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Full-Text Articles in Geotechnical Engineering
Construction Of A Double Tunnel With Ground Windows, Helmut Meissner, Günter Borm
Construction Of A Double Tunnel With Ground Windows, Helmut Meissner, Günter Borm
International Conference on Case Histories in Geotechnical Engineering
A double tunnel of 6.3 m height has been driven in loess underground of low friction and relatively large capillary cohesion. To attain a tunnel climate corresponding to natural underground conditions, earth windows were provided along the side walls of the tunnel. The portal was supported by steel profiles, anchors and a shotcrete layer. The stability of the retaining construction was ensured by two independent methods. A preexcavation of the tunnel was found to be necessary. The works were performed simultaneously with excavation of the hillside facing the portal. The tunnel lining consists of reinforced shotcrete. The bearing behaviour of …
Deformation Behavior Of Wilford Hall Hospital Mat, Lawrence D. Johnson
Deformation Behavior Of Wilford Hall Hospital Mat, Lawrence D. Johnson
International Conference on Case Histories in Geotechnical Engineering
The vertical deformation behavior of the 3.5-ft thick mat supporting an 11-story addition to the Wilford Hall Hospital complex near San Antonio, Texas was investigated to determine the mode of deformation and to develop a procedure for estimating the effective stiffness of the foundation soil. The observed distortion pattern is dish-shaped and consistent with that of a plate on a semi-infinite elastic foundation. Measured displacements are consistent with displacements calculated by a plate on elastic foundation finite element program using effective elastic soil moduli between 2,943 and 4,000 kips /square foot and poisson's ratio 0.3. An equation was derived for …
Demonstrating Borehole Drilling Accuracy At The Navajo Dam, Stephen J. Kravits, Hunter C. Harrel
Demonstrating Borehole Drilling Accuracy At The Navajo Dam, Stephen J. Kravits, Hunter C. Harrel
International Conference on Case Histories in Geotechnical Engineering
The U.S. Bureau of Mines recently demonstrated the accurate directional drilling of a near-horizontal borehole with the objective of intercepting a designated target. The project was conducted at the Navajo Dam for the Bureau of Reclamation, U.S. Department of the Interior. The Bureau of Reclamation's objective was to determine the feasibility of accurately drilling long near-horizontal boreholes, from the surface, in lieu of constructing a tunnel under an embankment dam from which shorter boreholes would be accurately drilled to control water seepage. As a result of the demonstrated drilling accuracy, the Bureau of Reclamation can consider the option of using …
Distribution Of Contact Pressure And Stresses Under Skirted Footings, M. L. Ohri, A. Singh, G. R. Chowdhary
Distribution Of Contact Pressure And Stresses Under Skirted Footings, M. L. Ohri, A. Singh, G. R. Chowdhary
International Conference on Case Histories in Geotechnical Engineering
Skirted footings posses many novel characteristics which render them eminently suitable for construction of structures in situations involving heavy loads and poor soil conditions with promise of economy. The results of the present investigations will help considerably to understand a detailed picture of the complex phenomenon of contact pressure distribution and vertical stress distribution in soil under skirted footings.
Drainage Walling As Excavation Support, Bernhard Wietek
Drainage Walling As Excavation Support, Bernhard Wietek
International Conference on Case Histories in Geotechnical Engineering
In practice there are different processes which are used to support excavations and to maintain the groundwater level in excavations which go down to this level. In urban areas the diaphragm wall is frequently used to protect the excavation and as underground water packing against groundwater flowing in from the side. In addition, the lowering of groundwater is necessary using a well point within the excavation. A new foundation trench sheeting has been developed by the author of this paper. This new method is an improvement on the diaphragm wall by which not only is the earth shored up, but …
Dynamic Compaction – An Unusual Application, Byongmu Song, Michel Gambin
Dynamic Compaction – An Unusual Application, Byongmu Song, Michel Gambin
International Conference on Case Histories in Geotechnical Engineering
The site for the U.S. Air Force 750-bed medical contingency complex which is located approximately 10 miles west of Pusan, Korea is geotechnically adverse. Approximately 30 feet of saturated loose fine sand overlies about 180 feet of Pleistocene fluvial and marine sediments. The upper 90 feet of Pleistocene sediments are in a state of under-consolidation, and moisture contents are generally higher than the liquid limits with SPT N values of about three. 30 feet of loose sand was densified by dynamic compaction and the test results indicated that foundation performance satisfied the contract specifications. A considerable economy, in both cost …
Effectiveness Of Sand Drains In Peaty Soil In A Case Of Differential Settlement Recovering, C. Mastrantuono, A. Tomiolo, E. Arcangeli
Effectiveness Of Sand Drains In Peaty Soil In A Case Of Differential Settlement Recovering, C. Mastrantuono, A. Tomiolo, E. Arcangeli
International Conference on Case Histories in Geotechnical Engineering
The result obtained in a case history of differential settlement recovery are reported. The effectiveness of sand drains in peaty soil is questioned. The importance and the mutual influence of the primary and secondary settlement are discussed. Remarks are made on the value of secondary settlement coefficient.
