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Articles 15391 - 15420 of 21740
Full-Text Articles in Engineering
General Report Session No. 1: Case Histories Of Foundations, Roy E. Olson, J. H. Long, R. Jardine, Yudhbir
General Report Session No. 1: Case Histories Of Foundations, Roy E. Olson, J. H. Long, R. Jardine, Yudhbir
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Past Proceedings: Third International Conference On Case Histories In Geotechnical Engineering, St. Louis (1993), Multiple Authors
Past Proceedings: Third International Conference On Case Histories In Geotechnical Engineering, St. Louis (1993), Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Concluding Session, Y. Iwasaki
Concluding Session, Y. Iwasaki
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Past Proceedings: Second International Conference On Case Histories In Geotechnical Engineering (1988), Multiple Authors
Past Proceedings: Second International Conference On Case Histories In Geotechnical Engineering (1988), 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. 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.
Prediction And Observation Of Pore Pressure Due To Pile Driving, S. Chandra, Md. I. Hossain
Prediction And Observation Of Pore Pressure Due To Pile Driving, S. Chandra, Md. I. Hossain
International Conference on Case Histories in Geotechnical Engineering
In this study, pore pressure response due to pile driving has been observed in the field. Cavity Expansion theory using critical state parameters of the soil has been used to predict the trend of the pore pressure development and dissipation. Parametric study has been carried out to know the sensitivity of various parameters on the predicted results. A comparison has been made between the predicted and observed results.
Variation In Capacities Of Different Pile Types Under Similar Soil Conditions, H. Senapathy, J. R. Davie, M. R. Lewis
Variation In Capacities Of Different Pile Types Under Similar Soil Conditions, H. Senapathy, J. R. Davie, M. R. Lewis
International Conference on Case Histories in Geotechnical Engineering
The interaction between soil and various pile types is of interest because it depends not only on the shear strength characteristics of the soil, but also on the pile dimensions, shape, and installation method, and on time after pile installation. This paper presents load test results from three types of displacement piles installed at the same site. The results obtained from the tests are compared with theoretical estimates. The computed values of soil-pile adhesion, back-calculated from the load tests, are discussed and compared with values found in the literature. Estimated pile capacities during driving and retap are also compared and …
General Report Session No. 2: Case Histories Of Slopes, Dams And Embankments, Leslie F. Harder Jr., Vlad G. Perlea, Nario Yasuda
General Report Session No. 2: Case Histories Of Slopes, Dams And Embankments, Leslie F. Harder Jr., Vlad G. Perlea, Nario Yasuda
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Dynamics Of Rockfalls In Sri Lanka And Landslide Hazards, R. K. Bhandari, K. Jeyatharan, A. Raviskanthan
Dynamics Of Rockfalls In Sri Lanka And Landslide Hazards, R. K. Bhandari, K. Jeyatharan, A. Raviskanthan
International Conference on Case Histories in Geotechnical Engineering
The paper spotlights the dynamics of rockfalls and debrisflows in Sri Lanka in the backdrop of some recent examples and discusses the appropriateness of simple energy dissipation systems in situations where source of rockfall is either intractable or difficult to arrest. The question of runout of rockfalls usually significant in the assessment of their damage potential is also discussed and importance of such estimate is highlighted in the context of landslide hazard zonation mapping.
Evaluation And Remediation Of A Small Landslide In Colluvium, D. T. Mooney, J. J. Bowdes Jr.
Evaluation And Remediation Of A Small Landslide In Colluvium, D. T. Mooney, J. J. Bowdes Jr.
