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Full-Text Articles in Geotechnical Engineering
A Case Study Of Success To Structures Founded On Expansive Soils, Zhang Shixuan
A Case Study Of Success To Structures Founded On Expansive Soils, Zhang Shixuan
International Conference on Case Histories in Geotechnical Engineering
Since 1979, in accordance with the design program given by the author, no more than ) storied buildings with an areas of more than 200,000 square metres have been built in the expansive soil area of Guangxi Zhuang Autonomous Region and Guangdong Province in South China. The different measures have been adopted according to specification of light, medium and heavy expansive soil. Through the test of special weather and the deformation observation for 3 to 7 years, it has been proved that the intact rate of the buildings has reached 90-98 percent. This paper mainly expounds three cases and has …
Excessive Seepage Losses At Westwood Lake Dam, B. Bailey, E. Bloom, T. R. West, J. A. Mundell
Excessive Seepage Losses At Westwood Lake Dam, B. Bailey, E. Bloom, T. R. West, J. A. Mundell
International Conference on Case Histories in Geotechnical Engineering
Excessive seepage losses at Westwood Lake Darn in east-central Indiana were apparent in 1974 during first filling of the lake when seepage areas developed downstream of the dam and abutments. Several remedial studies were performed which included additional test borings, field and laboratory tests, installation of observation wells, and a review of the site geology and hydrology. Data and observations from these studies were used to develop semi-quantitative assessments of seepage loss rates as related to lake levels. These analyses served as a basis for design of a major repair which consisted of blanketing a significant portion of the lake …
Field Observation And Finite Element Analysis Of A Subway Excavation, Roberto Azevedo, Luis Anibal Santos
Field Observation And Finite Element Analysis Of A Subway Excavation, Roberto Azevedo, Luis Anibal Santos
International Conference on Case Histories in Geotechnical Engineering
This paper analyzes a braced excavation executed during the construction of Rio de Janeiro City subway along a street (Catete Street) in which several old and historical buildings existed and should be preserved. The excavation had an average depth of 13 meters and was executed almost ten years ago in a subsoil in which the principal problems were caused by a 6 meters thick loose sand layer, underlaid by a 4 meter thick silty organic clay layer. Several buildings were damaged and had to be repaired. The objective of this paper is to show that even using the incomplete laboratory …
Performance Of A Coal Refuse Embankment, David C. Cowherd, Vlad G. Perlea, Alvin Coulson
Performance Of A Coal Refuse Embankment, David C. Cowherd, Vlad G. Perlea, Alvin Coulson
International Conference on Case Histories in Geotechnical Engineering
Continuous determinations of density, moisture content, and permeability through a 140-foot high coarse refuse embankment impounding slurry were made. The density determinations were made with nuclear moisture-density depth gauges continuously throughout 120-foot depth of the embankment. The permeability tests were made with a special packer permeability device and were conducted throughout the 120-foot depth of the embankment. Compaction density tests were made during compaction of the refuse. Comparisons were made to design, as-compacted, and in-place permeabilities, densities, and phreatic surface within the embankment. The study shows that coarse refuse embankments compacted in roughly 18-inch lifts with a special dozer and …
Prediction And Field Performance Of An Instrumented Road, Robert Brian Smith, William Otho Yandell
Prediction And Field Performance Of An Instrumented Road, Robert Brian Smith, William Otho Yandell
International Conference on Case Histories in Geotechnical Engineering
Performance of a surface-treated crushed rock pavement, 250 mm thick and placed over a weak subgrade, is predicted using mechano-lattice analysis and the results are compared with actual performance after the passage of the equivalent of 800 000 standard axles. Input is in terms of the deformation characteristics determined from repeated loading triaxial testing. Performance is measured in terms of pavement profile, roughness and permanent deformation or rutting. Predicted straight-edge rutting was within the range of values measured in the field. The measured profile index and roughness count were consistent with a pavement showing little deformation over its initial six …
Slope Stability Problems Related To A Semi-Bridge Construction, St. Christoulas, E. Gassios, N. Kalteziotis, G. Tsiambaos
Slope Stability Problems Related To A Semi-Bridge Construction, St. Christoulas, E. Gassios, N. Kalteziotis, G. Tsiambaos