Effects Of Collapse Settlement Of Fill On Reinforced Earth Walls, G. E. Blight
Effects Of Collapse Settlement Of Fill On Reinforced Earth Walls, G. E. Blight
International Conference on Case Histories in Geotechnical Engineering
Two case histories illustrate the effects that collapse settlement of the fill forming a Reinforced Earth wall can have on the structure. Pre-requisites for collapse settlement are inadequate compaction, compaction at too low a water content, or a combination of these. Collapse settlement occurs subsequently when the water content of the fill is increased by infiltration. The effects of collapse settlement identified in this paper are: (i) a temporary release of friction on the reinforcing strips with the result that the wall facing moves outwards; and (ii) relative settlement between the fill and the wall facing with the result that …
Epoxy Resin Grout System For Solutions To Traditional Geotechnical Problems, A. V. Shroff, D. P. Amin, D. L. Shah
Epoxy Resin Grout System For Solutions To Traditional Geotechnical Problems, A. V. Shroff, D. P. Amin, D. L. Shah
International Conference on Case Histories in Geotechnical Engineering
Use of chemicals for foundation treatment and sealing of crack is of recent origin. The aim of this paper is to find time-viscosity and time-strength relationships of epoxy grout system for proper flow mechanism and strength interaction with rock collected from dam sites of India. The bonding mechanism of gel in the injected mass is explained with the help of Scanning electron microscopy and Infra-red spectroscopy. After trial field grouting the stratascopy has revealed better bonds of moist surface with flexibility to accommodate movement before bond or shear failure occurred and had lower volumetric shrinkage during curing.
Evaluation Of The Effect Of Saturated Silty And Fine Sand Foundation Improved By Vibro-Flotation In Seismic Area, Wang Yuqing, Zhang Weiquan, Qiao Taiping
Evaluation Of The Effect Of Saturated Silty And Fine Sand Foundation Improved By Vibro-Flotation In Seismic Area, Wang Yuqing, Zhang Weiquan, Qiao Taiping
International Conference on Case Histories in Geotechnical Engineering
The improvement of liquefaction foundations in seismic region has been concerning many engineers. The authors had carried out experimental studies on the improvement of saturated silty and fine sand foundations at the suburbs of Beijing by vibroflotation method. The test results are described and the improvement effects are evaluated in this paper.