International Conference on Case Histories in Geotechnical Engineering
A landslide in colluvium near Grafton, West Virginia was evaluated for cause and remediation. Monitoring was conducted for 15 months to observe further movements prior to remediation. The observed failure surface, slide geometry and groundwater conditions were used to back-solution for an effective residual friction angle ( φr’) . The φr’ was found to agree well with index property correlations cited in the literature. Slope failure resulted from excessive pore water pressures due to seasonably high groundwater levels. Stability analyses using the back-solutioned φr’ were performed to design and position seepage cutoff drains for …
Large Scale Instrumental Test Embankment On Uranium Tailings, J. L. Santiago, T. Barrera, M. Pastor
Large Scale Instrumental Test Embankment On Uranium Tailings, J. L. Santiago, T. Barrera, M. Pastor
International Conference on Case Histories in Geotechnical Engineering
The remediation of an inactive uranium mill tailings pile at the town of Andujar (Spain) has provided an opportunity to investigate the settlement characteristics of hydraulically-deposited uranium mill tailings. A test embankment was constructed on top of the existing tailings deposit and total stresses, settlements and pore pressures were measured. Settlements and pore pressure data were compared with the results obtained using an elastoplastic numerical model which allows the simulation of two dimensional consolidation processes. Backcalculated consolidation parameters were derived to provide agreement between the calculated and measured settlements and pore pressures. These parameters could then be used to predict …
Stabilization Of A Tailings Dam By De-Watering, A. B. Fourie, G. I. Mcphail
Stabilization Of A Tailings Dam By De-Watering, A. B. Fourie, G. I. Mcphail
International Conference on Case Histories in Geotechnical Engineering
The failure of the outer slope of one of the paddocks of a tailings dam, resulted in a significant decrease in the area available for tailings deposition. Overloading of the remaining five paddocks resulted. To maintain the stability of the existing dam whilst construction of new disposal facilities was in progress, three techniques were investigated; horizontal, push-in drains at the dam toe, a rock buttress around the operational paddocks, and vertical de-watering wells installed on the first terrace, or ‘step-back’ of the dam. De-watering wells proved most effective, and 165 wells were installed. A monitoring programme included regular determination of …
Moisture And Mineralogy Aspect Of Clayey Materials, Sanga Tangchawal
Moisture And Mineralogy Aspect Of Clayey Materials, Sanga Tangchawal
International Conference on Case Histories in Geotechnical Engineering
Problems of clayey mass stability are mainly due to swelling behavior and strength reduction of clayey soils and rocks. Laboratory measurements were carried out on various clayey materials to obtain their engineering properties related with the performance of clays in nature. The author demonstrated statistical relationships among material index and material properties. Review of geotechnical mechanisms concerning moisture and mineralogy effects was also given.
Consolidation Study Of An Active Tailings Pond, B. F. Ulrich
Consolidation Study Of An Active Tailings Pond, B. F. Ulrich
International Conference on Case Histories in Geotechnical Engineering
Two geotechnical site investigations using state-of-the-art equipment for insitu testing have been made of a single tailing pond. The two separate investigations were made at an interval of approximately three years between studies. Each investigation included such tests as piezocone, self-boring pressuremeter, field vane shear, and standard penetration tests. The purpose of these tests was to establish various strength and phreatic characteristics of the tails in the deposit for use as input design parameters in the proposed upstream embankment expansion. This data may also be used to show a time-based consolidation study of a fully-drained, active tailing deposit. As tests …
Comparison Between Finite Element Predictions And Results From Dynamic Centrifuge Tests On Tilting Gravity Wall Retaining Dry Sand, A. S. Al-Homoud, R. V. Whitman
Comparison Between Finite Element Predictions And Results From Dynamic Centrifuge Tests On Tilting Gravity Wall Retaining Dry Sand, A. S. Al-Homoud, R. V. Whitman
International Conference on Case Histories in Geotechnical Engineering
An analytical model is developed to analyze the seismic response of gravity walls retaining and founded on dry sand, with special emphasis on tilting behavior. A well verified two-dimensional finite element code is used for this purpose. The analytical model is verified comparing predictions to results from three dynamic centrifuge tests, with satisfactory agreement. Moreover, sensitivity analyses are carried out for one of the centrifuge test conditions to understand how the results would change if the boundary conditions and rotational stiffness of the wall were changed.
Earthquake Damage To Fill Dams, S. Tani
Earthquake Damage To Fill Dams, S. Tani
International Conference on Case Histories in Geotechnical Engineering
Earthquakes have caused much damage to fill type dams. Research into earthquake damage has contributed to the study of earthquake resistance of dams. However damage to fill dams occurred almost only to small scale earth dams, especially the few cases of heavy damage. This report describes the damage and performance of fill dams more than 15m-high during earthquakes, drawn from literature, data, and field surveys. The results indicate that even stronger earthquakes than the design earthquake intensity did not cause heavy damage to large well-constructed modern dams. The above analysis of the performance of fill dams during earthquakes shows that …
Mitigation Of Seismically Induced Slope Movement, Craig S. Shields, Frank L. Rollo
Mitigation Of Seismically Induced Slope Movement, Craig S. Shields, Frank L. Rollo
International Conference on Case Histories in Geotechnical Engineering
Ground shaking during the Lorna Prieta earthquake of 17 October 1989 caused permanent lateral and vertical displacements of a steep hillside in San Francisco, California. These displacements damaged 36 residences along the top of the hillside. Subsequent exploration and analyses indicated the hillside is composed of loose to medium-dense Dune sand that is marginally stable under static conditions, but highly susceptible to ·movements during ground shaking caused by earthquakes. A retaining system consisting of a combination of drilled soldier piles and permanent tiebacks was designed and constructed to mitigate the potential for future seismically induced slope movement. This paper describes …
Investigation Of Traffic Induced Ground Vibration By Random Process Theory, J. Benčat
Investigation Of Traffic Induced Ground Vibration By Random Process Theory, J. Benčat
International Conference on Case Histories in Geotechnical Engineering
The ground motion is caused by vibration propagation due to moving vehicles. Ground vibration recorded at a distance from a busy roadway or railway is analyzed assuming it to be a random and statistically stationary function of time. The soil media are characterized as the visco- elastic halfspace. The analytical method for predicting ground vibration has been described. The spectral density of ground vibration for a particular case was calculated and the prediction is validated by experimental measurement.
