Engineering Commons^™

Predicting Performance Of Large-Diameter Buried Flexible Pipes: Learning From Case Histories, Koon Meng Chua, Larry J. Petroff

International Conference on Case Histories in Geotechnical Engineering

Analytical approaches to predicting pipe deflections are based on the predetermined pipe properties, the anticipated soil properties and on the assumption that the specified installation configuration can be met. However, in-place pipe deflections do often deviate from the predicted. This paper summarizes the observations made from more than twenty case histories of entrenched large-diameter flexible high density polyethylene pipes and discusses the effects of construction methods and site conditions on pipe performance. Procedures are also presented on how site conditions and construction methods can be accounted for when using the TAMPIPE (Texas A&M PIPE) method and the Spangler's method. Procedures …

Reconstruction Of The Settlement History Of Building, G. Hannink

International Conference on Case Histories in Geotechnical Engineering

Although it is a well-known fact that buildings can settle, it is often not known how much settlement has occurred since the construction. Three case studies in the Netherlands are presented which deal with the following questions: has the settlement process stopped or is it continuing and if so, what settlements can still be expected in the future? All three cases show large settlements of up to a maximum of 0.8 m since construction. This paper shows how the magnitude of the settlement since the construction can be reconstructed by analysing settlement data, covering only a relatively short period of …

The Failure Of Oil Storage Tanks And Their Control, Stanislav Dovnarovitch, Yurji Ivanov

International Conference on Case Histories in Geotechnical Engineering

The paper discusses of some results of flexible footings and their models behaviour in the case of loading-unloading cycles applied to them. The revealed effects have been used to explain the causes of some tanks failures. It has been shown that one of the possible causes is the difference between the displacements of the tank bottom and soil under it following unloading and subsequent loading. A simple technique has been proposed to prevent the failures that can be easily applied when constructing the tanks. The application of the technique both eliminates the causes of the failures and greatly reduces the …

Geotechnical Studies Of Foundation Of A Tilted Tank At Parikshatgarh, India, G. C. Nayak, B. Singh, P. K. Jain

International Conference on Case Histories in Geotechnical Engineering

An overhead tank of 200 KL capacity and 9 m staging was constructed in year 1975 at the ancient historical site at Parikshatgarh, Meerut, India. The depth of foundation is 1.6 m and inner and outer diameters of annular raft is 6.8 m and 10.3 respectively. In year 1978, the overhead tank was observed to be tilted. Detailed geotechnical studies have been conducted in 1987 to find out the causes of tilting of the tank and tilts have been measured every month for last one year. It is interesting to note that in spite of severe tilt of 4.3 cm/meter …

Settlement Predictions In Residual Soils By Dilatometer, Pressuremeter And One-Dimensional Compression Tests: Comparison With Measured Field Response, Roy H. Borden, William J. Sullivan, Weichen Lien

International Conference on Case Histories in Geotechnical Engineering

A case study investigating settlement predictions based on data from one dimensional compression, pressuremeter (PMT) and dilatometer (DMT) tests is presented. A relationship is established between PMT and DMT evaluated moduli and the standard penetration N values. These relationships are utilized in the settlement computations. The predictions obtained by each method are compared to the actual measured settlement. The column location at which settlement observations were made was instrumented with strain gages to measure the actual applied loads. A comparison between actual and design loads is made. Settlement predictions using PMT were performed utilizing two different existing approaches. A distinction …

Settlements In A Masonry Villa Caused By Trees, Filippo Ciuffi

International Conference on Case Histories in Geotechnical Engineering

Cracks in the masonry walls of a one storeyed villa due to foundation deformations are investigated in this paper. Particular attention is given to the analysis of the unusual causes of settlement.

Some Case Histories In Urban And Rural Geotechnical Engineering, S. I. Tsien

International Conference on Case Histories in Geotechnical Engineering

This paper presents several aspects of engineering performances including satisfactory, unsatisfactory but later remedied, and failure experiences in the fields of building foundation, underground construction, and slope stability problems. These projects were completed in China in the past decade. Five case records of performance are used as illustrative examples. Further research work are finally suggested.

Preface, Shamsher Prakash

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Disclaimer, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Conference Snapshots, Multiple Participants

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Accelerated Consolidation Of Soft Clays Using Wick Drains, J. R. Davie, M. R. Lewis, L. W. Young Jr.