Experience In Ground Improvement By Dynamic Compaction And Preloading At Half Moon Bay – Saudi Arabia, N. Ghosh, M. M. Tabba
Experience In Ground Improvement By Dynamic Compaction And Preloading At Half Moon Bay – Saudi Arabia, N. Ghosh, M. M. Tabba
International Conference on Case Histories in Geotechnical Engineering
Ground improvement techniques were used to meet the design requirements for a beach resort complex at Half Moon Bay on the Arabian Gulf. Extensive site exploration revealed upper layers consisting of loose to medium fine sand, having variable silt content. The original specification called for filling and ground improvement using Dynamic Compaction to achieve 100kN/m2 surface bearing capacity and 50% relative density at a depth of 10m. Dynamic Compaction (DC) and subsequent field testing, using full scale loading tests as well as CPT and SPT tests, proved that it was possible to achieve these requirements over most areas using …
Field Measurement On A Slope Cutting With Tensile Inclusions, Tamotsu Matsui, Ka Ching San, Terumasa Amano, Yoshinori Otani
Field Measurement On A Slope Cutting With Tensile Inclusions, Tamotsu Matsui, Ka Ching San, Terumasa Amano, Yoshinori Otani
International Conference on Case Histories in Geotechnical Engineering
In a road widening project, tensile inclusions were used to stabilize some parts of cut slope works. The site condition and the construction of reinforced slope cutting are presented. A full scale field test on a reinforced cut slope was performed being incorporated with this road widening project. The field test consisted of a field loading test and a field excavation test. Details of the field test, field measurements and site observation are presented. Finite element analysis of the field test is performed. Based on the field measurements together with the analytical results, the reinforcement mechanism of a reinforced cut …
Oversteepened Slopes Reinforced With Tensar Geogrid, James E. Laier, Robert M. Mattox
Oversteepened Slopes Reinforced With Tensar Geogrid, James E. Laier, Robert M. Mattox
International Conference on Case Histories in Geotechnical Engineering
This paper describes geotechnical design concepts used in developing 45-degree and 56-degree embankment slopes to meet strict stability criteria. Typical design sections are presented along with example stability computations to illustrate factors of safety developed under static and rapid drawdown conditions. This paper also discusses pertinent, site specific aspects of construction considered germane to successful, long term performance of oversteepened slopes at this site.
Performance Of Lpg Storage Tanks On Ground Improved By Stone Columns, E. R. Farrell, T. L. L. Orr, T. O'Donovan
Performance Of Lpg Storage Tanks On Ground Improved By Stone Columns, E. R. Farrell, T. L. L. Orr, T. O'Donovan
International Conference on Case Histories in Geotechnical Engineering
This paper describes the construction of four large tanks on poor soil conditions consisting of hydraulic fill placed over estuarine silt in Dublin port. The limited differential settlement that could be tolerated by the tanks required that they could not be placed on the existing ground. The optimum solution was found to be ground treatment using vibro-replacement with the formation of stone columns and compaction of the fill. The paper describes the design method used and the control tests. The predicted settlements are compared with settlement readings of the tanks following construction. These show that the chosen solution has performed …
Progress In The Use Of Natm For The São Paulo Subway, T. B. Celestino, O. A. Ferrari, C. T. Mitsuse, L. C. Domingues
Progress In The Use Of Natm For The São Paulo Subway, T. B. Celestino, O. A. Ferrari, C. T. Mitsuse, L. C. Domingues
International Conference on Case Histories in Geotechnical Engineering
The first time that the New Austrian Tunnelling Method (NATM) was used for underground works in the Sao Paulo Subway was in 1981. Since that time, significant progress has been achieved in successfully optimizing the support and lowering the construction costs. This paper will describe the latest experience of two single-track parallel tunnels excavated in 1986 through tertiary stiff clay. All the experience accumulated in previous jobs led to design improvements, such as (1) no steel ribs for support along 72% of the tunnels length (2) no temporary invert, and (3) no spiles, forepoles, soil grouting or any other type …
Reinforced Soil In The Repair Of Embankment And Cutting Slip Failures, James Paul
Reinforced Soil In The Repair Of Embankment And Cutting Slip Failures, James Paul
International Conference on Case Histories in Geotechnical Engineering
The paper considers the causes of slips in embankments and cuttings and examines the traditional methods of repair and reinstatement. Reinforced soil solutions are examined and compared with the more traditional systems. Following consideration of the structure and properties of a polymer geogrid for use in reinforced soil applications, two case histories are presented. The first involves the repair of a cutting slip in overconsolidated clay in S.E. England. Both the design method and construction system are examined along with indications of relative costs. The second example is a slip in a highway embankment in Sweden where a reinforced soil …
The Performance Behaviour Of A Grain Silo Foundation In Jeddah Supported On Stone Columns, D. L. Jones, G. J. Macdonald, M. H. Golder
The Performance Behaviour Of A Grain Silo Foundation In Jeddah Supported On Stone Columns, D. L. Jones, G. J. Macdonald, M. H. Golder
International Conference on Case Histories in Geotechnical Engineering
This paper describes the ground treatment carried out and the subsequent load settlement behaviour of a grain silo in Jeddah, Saudi Arabia. Predicted performance based on the results of both SPT and cone penetration tests are compared with actual behaviour. The prediction based on the SPT results is poor, with the cone penetration analyses giving a significant improvement. A knowledge of cone resistance and hence modulus values for the full depth of influence of the silo would have further refined the prediction.