Analysis Of Fatal Accidents Caused By Trench Failure, Yasuo Toyosawa, Noriyuki Horii, Satoshi Tamate
Analysis Of Fatal Accidents Caused By Trench Failure, Yasuo Toyosawa, Noriyuki Horii, Satoshi Tamate
International Conference on Case Histories in Geotechnical Engineering
The purpose of this paper is to clarify the failure mechanism and how workers died due to trench failures with close examination of the situations surrounding these accidents. We carried out a statistical analysis of various factors obtained from fatal accident data which were reported by the Labour Standard Office to the Ministry of Labour. This examination revealed some important characteristics of fatal accidents due to trench failures.
Predictions Of The Behavior Of A Deep Braced Excavation, Jeen-Shang Lin, J. G. Deng
Predictions Of The Behavior Of A Deep Braced Excavation, Jeen-Shang Lin, J. G. Deng
International Conference on Case Histories in Geotechnical Engineering
This paper describes in detail a prediction about the responses of the soil and the RC diaphragm wall of a deep excavation in Taipei. The 21.8 m excavation was the deepest at the time, and it served as a good basis for testing previous back analysis results. As instrumentation records became available, updates were made and were passed to the contractor for the construction control purpose. The prediction was considered as a success.
Pressure Relief Tunnel System At Us22/Sr7 Interchange, Oh, J. R. Graham, R. W. Humphries, J. M. Fuller, G. M. Elliott
Pressure Relief Tunnel System At Us22/Sr7 Interchange, Oh, J. R. Graham, R. W. Humphries, J. M. Fuller, G. M. Elliott
International Conference on Case Histories in Geotechnical Engineering
Construction of the US22/SR7 interchange in Steubenville, OH resulted in the need to excavate the toe of the steep 350 ft. high slope overlooking the Ohio River. To maintain the stability of the slope, the Ohio Department of Transportation (ODOT) chose to construct a 4 tier, 130- ft. high, 2,200 ft. long tieback anchor retaining wall. During the design phase, it became apparent that reductions in both the tieback loading and cost could be realized by lowering the groundwater levels in the hillside. A Pressure Relief Tunnel System (PRTS) was selected from several drainage options. The PRTS consists of a …
Studies On A 4.0m High Reinforced Earth Wall, Swami Saran, I. N. Khan
Studies On A 4.0m High Reinforced Earth Wall, Swami Saran, I. N. Khan
International Conference on Case Histories in Geotechnical Engineering
In this paper studies carried out on an instrumented 4. 0 m high reinforced earth wall have been described. The shape of potential failure surface was found bi-linear. Stability analysis based on computation using classical Renkine's theory was found applicable.
Cavern Wall Support Requirements In A Hydro-Electric Project, Manoj Verman, J. L. Jethwa, R. K. Goel
Cavern Wall Support Requirements In A Hydro-Electric Project, Manoj Verman, J. L. Jethwa, R. K. Goel
International Conference on Case Histories in Geotechnical Engineering
Construction of a 23m wide, 57m high, and 210m long underground power house cavern is in progress as a part of the multi-purpose Sardar Sarovar Project in India. The rock mass around the cavern is basalt which is intruded by a number of dolerite dykes. In view of the high side walls of the cavern, and the presence of a 1 to 2m thick shear zone running across the cavern width, a comprehensive approach was worked out for estimation of the wall support requirements. The approach included estimation of the roof support requirements using the four available approaches, and comparison …
Impact Of Environmental Conditions On A Structural Damage, M. A. El-Sohby, M. A. Bahr
Impact Of Environmental Conditions On A Structural Damage, M. A. El-Sohby, M. A. Bahr
International Conference on Case Histories in Geotechnical Engineering
This paper deals with a case history of a structural damage of college buildings lie in a nearly developed area at the north-east of Cairo. The building behavior and the factors cause the damage arc contributed. As a result, the light on the importance of topographical condition of the site is sighted and recommended for such similar cases.
