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Articles 31 - 60 of 113
Full-Text Articles in Entire DC Network
Evaluating Seismicity Parameters Of Sanandaj, Iran Based On Instrumental Earthquakes, Kaveh Andisheh, Gholamreza Ghodrati Amiri, Motaza Taghizadeh
Evaluating Seismicity Parameters Of Sanandaj, Iran Based On Instrumental Earthquakes, Kaveh Andisheh, Gholamreza Ghodrati Amiri, Motaza Taghizadeh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The main goal of this paper is to evaluate the seismic parameters of Sanandaj, Iran. For this reason, at first, all the occurred instrumental earthquakes (1900-2006) in a radius of 200 km of Sanandaj city have been gathered. After elimination of the aftershocks and foreshocks, the main earthquakes were taken into consideration to calculate the seismic parameters by Gutenberg-Richter method, cumulative distribution functions, and Kijko-Sellevoll approach. This paper aims at estimation of seismicity parameters based on the seismic events and the relation between the cumulative frequency of earthquake occurrence and its magnitude. For this purpose the variable windows in time …
Uniform Seismic Hazard Spectra Of Sanandaj, Iran, Kaveh Andisheh, Gholamreza Ghodrati Amiri, Seyed Ali Razavian Amrei
Uniform Seismic Hazard Spectra Of Sanandaj, Iran, Kaveh Andisheh, Gholamreza Ghodrati Amiri, Seyed Ali Razavian Amrei
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents uniform seismic hazard spectra of Sanandaj city of Iran. Sanandaj is the administrative center of Kurdistan province, in which more than 500,000 people live in. A collected catalogue, containing both historical and instrumental events and covering the period from the 10th century BC to the year 2006, is used. Then seismic sources and The seismotectonic model of the considered region have been modeled within the radius of 200 km and recurrence relationship is established. After elimination of the aftershocks and foreshocks, the main earthquakes were taken into consideration to calculate the seismic parameters. For this purpose the …
The Rose Canyon Fault Zone In San Diego, Thomas Rockwell
The Rose Canyon Fault Zone In San Diego, Thomas Rockwell
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The Rose Canyon fault bisects the City of San Diego, producing much of the unique beauty of the city with the uplift of Mt. Soledad and subsidence producing the natural harbor of San Diego Bay. Geologic studies demonstrate that the late Quaternary slip rate is in the range of 1-2 mm/yr, which although only a fraction of the plate margin slip budget, has the potential to produce major damage in “America’s finest city”. Paleoseismic trenching in La Jolla and downtown San Diego indicate that the most recent surface rupture occurred only a few hundred years ago, sometime after about AD1523 …
Understanding Seismic Embankment Dam Behavior Through Case Histories, Pedro Simão Sêco E Pinto
Understanding Seismic Embankment Dam Behavior Through Case Histories, Pedro Simão Sêco E Pinto
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
From the lessons learned from past earthquakes, it is noticed that modern embankment dams withstand the design earthquake without significant damages. In spite of this scenario it is important to prevent the occurrence of incidents and accidents of embankment dams during the earthquakes and so a deep understanding of the triggering factors is important. Well documents case histories from many parts of the world related embankment dams behaviour during recent earthquakes were carefully selected and are discussed. Based in the governed factors attention is given to the requirements for materials characterization, modelling, analysis, monitoring and safety evaluation. Ageing effects and …
Cretaceous/Paleogene Boundary Biostratigraphy And Palynofacies Of The Alo-1 Well, Southeastern Nigeria, Janet Diane Raymer
Cretaceous/Paleogene Boundary Biostratigraphy And Palynofacies Of The Alo-1 Well, Southeastern Nigeria, Janet Diane Raymer
Masters Theses
"The Cretaceous/Paleogene boundary (K/Pg) has been studied in great detail because of the fascination most people have with the extinction of the dinosaurs. The response of the vegetation to this extinction event has been studied in detail in mid to high latitudes, but little is known about what happened in the tropics. Sixty-seven samples from the Nsukka and Imo formations in the Alo-1 well in the Anambra Basin, southeastern Nigeria have been studied for their palynological contents. The aims of the study was to use spores, pollen and dispersed organic matter components to interpret biostratigraphy, and evaluate depositional conditions across …
Ancient Landslide Reactivation At The Viaduct No. 1 Located On The Caraca-La-Guaira Highway In Venezuela, Luis B. Fargier-Gabaldón, Daniel A. Salcedo, Rosendo Camargo-Mora
