches. It can be applied in soils with sufficient integrity to remain stable while trenches with near-vertical sides are excavated below the slip plane. These slopes can be stabilised cheaply and easily with readily available equipment. Several case examples are presented.
941401 Application of infinite elements to seepage analysis in geotechnical perspective Honjo, Y; Pokharel, G Soils Found V33, N1, March 1993, P23-39 In many groundwater analyses it is convenient to identify a near field (area of interest, detailed information available) and a far field (detailed behaviour unimportant, full information not available). A new type of infinite element is proposed for the far field. It can include the infinitely distanced constant head boundary conditions from the area of disturbance. It is illustrated applied to a pumping test problem to examine performance of a cut-off wall and gives results in good agreement with observations.
941402 Environmental significance of heterogeneous metal distribution in historical Pb-Zn mine tailings heaps Merrington, G; Alloway, B J Trans Inst Min Metall (Sect A Min Ind) V102, May-Aug 1993, PA71-A74 Tailings heaps at two mines in Cornwall and Mid Wales were examined and layers of anomalously fine material with significant accumulations of Pb, Zn, Cd, and Cu relative to the bulk material found in the top 2m. These layers result from accumulation of fine particles of sulphide minerals. The base and top of these fine grained, impermeable and reduced layers are characterised by Fe oxide-cemented tailings, which show lesser but significant metal accumulation. These layers protect the bulk tailings from the full impact of weathering and groundwater percolation. The environmental consequences from disturbing these layers in site reclamation or development are discussed.
941403 Movement history and infiltration, Cairnmuir Landslide, NZ Gillon, M D; Riley, P B; Lilley, P B; Halliday, G S Proc 6th International Symposium on Landslides, Christchurch, 10-14 February 1992 V1, P103-109. Publ Rotterdam: A A Balkema, 1992 The Cairnmuir slide in the Cromwell Gorge is a translational slide composed of schist debris. Slide history has been examined by comparison of aerial photographs and logging of river terraces below the slide. Movements of 10-100mm/yr are found in the active segments. Geology and hydrology of the slide have been examined. Seasonal variations in recharge have been evaluated and their correlations with slide movement investigated. Slide movement mechanisms have been studied and remedial measures planned.
941404 Rain induced creep-rupture of Soberto Road landslide Lacerda, W A; Schilling, G H Proc 6th International Symposium on Landslides, Christchurch, 10-14 February 1992 V1, P145-152. Publ Rotterdam: A A Balkema, 1992 Continuous creep of a colluvial slope in Rio de Janeiro, which suffered a catastrophic landslide in 1966, has been monitored and relations between pore pressure and ground movement and rainfall analysed. Localised ruptures occur in exceptionally rainy seasons. Creep rates of up to 72mm/day have been recorded. Sudden increase of movement in 1990 was detected, which allowed remedial drainage to be installed before permanent stabilising measures were taken.
941405 Slurry trench cut-off walls for environmental pollution control Grube, W E Proc Symposium on Slurry Walls: Design, Construction and Quality Control, Atlantic City, 27-28 June 1991 P69-77. Publ Philadelphia: ASTM, 1992 (ASTM Special Technical Publication N1129) Cutoff walls built with the bentonite slurry trench technique are often used during remediation of hazardous waste sites. Organic compounds in the site groundwater may significantly affect cutoff wall design and performance, and backfill permeability must be tested in the presence of these contaminants. Plastic concrete, attapulgite clay slurries, and biopolymer slurries have been applied to meet site-specific requirements. Full scale testing of wall panels must be carried out to ensure adequate performance. Environmental slurry wall experience in the past decade is reviewed. 941406 Composite barrier slurry wall Cavalli, N J Proc Symposium on Slurry Walls: Design, Construction and
Quality Control, Atlantic City, 27-28 June 1991 P78-85. Publ Philadelphia: ASTM, 1992 ( A S T M Special Technical Publication Nl129) Slurry walls have been used as hydraulic barriers in numerous civil engineering projects and are now being applied to environmental projects. Few data are available on the long term performance of slurry walls, especially in chemically or physically agressive environments, and under such conditions their performance remains uncertain and unproven. To reduce risks in such conditions, the geomembrane/slurry wall has been developed, with a composite geosynthetic set in the engineered backfill. Design and construction details are presented. 941407 Hydraugers at the Via de Las Olas landslide Roth, W H; Rice, R H; Liu, D T; Cobarrubias, J Proc Conference Stability and Performance of Slopes and Embankments 11, Berkeley, 29 June-I July 1992 V2, P1349-
1364. Publ New York: ASCE, 1992 (ASCE Special Geotechnical Pubfication No 31) To minimise the potential for reactivation of the massive Via de Las Olas slide on the California coast, a subsurface drainage system of 32 hydraugers (small diameter horizontal drains) was installed in 1988. Hydrauger discharge rates and groundwater level have been monitored over a 3 year period. Results illustrate that this dewatering system can be successfully applied in low permeability siltstone/sandstone rocks provided they are fractured.
941408 Slide stabilization with stouc-fill trenches Sills, G L; Fleming, R L Proc Conference Stability and Performance of Slopes and Embankments 11, Berkeley, 29 Jane-I July 1992 V2, P13831394. Publ New York: ASCE, 1992 (ASCE Special Geotechnical Publication No 31) A method has been developed for stabilisation of shallow slides in earth slopes using gravel-fill or stone-fill trenches. It can be applied in soils with sufficient integrity to remain stable while trenches with near-vertical sides are excavated below the slip plane. These slopes can be stabilised cheaply and easily with readily available equipment. Several case examples are presented.