Preloading Wastewater Treatment Plant Tanks, K. Lowery, A. N. Wagh, J. B. Falcon
Preloading Wastewater Treatment Plant Tanks, K. Lowery, A. N. Wagh, J. B. Falcon
International Conference on Case Histories in Geotechnical Engineering
Storage tanks for a wastewater treatment plant were stage-loaded on weak compressible fine-grained soils. The in situ silt and sand layers/pockets present in the fine-grained soils were theorized to create sufficient drainage paths, so that the use of sand or wick drains were not required. Although the silt and sand layers/pockets were found to be discontinuous, "hydraulic fracturing" was expected to develop continuous drainage paths. A review of the extensive field investigation and geotechnical optimization of the site is presented. Details for the evaluation of the shear strength of the soils, the stage loading schedule and predicted settlements during loading …
Surcharging Of Organic Silt Using Prefabricated Vertical Drains, T. H. Bedenis
Surcharging Of Organic Silt Using Prefabricated Vertical Drains, T. H. Bedenis
International Conference on Case Histories in Geotechnical Engineering
A new Combined Sewage Overflow (CSO) basin was constructed in Saginaw, Michigan. The project required an 8.5 foot (2.6 m) diameter connecting sewer to be constructed under a 12 foot (3.7 m) high stockpile of spoil from the excavation for basin. The soil profile at the site contained a 32 foot (9 .8 m) thick layer of compressible organic silt. Since the weight of the stockpile was anticipated to cause settlement of the sewer, a surcharge was placed to preconsolidate the organic silt prior to construction of the sewer. Analysis indicated prefabricated vertical (PV) drains would be required to achieve …
Foundation Soil Preparation For Landfills In Karst Terrain, Kou-Roung Chang, John Carter
Foundation Soil Preparation For Landfills In Karst Terrain, Kou-Roung Chang, John Carter
International Conference on Case Histories in Geotechnical Engineering
Stabilizing sand-filled solution chimneys in karst terrain for the construction of sanitary landfills is challenging for geotechnical engineers. A ground water contamination assessment conducted at a sanitary landfill in north central Florida indicated that landfill leachate was contaminating the Floridian Aquifer. To expand the landfill, the Florida Department of Environmental Regulation (FDER) required that a liner system be constructed and that stringent landfill subgrade preparation be performed to minimize the potential for sinkhole formation and subsequent damage to the liner system. To meet the requirements, the following foundation soil preparations were performed: (1) prerolling the subgrade with vibratory rollers, (2) …
Instrumented Caissons At The Ibm Building, Baltimore, S. Kesavanathan, D. W. Kozera
Instrumented Caissons At The Ibm Building, Baltimore, S. Kesavanathan, D. W. Kozera
International Conference on Case Histories in Geotechnical Engineering
Two of the caissons supporting the 26-story IBM office building were instrumented to evaluate the load transfer mechanism from caissons to the surrounding soil and rock. These drilled shafts extended through loose alluvial stratum, a stratum of dense sands and silts, a disintegrated rock stratum, and were founded in the underlying Amphibolite bedrock. Evaluation of mobilized skin friction and end bearing for one of the caissons are presented in this study. Instrumentation consisted of vibrating wire total load cells and embedded strain gauges. Total load cells were installed at the bottom of the caissons to measure the end bearing pressure. …
Behavior Of Direct Tower Foundation On Improved Soil, F. Colleselli, P. Varagnolo
Behavior Of Direct Tower Foundation On Improved Soil, F. Colleselli, P. Varagnolo
International Conference on Case Histories in Geotechnical Engineering
The paper presents the foundation behaviour of a 146-m telecommunications tower situated near Verona in Italy, with foundation soils characterized as a thick deposit of alluvial gravels and sands. In order to limit total and differential settlements of the tower it was decided to improve the foundation soil with jet-grouting columns. Predictions on the behaviour of the structure and the foundation soil were performed with an axisymmetric finite-element model adopting an elastic linear constitutive law. Soil moduli were obtained from the results of a cross-hole test and from Standard Penetration Tests; jet-grouting columns behaviour was estimated from load and borehole …
Structural And Functional Distress Due To Slag Expansion, E. M. Morales
Structural And Functional Distress Due To Slag Expansion, E. M. Morales
International Conference on Case Histories in Geotechnical Engineering
Cracking and heaving of a Single Storey R.C. Building was initially perceived as settlement. This error led to unnecessary and costly remedial measures such as Piling for the Phase ll Building which further aggravated the problem. The heaving was caused by a seemingly innocent decision during the construction stage to use Slag from a steel mill as the base course material. This Slag reacted with the highly corrosive groundwater which caused heaving of the Building and discomfort and morale problems to the Building occupants. Careful engineering study and investigation resulted in a very simple solution which saved the Building from …