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Case study of subsurface drains at Rogans Hill
155A 893392 Experience with construction of antifiltration curtains by jet method Smorodinov, M I; Aleksandrovskii. Y V; lvanov, V D
Soil Mech Found gngng V25. NI, Jan-Feb 1988, P13-16 Groundwater control has become increasingly important as dimensions of foundation trenches and hydraulic structures have grown and environmental protection has become a public issue. The jet method of grouting is one of the most efficient and economic methods of installing impervious curtains. Water/air jets are used to excavate a wall from predrilled holes, and heavy grout material is simultaneously introduced. Practical applications, limitations, and equipment are described.
893396 Caflsbrooke Avenue landslide Forrester, K
Proc Sympos&m on Soil Slope Instability and Stabilisation, Sydney, 30 Nov-2 Dec 1987 P337-346. Publ Rotterdam: A A Balkema. 1987 Failure occurred by a block sliding in an area of a conglomerate cap over coal, clay, coal, and siltstone layers. Two coal layers acted as aquifers,and fissures in the cap as conduits for water. A remedial program of horizontal drains and relief wells was installed. In addition, in one area of low safety factor even with effective drainage, dowels or anchors were used. Acoustic emission monitoring showed most of the slide was stabilised by drainage alone.
893393 AI(M) Hatfieid tunnel Palmer, M J; Lowndes, J F L
893397 Case study of subsurface drains at Rogans Hill Jeffery, R P
Proc Tunnelling '88, London, 18-21 April 1988 P243-256. Publ London: IMM. 1988
Proc Symposium on Soil Slope Instability and Stabilisation, Sydney, 30 Nov-2 Dec 1987 P347-351. Publ Rotterdam: A A Balkema, 1987
The geology at the tunnel site is gravel, silts and alluvium over boulder clay and chalk bedrock. A perched water table is 6m below ground level and 2m above proposed road level. Construction within a watertight box was too expensive, and so a permanent dewatering system using French drains to lower the water table was installed. The tunnel was constructed using the cut and cover method. Problems associated with electrical and mechanical services and working at a busy urban site are discussed.
893394 Thawing front analysis - access road stability Johansen, N I; Lozano, N
Proc 5th Annual Workshop Generic Mineral Technology Center Mine Systems Design and Ground Control, Tuscaloosa, 26-27 Oct 1987 P119-128. Publ Blacksburg: Virginia Polytechnic and State Unicersity, 1987 Temperatures were monitored for over a year around culverts at an Alaskan mine, to study factors affecting thaw time in the spring. Coarse materials were seen to remain ice free and warmer than sandy gravels. Culverts with continuous water flow remained warmer as long as flow continued. The size of the culvert influenced freezing rate of the surrounding ground. French drains are suggested as possible cross drainage structures for small seams and surface drainage.
The extreme sensitivity of areas identified as unstable was illustrated when minor excavation caused instability and development of tension cracks, and revealed seepage outlets. Immediate remedial measures included reinstatement of the cut area with compacted fill and installation of deep surface drains. Previously wetted seepage areas became suitable for recreational use.
893398 Contribution of flowmeter measurements in wells bored for stabilizing landslides Parriaux, A
Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P463-464. Publ Rotterdam: A A Balkema, 1988 Landslides may be effectively stabilised by draining the sliding mass and bedrock (if possible) using pumping through vertical wells. A sensitive propeller flowmeter may be employed to detect water bearing layers to aid drainage design. This technique was employed at a site in the Swiss AIps, where the flowmeter indicated the fractured shale bedrock was the source of water, not the gravel moraine as previously thought.
Influence of dynamic loads 893395 Speers Point landslides Fell, R; Sullivan, T D; Parker, C
Proc Symposium on Soil Slope Instability and Stabilisation, Sydney, 30 Nov-2 Dec 1987 P325-331. Publ Rotterdam: A A Balkema, 1987 The region was investigated to assess areal extent of past slides and for zoning for development. Slides occurred in coarse colluvium underlain by claystone with nearly horizontal bedding. Piezometric levels were variable across the slides and sensitive to rainfall. Analysis showed factors of safety approached zero as water table neared ground surface, and detected a low strength plane in claystone at the slide base. Possible development of the sliding geology over historical timescales is illustrated. Stabilization by improved drainage was suggested.
893399 Plane strain soil-structure interaction model Dangla, P
Earthq Engng Struct Dynam VI6, Ng, Nov 1988. P1115-1128 An analysis is presented which uses the BEM to study the response of a homogeneous, isotropic linear elastic soil, and FEM to describe the response of the structure and possibly a finite part of the inhomogeneous nonlinear soil making up the half space. Far field displacement at the free surface is approximated by an outgoing Rayleigh wave. Incident P, SV and Rayleigh waves are considered. Results indicate amplification and attenuation with frequency of structural motion over certain frequency ranges for Rayleigh waves and P or SV waves respectively.