Ancient Landslide Reactivation At The Viaduct No. 1 Located On The Caraca-La-Guaira Highway In Venezuela, Luis B. Fargier-Gabaldón, Daniel A. Salcedo, Rosendo Camargo-Mora
International Conference on Case Histories in Geotechnical Engineering
Reactivation of an ancient landslide detected in 1987 affected the southern side of the Viaduct No.1 located in the Caracas-La Guaira highway, which connects Caracas, capital of Venezuela, with its main seaport and the Simon Bolivar International Airport. The Viaduct was built in 1953 and covered a gorge of approximately 300 m. It consisted of three parallel double-hinged arch ribs made of plain concrete spanning over approximately 152 m and two smaller access Viaducts on either side of the arch rib span. This paper summarizes the results from geotechnical investigation, the evaluation of inclinometers readings and surface control points and …
State Of The Art And Practice (Soap), Multiple Authors
State Of The Art And Practice (Soap), Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Analysis Of Dam Behaviour After Eighty Years Of Service, Paolo Croce, Giuseppe Modoni
Analysis Of Dam Behaviour After Eighty Years Of Service, Paolo Croce, Giuseppe Modoni
International Conference on Case Histories in Geotechnical Engineering
The paper reports on the behaviour of a masonry dam built in the Italian Alps in the early twenties of the last century and still in operation for electric power supply. The dam is 31 m high and its waterproofing is ensured by a multi-layered impervious facing, a concrete cut-off and a grout curtain protruding into the foundation soils. The geological location of the dam is rather complex, because its left abutment is located on a rock formation while the right one rests on a thick moraine deposit. Since its first impounding, large downstream water flows and significant movements of …
Geotechnical Assessment And Evaluation Of The Impact Of Kachchh (Bhuj) India 2001 Earthquake, Indra Prakash, D. M. Pancholi
Geotechnical Assessment And Evaluation Of The Impact Of Kachchh (Bhuj) India 2001 Earthquake, Indra Prakash, D. M. Pancholi
International Conference on Case Histories in Geotechnical Engineering
Intraplate earthquakes are ongoing activity in the Kachchh region. The area is seismically active and falls in Zone V of the seismic Zoning Map of India. The devastating Bhuj (Kachchh) Earthquake of MS 7.6 occurred in this zone on 26th January, 2001 causing severe damage to civil engineering structures and loss of human life. The surface manifestations of deformation of this earthquake include fractures/ fissures, lateral spread, slump, subsidence, upheaval, sand blows and craters. Bhuj Earthquake has caused considerable damage to earth dams lying in isoseist VIII and above in Kachchh. Damages to dams are in the form of longitudinal …
Extinction Pattern Of Reef Ecosystems In Latest Permian, Yasheng Wu, Jiasong Fan, Hongxia Jiang, Wan Yang
Extinction Pattern Of Reef Ecosystems In Latest Permian, Yasheng Wu, Jiasong Fan, Hongxia Jiang, Wan Yang
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Studies of two Permian-Triassic boundary (PTB) sections on top of a Changhsingian reef in Ziyun, Guizhou Province, southwestern China indicate that the end-Permian mass extinction of reef ecosystems occurred in two steps. The first step is the extinction of all stenotropic organisms such as calcisponges and fusulinids in the latest Permian (in the Clarkina yini conodont zone). The biota after the first extinction is simple, comprising eurytropic organisms including microgastropods, ostracods, and some small burrowing organisms, or only algal mats. At the beginning of the Early Triassic (i.e. the beginning of the Hindeodus parvus zone), the environments became anoxic, and …
An Investigation Of Lead And Other Metal Contaminants In The Sediments Of Clearwater Lake, Missouri, Gary W. Krizanich
An Investigation Of Lead And Other Metal Contaminants In The Sediments Of Clearwater Lake, Missouri, Gary W. Krizanich
Doctoral Dissertations
"The purpose of this investigation is to characterize the spatial and temporal distribution and concentration of trace metals in sediments of Clearwater Lake. Understanding how trace metals are released to and transported in aquatic environments is important to the overall understanding of the impacts of mining on the natural environment. The main focus of this research will be on historic sedimentation within Clearwater Lake, which may act as a sink where mining related trace metals are stored. Because of their high preservation rates in basins, sediments can provide detailed chronostratigraphic histories of trace metal inputs in lakes. Sediment records can …