International Conference on Case Histories in Geotechnical Engineering
In the area of "AKTEA", a summer-housing estate 36 Km away from the city of Athens, a great landslide affected the stability of a semi-bridge, constructed in 1980 for the widening of the nearby national road. Preliminary studies carried out before the semi-bridge construction and after the observed damage of most of the houses in the uphill area, favoured the existence of a very superficial creep affecting however the one or two storey buildings of the summer-housing estate. After the semi-bridge construction, instability phenomena continued in an increasing rate and a more systematic geotechnical investigation revealed definite landslide movements (instead …
Tarbela Reservoir A Question Of Induced Seismicity, S. K. Mahdi
Tarbela Reservoir A Question Of Induced Seismicity, S. K. Mahdi
International Conference on Case Histories in Geotechnical Engineering
Tarbela Dam which is by volume (105 million m3) the world's largest earth and rock filled dams is located on the middle Indus River in northern Pakistan. Having a length at crest of 2.7 Km and maximum height 143 m, its reservoir has an area of about 100 Sq. Kms, with a maximum depth of about 130 m and gross capacity of 13.7 Km3. Complete first impounding of reservoir was carried out during 1975 and since then it has completed twelve filling-release cycles. To study the induced seismic behaviour of Tarbela Reservoir data analysis regarding number …
Underseepage Control Measures At Painted Rock Dam, L. Knuppel, F. Mclean, A. Roodsari
Underseepage Control Measures At Painted Rock Dam, L. Knuppel, F. Mclean, A. Roodsari
International Conference on Case Histories in Geotechnical Engineering
Painted Rock Dam, a 181 ft (55.2 m) high, zoned earth embankment detention structure near Gila Bend, Arizona, retained approximately 2.3 million acre ft (2.8 x 109m3) of water for an extended period during the winter of 1978- 1979. Several areas of seepage developed over major portions of the downstream valley and in a minor area on the right abutment. These areas were monitored while instrumentation was installed and investigations made to determine the nature of the seepage and provide the basis for evaluation of structural performance and design of necessary relief and control measures. Construction …
Seismic Response Analysis Of Forebay Structure For Cw Pump House Of A Nuclear Power Project, Malay Basu Ray, Dhiman Kr. Ghosh
Seismic Response Analysis Of Forebay Structure For Cw Pump House Of A Nuclear Power Project, Malay Basu Ray, Dhiman Kr. Ghosh
International Conference on Case Histories in Geotechnical Engineering
The paper reviews the current state-of-the-art on the seismic response analysis of complex RCC structure like forebay which is usually connected with CW Pump House frame at its rear end for fulfilling circulating water requirement in power plant - nuclear or thermal. The need to include in such analysis and design effects of 3-Dimensional mathematical model and soil-structure interaction for studying overall behaviour of the structure are highlighted. The paper also discusses the usefulness, if any, of such rigorous analysis and identifies some problem areas in finalising realistic design data and adopting suitable models to represent the structural system.
Some Experiences From Damages Of Embankments During Strong Earthquakes China, Shen Choggang
Some Experiences From Damages Of Embankments During Strong Earthquakes China, Shen Choggang
International Conference on Case Histories in Geotechnical Engineering
This paper gives a series of case histories of earth dams which have been damaged by strong earthquakes in the past 25 years in China. These damages include slides, cracks, settlements leakages and also some appurtenant structure failures. Experiences show it is necessary to stringently control the design and construction to resist earthquakes.
The Simplified Formulas For Predicting Seismic Liquefaction Of Saturated Clayey Silt Site, Wang Yuqing
The Simplified Formulas For Predicting Seismic Liquefaction Of Saturated Clayey Silt Site, Wang Yuqing
International Conference on Case Histories in Geotechnical Engineering
In the reconstruction of old factories and in the small scale engineering, it is often taken place that the present methods for predicting liquefaction of clayey silt could be not used for lack of subsoil exploration data. Two simplified formulas which contain the coefficient of αPc considering the effect of clay content Pc and the coefficient of αIp considering the effect of plasticity index Ip are presented for predicting seismic liquefaction of saturated clayey silt. Thus, the prediction of liquefaction of clayey silt could be effectively proceeded under the conditions lacking of analysing data of soil grain composition.