International Conference on Case Histories in Geotechnical Engineering

Construction of the New Istana for the Sultan of Brunei required that fill slopes up to 85 feet high be placed on very soft compressible floodplain soils. Wick drains installed in the soft sediments accelerated their consolidation and reduced long-term settlements. The consolidation also produced a strength increase in the soft soils that allowed the fill to be constructed without danger of a major base slip failure. Instrumentation installed in the floodplain soils provided data on excess porepressures built up during the fill placement, and on the resulting settlements. The measured porepressures and settlements were in good agreement with the …

Advances In The Construction And Design Of Jet Grouting Methods In South America, Giorgio Guatteri, Joseph L. Kauschinger, Antonio C. Doria, Edward B. Perry

International Conference on Case Histories in Geotechnical Engineering

This paper presents a brief historical development of the two most popular jet grouting methods used in South America, namely, the chemical churning pile method (CCP) and jumbo jet grouting. Advantages and limitations of each procedure are cited. A brief discussion follows covering the history of CCP jet grouting in South America. Field trials performed to improve the design methodology and construction of CCP and jumbo jet grouted columns are presented. Finally, three case histories are presented to illustrate the use of jumbo jet grouting where limited head room exists, jet grouting in close proximity to pile supported structures, formation …

Designing Geotextile Support For Submarine Power Cables, K. Y. C. Chung

International Conference on Case Histories in Geotechnical Engineering

Six 36 cm diameter submarine pipe-cables were buried in a 1.2 km long, fabric-lined trench in the soft river mud under 17 m average water head across the Hudson River about 4.8 km north of the Newburgh Bridge, New York. This paper describes the design considerations based on geotechnical point of view of using geotextile to support submarine power cables.

Geogrid Reinforced Soil Retaining Wall On Compressible Soils, R. L. Curtis, V. E. Chouery-Curtis, D. A. Miller

International Conference on Case Histories in Geotechnical Engineering

A geogrid reinforced soil wall with a wrap-around facing system was successfully constructed on soft, compressible alluvial and residual soils. An originally designed 20-foot (6.1 m) high, reinforced concrete cantilever retaining wall was not constructed because of the expected settlements induced by the wall and backfill. The geogrid reinforced wall was utilized because of its ability to withstand the estimated settlement and because it was considered less expensive than providing deep foundation support of a cantilever wall. This paper discusses the design, construction, and performance of the geogrid reinforced wall.

Geotechnical Studies Of Foundation Of A Tilted Tank At Parikshatgarh, India, G. C. Nayak, B. Singh, P. K. Jain

International Conference on Case Histories in Geotechnical Engineering

An overhead tank of 200 KL capacity and 9 m staging was constructed in year 1975 at the ancient historical site at Parikshatgarh, Meerut, India. The depth of foundation is 1.6 m and inner and outer diameters of annular raft is 6.8 m and 10.3 respectively. In year 1978, the overhead tank was observed to be tilted. Detailed geotechnical studies have been conducted in 1987 to find out the causes of tilting of the tank and tilts have been measured every month for last one year. It is interesting to note that in spite of severe tilt of 4.3 cm/meter …

Impact Of Tunneling On Two Brick-Bearing-Wall Structures, Marco D. Boscardin

International Conference on Case Histories in Geotechnical Engineering

The responses or a pair or brick-bearing-wall structures to nearby construction or twin, shield driven 21-ft-diameter tunnels in soil are examined. Horizontal and vertical ground displacements are summarized and discussed, as well as, horizontal and vertical displacements, tilting, distortion, and damage sustained by the structures. Transient features or the developing settlement trough and effects on building response are also examined and discussed.

Long Term Building Performance Over An Injected Subgrade, Ronald F. Reed, Paul Wright

International Conference on Case Histories in Geotechnical Engineering

Several foundation designs and stabilization methods are used with varying degrees of success to cope with the problem of expansive clays. Many of these methods are very expensive, therefore alternate technology that is both cost and performance effective has been developed. This paper presents a case history with pre- and post- stabilization test data for a 4-building project where pressure injection of lime and water was used to preswell weathered clay-shale to a depth of 10 feet. Use of pressure injection technology economically reduced post construction movements to 0.5 inches to 1.8 inches over a 7 year monitoring period. Movements …

Recent Examples Of Cut And Fill Reinforcement On A41-Highway In France, Trân Vô Nhiêm