A Case History Of Site Instability Due To The Presence Of A Shale Layer Above Sloping Bedrock, Sanjeev Kumar, Braja M. Das, Michael L. Hall
A Case History Of Site Instability Due To The Presence Of A Shale Layer Above Sloping Bedrock, Sanjeev Kumar, Braja M. Das, Michael L. Hall
International Conference on Case Histories in Geotechnical Engineering
A study conducted for St. Louis County of Missouri, United States of America classified several areas of the county as unstable for any type of construction because of the presence of high plastic shaley clay or clayey shale on sloping bedrock. These areas are considered to have a potential for site instability to occur due to any change in natural conditions that may increase the moisture content of the high plastic shaley clay or clayey shale. A two-story parking garage, founded on shallow foundations, constructed in one of the potentially unstable zones, showed some movement after several years of its …
Environmental Geotechnics To Study A Historical Town, Filippo Ciuffi
Environmental Geotechnics To Study A Historical Town, Filippo Ciuffi
International Conference on Case Histories in Geotechnical Engineering
The present paper summarizes the original approach, the different stages and the most innovative results of an interdisciplinary research activity, carried out on the subsoil of a historical site, in a seismic area, in Italy: the old town of Potenza, capital of the Basilicata Region. The entire Research-work has been designed and implemented within a total period of about 3 years. The paper is divided into twelve paragraphs and is organized logically, so that the reader can follow the development sequence of the different, interdisciplinary activities, detailed in the “Research General Flow-Chart”. After the Introduction [paragraph 1.0.0], the Philosophical Approach …
Eleven Case Studies Of Failures In Geotechnical Engineering, Engineering Geology, And Geophysics: How They Could Have Been Avoided, David Cummings, Frank J. Kenton
Eleven Case Studies Of Failures In Geotechnical Engineering, Engineering Geology, And Geophysics: How They Could Have Been Avoided, David Cummings, Frank J. Kenton
International Conference on Case Histories in Geotechnical Engineering
When a failure occurs, geotechnical engineers, engineering geologists, and geophysicists assign its cause to an event that immediately precedes the failure, such as an earthquake, heavy rainfall, flood, or other natural event. Assigning the failure to the immediate event is misplaced; the metastasis occurred because marginally stable conditions were allowed to exist through substandard investigations by the technical personnel, improper design, and inadequate review by the permitting agency. The fundamental cause of the failure is human error and is manifested in one or more of six categories. (1) Before the investigation, during discussions with the client. (2) During the investigation, …
Stone Column Ground Improvement Against Liquefaction For The Preveza-Aktio Immersed Tunnel, Christos Vrettos, Stavros Savidis
Stone Column Ground Improvement Against Liquefaction For The Preveza-Aktio Immersed Tunnel, Christos Vrettos, Stavros Savidis
International Conference on Case Histories in Geotechnical Engineering
The construction of the road fixed-link crossing between Preveza and Aktio on the north-western coast of Greece has recently been completed. The project consists of an immersed single-tube tunnel under the strait and two cut-and-cover tunnels at the ends of the immersed part. The immersed section is constructed of eight precast rectangular concrete elements placed on the sea bottom at a depth of 25 m. The site is characterized by high seismicity. Foundation soil consists of Holocene marine sediments comprising irregular layers of sands, silts and clays that extend to great depth in the central part of the strait. Along …
Impact Of Geographical Information Systems On Geotechnical Engineering, J. David Rogers, Ronaldo Luna
Impact Of Geographical Information Systems On Geotechnical Engineering, J. David Rogers, Ronaldo Luna
International Conference on Case Histories in Geotechnical Engineering
Over the last four decades Geographical Information Systems (GIS) have emerged as the predominant medium for graphic representation of geospatial data, including geotechnical, geologic and hydrologic information routinely used by geotechnical and geoenvironmental engineers. GIS allow unlimited forms of spatial data to be co-mingled, weighted and sorted with any number of physical or environmental factors. These data can also be combined with weighted political and aesthetic values to create hybrid graphic products capable of swaying public perceptions and decision making. The downside of some GIS products is that their apparent efficacy and crispness can also be deceptive, if data of …