Correlation Between The Actual And Predicted Settlements Of Structures At Nsukka, Nigeria, H. O. Chukweze
Correlation Between The Actual And Predicted Settlements Of Structures At Nsukka, Nigeria, H. O. Chukweze
International Conference on Case Histories in Geotechnical Engineering
The paper compares the measured and calculated settlements of two buildings and one concrete water tank founded on the red-weathered soils of Nsukka, Nigeria. Prior to actual construction of the structures the three sites were investigated, soil samples were collected and tested in the laboratory and the data collected were used to predict the total and differential settlements of the structures. Then permanent concrete slabs were established as bases at each of the three sites for observing other points. The theodolite was used at each of the sites to monitor the movements of each of the structures, starting from the …
Design, Construction And Performance Of A Deep Excavation In Soft Clay, Richard Riker, David Dailer
Design, Construction And Performance Of A Deep Excavation In Soft Clay, Richard Riker, David Dailer
International Conference on Case Histories in Geotechnical Engineering
A deep internally braced excavation in soft clay was performed for a pump station at a sewage treatment plant in Milwaukee, Wisconsin. The design was influenced by the limited site area; potential for bearing capacity failure and/or hydrostatic blowout in the bottom of the excavation; and the necessity to limit ground deformation outside the excavation to protect existing structures and utilities. A performance specification and design was prepared by the owner's engineer. The design included minimum earth and hydrostatic lateral loading conditions to be used by the contractor, a minimum depth of penetration for the earth support system, and a …
Drilled Pier Load Test, Fort Collins, Colorado, J. B. Hummert Jr., T. L. Cooling
Drilled Pier Load Test, Fort Collins, Colorado, J. B. Hummert Jr., T. L. Cooling
International Conference on Case Histories in Geotechnical Engineering
A full-scale compressive load test was conducted on a drilled pier in the Pierre Shale Formation near Fort Collins, Colorado, to verify design parameters. The test pier was designed based on presumptive design criteria for both end-bearing and skin friction in the shale. The maximum test load of 6.7 MN (750 tons) resulted in a deflection of approximately 230 mm (9.0 in.). Instrumentation within the pier allowed determination of the actual end-bearing and skin friction values at various applied loads. Based on results of the test, production piers were redesigned for skin friction only and shear rings were added to …
Gbs Platform Evaluation Using Field Instrumentation, Joseph M. Keaveny, Per Magne Aas, Farrokh Nadim
Gbs Platform Evaluation Using Field Instrumentation, Joseph M. Keaveny, Per Magne Aas, Farrokh Nadim
International Conference on Case Histories in Geotechnical Engineering
A case history of the foundation behaviour of an offshore gravity base structure (GBS) is presented. The platform rests on an overconsolidated fissured clay, bounded, top and bottom, by pervious sand layers. Sixteen piezometers have been placed within this 30 m layer. Based on one-dimensional consolidation theory, independent analyses using both settlement and pore pressure measurements indicated a high degree of consolidation had occurred much sooner than was estimated in the initial design phase. These analyses indicated that laboratory oedometer tests underpredicted the coefficient of consolidation by one to two orders of magnitude. Updated settlements and stability analyses yielded 50% …
Pressure Injected Footings – A Case History, M. R. Lewis, M. M. Blendy
Pressure Injected Footings – A Case History, M. R. Lewis, M. M. Blendy
International Conference on Case Histories in Geotechnical Engineering
A specialty contractor installed high-capacity pressure-injected footings (PIFs) for foundations in a congested area of an existing coal-fired power plant. Some concrete cylinders broke at strengths significantly lower than the minimum specified strength. Initial coring of some of the PIFs uncovered voids and deleterious matter at the junction of the shaft and the end-bearing base of the PIFs. Subsequent load tests and additional coring substantiated the load-transfer problem. A field testing program was initiated to verify the load-carrying capacity of all the completed PIFs. Wave equation analyses optimized the testing program, established the field testing criteria, and predicted ultimate capacities …
Axial Load Capacities Of Steel Pipe Piles In Sand, Roy E. Olson, Khalil Al-Shafei
Axial Load Capacities Of Steel Pipe Piles In Sand, Roy E. Olson, Khalil Al-Shafei
International Conference on Case Histories in Geotechnical Engineering