International Conference on Case Histories in Geotechnical Engineering

At EVIRES PASS, between ANNECY and MONT BLANC in FRANCE, subsoil is made up of unstable clayey natural versants and marly bedrock affected by previous or current slidings. The problems encountered during the new A41-Highway construction were aggravated by the proximity of Road and Railway located on top of the same versant. The final Design consisted of succession of cuts and embankments with special soil reinforcement techniques to improve stability. So two existing unstable Railway embankments were promptly consolidated by "soil nailing" with driven steel dowel-piles which were either anchored or not. Two other high cuts in marls and sandstones …

Operations-Based Training Strategy For Longwall Mining, R. Larry Grayson, Michael J. Klishis, Ronald C. Althouse, George M. Lies

Mining Engineering Faculty Research & Creative Works

A system that can be used to pinpoint the specific training needs of operations and assist in the design and upgrading of focused training approaches can benefit longwall mining. It can be directed at systematically correcting performance discrepancies at an individual, crew, or mine level, and also to challenge workers and management toward attaining improved performances. Such an approach involves a combination of features, such as diligence in monitoring and evaluating performances, thorough coordination in implementing changes, and effective use of operational data.

The Bureau of Mines, through contract with the Mining Extension Service of West Virginia University, has developed …

Premartensitic Anelasticity In Indium-Thallium Alloys., Manfred Wuttig, C. Y. Lei, Tetsuro Suzuki

Materials Science and Engineering Faculty Research & Creative Works

The linear and nonlinear low frequency internal friction of In-24 at. pct Tl displays a Curie-Weiss type behavior in the temperature range above the transformation temperature. The critical temperature equals the martensite start temperature. It is proposed that the origin of the observed internal friction is the diffusion-controlled interaction of substitutional atoms with the premartensitic strain modulation, tweed.

Structural Characterization Of A High-Temperature, Ionic Conducting Ceramic Using Perturbed Angular Correlation Spectroscopy, Gary L. Catchen, Michael Blaszkiewicz, Khalid Jamil, Dinesh K. Agrawal, Wayne Huebner, Herbert A. Mckinstry, Lorenz H. Menke Jr.

Materials Science and Engineering Faculty Research & Creative Works

Perturbed angular correlation (PAC) spectroscopy has been used to characterize several structural aspects of a high-temperature, ionic conducting ceramic, CaZr3.95Hf0.05P6O24. Hafnium was introduced into the material to provide the PAC probe nuclei, 181Hf/181Ta, which were located primarily at Zr sites. PAC measurements were made over a range of temperatures from 77 to 1180 K, and they have been analyzed and interpreted using several simple models. The distorted octahedral crystal field at the Zr site produced a (low-frequency) static electric quadrupole interaction which can be accurately described by the point-charge model. But, the temperature dependence of the associated electric field gradient …

A Comment On ‘Failure Modes Of Hybrid Composites …’, Serge Abrate

Mechanical and Aerospace Engineering Faculty Research & Creative Works

This paper comments on an earlier paper on the failure modes of hybrid composites by Pitkethly and Bader, which appeared in the Carbon Fiber Conference issue. © 1988 IOP Publishing Ltd.

Load And Resistance Factor Design Of Cold-Formed Steel Load And Resistance Factor Design Specification For Cold-Formed Steel Structural Members With Commentary, Ling-En Hsiao, Wei-Wen Yu, Theodore V. Galambos

CCFSS Library (1939 - present)

FOREWORD This progress report contains the following two parts: Part I: Load and Resistance Factor Design Specification for Cold-Formed Steel Structural Members (pp. i-101). Part II: Commentary on the Load and Resistance Factor Design Specification for Cold-Formed Steel Structural Members (pp. 103-148). The load and resistance factor design specification proposed herein is the revised version of the design recommendations prepared in September 1985 and submitted to American Iron and Steel Institute as Seventh Progress Report. This document was prepared according to the 1986 edition of the AISI Specification for the Design of Cold-Formed Steel Structural Members. The selections of ϕ …

Load And Resistance Factor Design Of Cold-Formed Steel: Calibration Of The Aisi Design Provisions, Wei-Wen Yu, Ling-En Hsiao, Theodore V. Galambos

CCFSS Library (1939 - present)

In the design of steel buildings, the "Allowable Stress Criteria" have long been used for the design of cold-formed steel structural members in the United States and other countries.' In view of the fact that the mathematical theory of probability, which has been so successfully applied in other fields of engineering, would seem to be equally applicable to cold-formed steel design by providing a more uniform degree of structural safety, the "Limit State Design" method based on the probabilistic concept has been used in Canada and Europe for the design of cold-formed steel structural members.' In the United States, a …