The Rehabilitation Of Terminal 2 – A Case History, D. J. Hardin, M. L. Byington, S. V. Mills
The Rehabilitation Of Terminal 2 – A Case History, D. J. Hardin, M. L. Byington, S. V. Mills
International Conference on Case Histories in Geotechnical Engineering
The Port of Portland, Oregon recently completed the rehabilitation of the downstream portion of Terminal 2. The project included the placement of more than 1 million cy of dredged hydraulic sand fill and the construction of a 1,400-ft-long pile-supported wharf. Up to 60 ft of sand fill was placed over soft, submerged sediments. The silt along the toe of the slope was removed prior to placing the fill. No shear failures or mudwaves were detected during filling. The fill induced settlements of up to 63 in., which agreed well with the predicted maximum settlement of about 60 in. Underwater sand …
The Use Of Synthetic Liner And/Or Soil-Bentonite Liner For Groundwater Protection, Harl D. Sharma, Paul Kozicki
The Use Of Synthetic Liner And/Or Soil-Bentonite Liner For Groundwater Protection, Harl D. Sharma, Paul Kozicki
International Conference on Case Histories in Geotechnical Engineering
This paper briefly reviews the various liner materials, their properties and applications to prevent contaminate spread into the groundwater. Following this, two cases have been described that cite the use of two liner types for this purpose. One case provides the details of designing the reinforced CPE liner and its under-drainage system to store the fluids at a new petrochemical plant. The second case provides the details of designing and constructing a soil-bentonite liner for aerated lagoon facilities.
Past Proceedings: Second International Conference On Case Histories In Geotechnical Engineering, St. Louis (1988), Multiple Authors
Past Proceedings: Second International Conference On Case Histories In Geotechnical Engineering, St. Louis (1988), Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Second International Conference On Case Histories In Geotechnical Engineering, Multiple Authors
Second International Conference On Case Histories In Geotechnical Engineering, Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Organizing Committee, Multiple Members
Organizing Committee, Multiple Members
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Author's Index, Multiple Authors
Author's Index, Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Site Of An Oil Producing Property, H. Dezfulian
Site Of An Oil Producing Property, H. Dezfulian
International Conference on Case Histories in Geotechnical Engineering
An assessment of a 6.78-acre parcel of oil-producing land with one active, seven idle, and two abandoned oil wells was performed. Following the collection and review of site data, an evaluation was made of the toxic properties of on-site soils for the presence of hazardous substances. Soil samples were collected by advancing boreholes at eight locations. These locations were selected on the bas is of the results of an aerial photographs review, a geophysical survey, and statistical sampling design techniques. An analytical program was conducted to test for chemicals that would likely be present from the oil field operations. It …
A Case History Of Tehri Tunnels, B. Prabhakar, J. L. Jethwa, B. Singh
A Case History Of Tehri Tunnels, B. Prabhakar, J. L. Jethwa, B. Singh
International Conference on Case Histories in Geotechnical Engineering
Tehri Dam Project, a multipurpose river valley project, is being constructed in Garhwal, Himalaya. The project consists of a 260 m high earth and rock fill dam with a clay core, four diversion tunnels each of 11 m finish diameter, four head race tunnels each of 8.5 m finish diameter and two underground powerhouses cavities each measuring 180 m long, 49.5 m high and 21.5 m wide. The project is located near the district headquarters of Tehri in the state of Uttar Pradesh. The rock masses in the project area are fragile, tectonically active and geologically disturbed. The terrain is …
A Study Of A Road Landslide In Puerto Rico, C. Rodriguez-Pérez, L. Vázquez Castillo, C. Rodriguez-Molina, A. Vázquez Castillo
A Study Of A Road Landslide In Puerto Rico, C. Rodriguez-Pérez, L. Vázquez Castillo, C. Rodriguez-Molina, A. Vázquez Castillo
International Conference on Case Histories in Geotechnical Engineering