The 1986 API method was used to predict the capacities of steel pipe piles, in predominantly cohesionless soils, for thirty three axial load tests. The ratio of calculated to measured capacities (QC/QM) was found to range from 0.15 to 3.0 with a mean QC/QM of 0.74. Reconsideration of the soil properties in terms of standard penetration resistances, made it possible to reduce the scatter to the range of 0.65 to 1.23 with a mean value of 0.93. The large errors previously existing for short piles were eliminated. Analyses were equally accurate for piles in compression and tension. The factor of …
Design And Monitoring Of Earth Embankments Over Permafrost, S. Dufour, A. S. Judge, P. Lafleche
Design And Monitoring Of Earth Embankments Over Permafrost, S. Dufour, A. S. Judge, P. Lafleche
International Conference on Case Histories in Geotechnical Engineering
As the northern regions of Canada are developed, there is an increasing need to protect the fragile ecology as well as to maximize usage of local construction materials. The construction of earth dykes to retain liquid wastes is a common requirement in municipal and industrial developments. Frozen core earthfill dykes provide an effective technique to cut off seepage in cold permafrost areas (Sayles, 1984). The seepage of water through an unfrozen overburden or fractured bedrock foundation can occur and accelerate the thermal deterioration of an earth embankment. The development of the active layer during the summer reduces the dam's ability …
Foundations On Stone Columns Resting On Coralline Limestone, K. S. A. Rahim, A. W. Dhowian
Foundations On Stone Columns Resting On Coralline Limestone, K. S. A. Rahim, A. W. Dhowian
International Conference on Case Histories in Geotechnical Engineering
The subsoil conditions along the Red Sea coast in Saudi Arabia are complex due to existence of very thick beds of coralline limestone of recent geological origin. These coral beds are soft, porous and nonhomogeneous. They are often interspaced with large cavities and soft sandwiched layers of finer particles. Analysis of the subsoil conditions to a fifty meter depth based on data from deep boreholes, Standard Penetration Tests (SPT), Quasi Static Cone Tests (DCT) and large size Plate Load Tests is presented. The strength and compressibility characteristics of the strata and the correlation factors for the SPT and DCT in …
Performance Of Prefabricated Drains In Soft Soils, R. David Charles
Performance Of Prefabricated Drains In Soft Soils, R. David Charles
International Conference on Case Histories in Geotechnical Engineering
The use of vertical drains to accelerate the consolidation of soft soils has become a cost effective alternative to the use of pile foundations at many sites. This paper presents a case history of the use of vertical drains to accelerate the consolidation of 20 to 25 feet of low shear strength, highly compressible soils, under embankments of 12 to 25 feet in height. Two separate vertical drain installations at the project site allowed the use of a shallow foundation system for approximately one-half of the foundations. This resulted in a significant savings in foundation costs and allowed an ambitious …
Vertical Excavation Below Footing Solved By Compaction Grouting, Harry Grice, Ernest T. Mosley, Richard M. Berry
Vertical Excavation Below Footing Solved By Compaction Grouting, Harry Grice, Ernest T. Mosley, Richard M. Berry
International Conference on Case Histories in Geotechnical Engineering
One of the problems regularly facing engineers in designing additions to buildings or other structures is dealing with excavating for footings directly adjoining existing footings but at a deeper level. This was accomplished in sandy soils economically and quickly for a noted Conference Center in 1983 by using compaction grouting. Compaction piles were utilized to pick up existing loads as well as the horizontal loads which would normally allow the building to tip, settle and crack. We believe this was the first use of compaction piles as "anchor" piles to pick up horizontal loads. By using this process, the sandy …
Program Of The Conference, Multiple Participants
Program Of The Conference, Multiple Participants
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984): Vol. Iii, Multiple Authors
Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984): Vol. Iii, Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984): Vol. Ii, Multiple Authors
Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984): Vol. Ii, Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
A Study Of Contamination Migration At A Hazardous Waste Facility In Louisiana, George H. Cramer Ii
A Study Of Contamination Migration At A Hazardous Waste Facility In Louisiana, George H. Cramer Ii
International Conference on Case Histories in Geotechnical Engineering