1989 Pergamon Press plc. Reproduction not permitted
Soil Mech Found gngng V25. NI, Jan-Feb 1988, P13-16 Groundwater control has become increasingly important as dimensions of foundation trenches and hydraulic structures have grown and environmental protection has become a public issue. The jet method of grouting is one of the most efficient and economic methods of installing impervious curtains. Water/air jets are used to excavate a wall from predrilled holes, and heavy grout material is simultaneously introduced. Practical applications, limitations, and equipment are described.
893396 Caflsbrooke Avenue landslide Forrester, K
Proc Sympos&m on Soil Slope Instability and Stabilisation, Sydney, 30 Nov-2 Dec 1987 P337-346. Publ Rotterdam: A A Balkema. 1987 Failure occurred by a block sliding in an area of a conglomerate cap over coal, clay, coal, and siltstone layers. Two coal layers acted as aquifers,and fissures in the cap as conduits for water. A remedial program of horizontal drains and relief wells was installed. In addition, in one area of low safety factor even with effective drainage, dowels or anchors were used. Acoustic emission monitoring showed most of the slide was stabilised by drainage alone.
893393 AI(M) Hatfieid tunnel Palmer, M J; Lowndes, J F L
893397 Case study of subsurface drains at Rogans Hill Jeffery, R P
Proc Tunnelling '88, London, 18-21 April 1988 P243-256. Publ London: IMM. 1988
Proc Symposium on Soil Slope Instability and Stabilisation, Sydney, 30 Nov-2 Dec 1987 P347-351. Publ Rotterdam: A A Balkema, 1987
The geology at the tunnel site is gravel, silts and alluvium over boulder clay and chalk bedrock. A perched water table is 6m below ground level and 2m above proposed road level. Construction within a watertight box was too expensive, and so a permanent dewatering system using French drains to lower the water table was installed. The tunnel was constructed using the cut and cover method. Problems associated with electrical and mechanical services and working at a busy urban site are discussed.
893394 Thawing front analysis - access road stability Johansen, N I; Lozano, N
Proc 5th Annual Workshop Generic Mineral Technology Center Mine Systems Design and Ground Control, Tuscaloosa, 26-27 Oct 1987 P119-128. Publ Blacksburg: Virginia Polytechnic and State Unicersity, 1987 Temperatures were monitored for over a year around culverts at an Alaskan mine, to study factors affecting thaw time in the spring. Coarse materials were seen to remain ice free and warmer than sandy gravels. Culverts with continuous water flow remained warmer as long as flow continued. The size of the culvert influenced freezing rate of the surrounding ground. French drains are suggested as possible cross drainage structures for small seams and surface drainage.
The extreme sensitivity of areas identified as unstable was illustrated when minor excavation caused instability and development of tension cracks, and revealed seepage outlets. Immediate remedial measures included reinstatement of the cut area with compacted fill and installation of deep surface drains. Previously wetted seepage areas became suitable for recreational use.
893398 Contribution of flowmeter measurements in wells bored for stabilizing landslides Parriaux, A
Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI, P463-464. Publ Rotterdam: A A Balkema, 1988 Landslides may be effectively stabilised by draining the sliding mass and bedrock (if possible) using pumping through vertical wells. A sensitive propeller flowmeter may be employed to detect water bearing layers to aid drainage design. This technique was employed at a site in the Swiss AIps, where the flowmeter indicated the fractured shale bedrock was the source of water, not the gravel moraine as previously thought.
Influence of dynamic loads 893395 Speers Point landslides Fell, R; Sullivan, T D; Parker, C
Proc Symposium on Soil Slope Instability and Stabilisation, Sydney, 30 Nov-2 Dec 1987 P325-331. Publ Rotterdam: A A Balkema, 1987 The region was investigated to assess areal extent of past slides and for zoning for development. Slides occurred in coarse colluvium underlain by claystone with nearly horizontal bedding. Piezometric levels were variable across the slides and sensitive to rainfall. Analysis showed factors of safety approached zero as water table neared ground surface, and detected a low strength plane in claystone at the slide base. Possible development of the sliding geology over historical timescales is illustrated. Stabilization by improved drainage was suggested.
893399 Plane strain soil-structure interaction model Dangla, P
Earthq Engng Struct Dynam VI6, Ng, Nov 1988. P1115-1128 An analysis is presented which uses the BEM to study the response of a homogeneous, isotropic linear elastic soil, and FEM to describe the response of the structure and possibly a finite part of the inhomogeneous nonlinear soil making up the half space. Far field displacement at the free surface is approximated by an outgoing Rayleigh wave. Incident P, SV and Rayleigh waves are considered. Results indicate amplification and attenuation with frequency of structural motion over certain frequency ranges for Rayleigh waves and P or SV waves respectively.
1989 Pergamon Press plc. Reproduction not permitted