Numerous landslides have plagued the construction of a 1.3 mile road sector in the mountainous region of central Puerto Rico. The area is underlain by a sequence of landslide deposits overlying a muddy limestone and hard overconsolidated clayey soils. Landslides have occurred in both cuts and fills that have delayed the road construction for a period of more than two years, bringing as a result, great economic losses for the Puerto Rico Highway Authority. The landslide trigger mechanism has been intimately related to high rainfall, commonly observed in this region. The geotechnical and geological studies performed previous to the construction …
Case History Of Maneri-Uttarkashi Power Tunnel, R. K. Goel, J. L. Jethwa, B. Singh
Case History Of Maneri-Uttarkashi Power Tunnel, R. K. Goel, J. L. Jethwa, B. Singh
International Conference on Case Histories in Geotechnical Engineering
A 8.56 km long circular tunnel of 4.75 m diameter has been constructed under Maneri hydel project on the river Bhagirathi. The tunnel passes alternatively through quartzitic and metabasic rock formations of the young Himalayan terrain. Tunnel excavation was started from four faces, one at the upstream end at maneri, two from an intermediate adit at Heena, and one at the downstream end near Uttarkashi where a 80 MW surface powerhouse is located. In excavating the tunnel from different faces, the problems of tunnel face collapse with heavy ingress of water, cavity formations and large tunnel closures leading to buckling …
Rock Response In A 12-M Tunnel Through A Zone Of Low Strength, R. D. Prager, G. S. Grainger, R. L. Butts
Rock Response In A 12-M Tunnel Through A Zone Of Low Strength, R. D. Prager, G. S. Grainger, R. L. Butts
International Conference on Case Histories in Geotechnical Engineering
At the Rocky Mountain Pumped Storage Project a 12 meter diameter power tunnel was excavated through sedimentary rock for 760 meters. Approximately 10% of this tunnel was through Pennington shale that is described as a dark gray massive organic shale. This paper will describe the methods of testing .and rock characterization, the results of instrumentation and monitoring, and the post-construction testing program for the excavation, and conclude with a discussion of the observed rock response in relation to the measured strength and deformation properties. This particular zone of the tunnel required the addition of longer rockbolts, and a discussion of …
Stability Check Of Escarpment Using Finite Element Method, P. S. Khare, S. G. Kulkarni, S. L. Mokhashi
Stability Check Of Escarpment Using Finite Element Method, P. S. Khare, S. G. Kulkarni, S. L. Mokhashi
International Conference on Case Histories in Geotechnical Engineering
The valve house of the Tons Hydel Project, Madhya Pradesh, India is located just adjacent to a steep escarpment. The stability analysis of scarp near the valve house was made by the Central Water and Power Research Station, using finite element method. The problem was treated as a plain strain case. The analysis under self weight and with seepage forces indicated tensile stresses less than 4 kg/cm2 in the scarp. A proposal by the project authorities namely removing rock in the area above R.L.230 m at 74 degrees and filling lean concrete below the overhang was found to provide …
The Great Landslides In The East-Maritza Open-Cast Mines (Bulgaria) – A Theoretical Paradox In The Engineering Geology, Kiril Anguelov
The Great Landslides In The East-Maritza Open-Cast Mines (Bulgaria) – A Theoretical Paradox In The Engineering Geology, Kiril Anguelov
International Conference on Case Histories in Geotechnical Engineering
The exploitation of the opencast mines in the East-Maritza coal basin was proceeded of detailed explorations and analysis of the engineering geological conditions. Nevertheless, one of the greatest landslides in the engineering geological practice occurred within the period of 1966 - 1968. The volume of the sliding masses reached 30 - 75 x 106 m3. These landslides made questionable some of the classic formulations of the soil mechanics and engineering geodynamics, as for instance: - the possibility of formation of sliding surfaces with inclination opposite to the direction of sliding; - the validity of the Coulomb-Navier's law …