Traditionally clay soils have been regarded as being relatively impermeable to the migration of water and contaminants. Recent studies in Louisiana are beginning to show, however, that laboratory permeability tests are not true indicators of the ability of an in-situ soil to retain or transmit fluids. Both the depositional and post-depositional environment of a soil can greatly alter its in-situ permeability. In particular, post-depositional structural fractures provide preferential pathways for contaminant migration at rates that far exceed those predicted by using laboratory permeability values. Difficulties in field identification of these pathways reduces modeling of their effect on site hydrology to …
Design And Construction Of A Soil Bentonite Slurry Wall Around An Operating Facility Superfund Site, A. S. Burgess, G. S. Laird, M. S. Leonard
Design And Construction Of A Soil Bentonite Slurry Wall Around An Operating Facility Superfund Site, A. S. Burgess, G. S. Laird, M. S. Leonard
International Conference on Case Histories in Geotechnical Engineering
A soil bentonite slurry wall was designed for an NPL site to stop further migration of chemicals in a complex aquifer system, and to facilitate the removal of possible chemical sources from saturated zones beneath the site. Pumping from within the slurry wall will maintain inward and upward hydraulic gradients and thus stop further lateral or vertical migration of chemicals from the contained area. The slurry wall was constructed under an exceptionally detailed Quality Assurance; Quality Control review by the Contractor and two independent consulting firms. Ground movements, vibration levels and opacity of dust produced during construction were monitored for …
Failure And Reconstruction Of A Waste Containment Pond Slope, Dorairaja Raghu, Robert J. Van Orden
Failure And Reconstruction Of A Waste Containment Pond Slope, Dorairaja Raghu, Robert J. Van Orden
International Conference on Case Histories in Geotechnical Engineering
A portion of a slope of a subsurface waste containment cell failed. It is believed that this failure could be attributed to a sudden drawdown condition caused by the pumping of treated wastewater effluent stored inside the cell prior to construction of the permanent liner. This conclusion seems to be in agreement with the results of a stability analysis conducted utilizing post-failure slope profile data. A discussion of the analysis of the failure and the reconstruction of the slope is presented in this paper.
Evaluation Of Remedial In-Waste Leachate Head Reduction, Denise E. Mills, Donald A. Cordell
Evaluation Of Remedial In-Waste Leachate Head Reduction, Denise E. Mills, Donald A. Cordell
International Conference on Case Histories in Geotechnical Engineering
Water quality monitoring at Cedar Hil.ls Regional Landfill, in King County, Washington has indicated that shallow ground water perched in lodgement till has been impacted by solid waste disposal. A leachate mound to 50 feet in thickness was identified in the refuse which overlies the low permeability till. The leachate head over the till is sufficient to cause downward flow of leachate through the till to shallow ground water, and may contribute to water quality impacts at the site. Lowering the leachate head, therefore, may reduce the potential for impacts on water quality. A study was conducted to obtain estimates …
Geotechnical And Groundwater Site Characterization On The Umtra Project, J. A. Caldwell, R. A. Rager, L. Coons
Geotechnical And Groundwater Site Characterization On The Umtra Project, J. A. Caldwell, R. A. Rager, L. Coons
International Conference on Case Histories in Geotechnical Engineering
Reclamation of 24 inactive uranium mill tailngs piles involves remedial work to stabilize the piles for 1000 years. Site characterization of geotechnical and groundwater conditions at each site is undertaken prior to remedial action design. This paper describes the approach to UMTRA Project site characterization. A case history, Green River, is described. Details of site characterization costs for most sites are provided.
Use Of Deeply Weathered Rock As Landfill Cover Material, Patacon Landfill, Republic Of Panama, W. C. B. Gates
Use Of Deeply Weathered Rock As Landfill Cover Material, Patacon Landfill, Republic Of Panama, W. C. B. Gates
International Conference on Case Histories in Geotechnical Engineering
Under normal conditions weathered rock provides poor landfill cover because of its permeable nature. However, a recent hydrogeological investigation conducted by the US Army Environmental Hygiene Agency (AEHA) of the Patacon Landfill in the Republic of Panama revealed the contrary. The operators were using weathered rock from the surrounding saprolitic outcrops of the Panama formation and Tertiary andesite intrusions for landfill cover. The AEHA selected samples of the weathered rock from the borrow sites for engineering tests at their soils engineering lab at Aberdeen Proving Ground, Maryland. The following are test results. Water induces the weathered rock to slake very …