Load And Resistance Factor Design Of Cold-Formed Steel Comparative Study Of Design Methods For Cold-Formed Steel, Ling-En Hsiao, Wei-Wen Yu, Theodore V. Galambos

CCFSS Library (1939 - present)

Allowable Stress Design is the current method used to design cold-formed steel structural members and connections. In this design approach, factors of safety are used to compute the allowable design stresses which are compared to the actual maximum stresses that will occur in the member during the life of the structure. In recent years, the Load and Resistance Factor Design (LRFD) method has been developed for the design of hot-rolled steel shapes and the design of cold-formed steel structural members. This method is based on probabilistic and statistical techniques to account for the many uncertainties involved with the actual design. …

Design Of Cold-Formed Stainless Steel Structural Members Proposed Allowable Stress Design Specification With Commentary, Shin-Hua Lin, Wei-Wen Yu, Theodore V. Galambos

CCFSS Library (1939 - present)

INTRODUCTION This progress report on the design of cold-formed stainless steel structural members contains the following two parts: Part I: Proposed Specification for the Design of Cold-Formed Stainless Steel Structural Members (Third Draft). Part II: Commentary on the Proposed Specification for the Design of Cold-Formed Stainless Steel Structural Members (Second Draft). This project was sponsored by the American Society of Civil Engineers. The financial assistance provided by the Chromium Center, the Nickel Development Institute, and the Specialty Steel Industry of the United States is gratefully acknowledged. Special thanks are extended to members of the ASCE Steering Committee (Dr. Ivan M. …

The Distribution Of Chlorine And Iodine In Soil In The Vicinity Of Lead Mining And Smelting Operations, Bixby Area, S.E. Missouri, U.S.A., R. Fuge, M. J. Andrews, T. E. Clevenger, B. E. Davies, Nord L. Gale, C. F. Paveley, B. (Bobby) G. Wixson

Biological Sciences Faculty Research & Creative Works

Iodine and Cl are enriched in soils in the vicinity of the Magmont and Buick lead mines near Bixby, southeastern Missouri. The enrichments, up to 5.6 ppm I and 305 ppm Cl, are against regional background of 1.26 ppm I and 41 ppm Cl. The area of highest I and Cl is thought to reflect a zone of base metal sulphide mineralization occurring about 400 m below the surface. Iodine and Cl are also enriched in soils immediately adjacent to a tailings pond, hence these elements would appear to be leached from this source. A zone of enhanced I values …

Improved Streamline-Generating Technique That Uses The Boundary (Integral) Element Method, Daopu Thompson Numbere, D. Tiab

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

The boundary element method (BEM) has been used to generate streamlines for homogeneous and sectionally homogeneous reservoirs having irregular boundaries. This technique is superior to earlier methods that use 'image wells' to simulate the reservoir boundary, especially for cases where the reservoir boundary is irregularly shaped. It has wider applicability to different kinds of reservoirs and eliminates the need for trial-and-error solutions. The errors caused by discretization and numerical approximation arise on and adjacent to the boundaries only, therefore the pressures and pressure gradients on which the streamlines are derived can be calculated with very high accuracy in the interior …

Knowledge Organization And Inference Engine For The Wvu Face Decision Support System, S. Carrow, R. S. Nutter Jr., R. S. Raman, N. A. Reddy, Y. V. Reddy, R. Larry Grayson

Mining Engineering Faculty Research & Creative Works

The knowledge-based organization for the West Virginia University Face Decision Support System is given, along with the initial development of the associated inference engine. The knowledge base contains generic knowledge about underground coal mines that utilize continuous miners. A typical knowledge entry is given, and the inference engine methodology is explained. The engine utilizes this knowledge with data from monitoring systems and from interaction with the section foreman, to assist in making section management decisions and plans.

Characteristics And Optimal Design Of Variable Airgap Linear Force Motors, Ming-Chuan Leu, E. V. Scorza, D. L. Bartel

Mechanical and Aerospace Engineering Faculty Research & Creative Works

An analytical model for predicting the characteristics of variable airgap linear force motors is developed. the model takes into account magnetic losses including the leakage and fringing effects and the reluctance existing at the contacts between permanent magnets and pole pieces. the model is validated by comparing its predicted characteristics with the results obtained from experiments and a finite element program. with the use of the modelled characteristics, computer programs based on the method of constrained steepest descent with state equations are developed for automating and optimising the design of linear force motors. Numerical studies are made for both minimisation …