Meet Our Authors And Speakers, Multiple Authors
Meet Our Authors And Speakers, Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Estimation Of Maximum Advance In Kaka-Reza Water Conveyance Tunnel At 700 Meter Depth, D. Azizmohammadi, H. Abbasi
Estimation Of Maximum Advance In Kaka-Reza Water Conveyance Tunnel At 700 Meter Depth, D. Azizmohammadi, H. Abbasi
International Conference on Case Histories in Geotechnical Engineering
The purpose of this research is the determination of maximum rate of advance in one stage of blasting in middle zone of Kaka-Reza water conveyance tunnel. In this zone of tunnel with average 700 meters of overburden, based on geological and geo-mechanical conditions, the supporting system will install immediately after excavation. The methodology of this research is combined of direct strain evaluation technique (DSET), numerical modeling (FLAC 2D) and convergence analysis. The research is done in three stages. At the first stage, the allowable strain in surrounding rock mass of tunnel is calculated based on DSET. At the second stage, …
Temporal Variation Of Seismic B-Values Beneath Northeastern Japan Island Arc, Aimin Cao, Stephen S. Gao
Temporal Variation Of Seismic B-Values Beneath Northeastern Japan Island Arc, Aimin Cao, Stephen S. Gao
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Analysis of a high quality seismic catalog reveals that the average of seismic b-values in the crust beneath most part of northeastern Japan island arc decreased from 0.86 between 1984 and 1990, to 0.73 between 1991 and 1995. The two areas with the largest decrease are found to be in the same areas where the coupling between the North American and the Pacific plates is the highest, as suggested by a recent geodetic study. In the same time period, the annual seismic moment release increased by 10 times. In addition, there seems to be a corresponding increase in volcanic activities …
Near Source Strong Ground Motion Simulation For Kocaeli Earthquake (1999), Abdullah Can Zulfikar, Hirokazu Takemiya
Near Source Strong Ground Motion Simulation For Kocaeli Earthquake (1999), Abdullah Can Zulfikar, Hirokazu Takemiya
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A near field strong ground motion simulation was carried out due to fault rupturing in the Kocaeli Earthquake (1999). The ground motions are simulated by the convolution scheme in time for source function and in space along rupture direction with the layered soil Green's function method based on the kinematic dislocation model. The effects of the asperities in the fault rupturing are focused considering inhomogeneous rupture mechanism in terms of a multiple asperities. The synthetic motions based on the inversion information from the observed data are compared well with the YPT (Yarimca Petrochemical Complex) record of the Kocaeli Earthquake. The …
Dam Engineering — Earthquake Analysis, Pedro Simão Sêco E Pinto
Dam Engineering — Earthquake Analysis, Pedro Simão Sêco E Pinto
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The performance of dams subjected to earthquakes is addressed with particular emphasis of recent earthquakes. Analysis of dams stability during earthquakes by experimental and mathematical models is referred. Foundation studies for soil and rock materials are described and assessment of liquefaction potential is discussed. Selection of design earthquakes by deterministic and probabilistic criteria is presented. Also neotectonics and attenuation relations are described. Monitoring and dam safety during construction and operation are addressed. Reservoir induced seismicity and prototype dynamic tests are treated. Ageing effects and rehabilitation of dams are discussed. Benefits and concerns of dams are referred. Risk analysis is addressed. …
Faculty Senate Minutes 2000 - 2001, Missouri University Of Science And Technology Faculty Senate
Faculty Senate Minutes 2000 - 2001, Missouri University Of Science And Technology Faculty Senate
Minutes & Agendas
No abstract provided.
The Missouri Miner, December 08, 1999
The Missouri Miner, December 08, 1999
The Missouri Miner Newspaper
No abstract provided.
Role Of In-Situ Testing In Geotechnical Earthquake Engineering, M. Jamiolkowski, D.C. F. Lopresti, O. Pallara
Role Of In-Situ Testing In Geotechnical Earthquake Engineering, M. Jamiolkowski, D.C. F. Lopresti, O. Pallara
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The available in situ testing techniques of special relevance in Geotechnical Earthquake Engineering are subject to a synthetic review in the light of the general framework of soil stress-strain behavior. Especial attention is devoted to the recent innovations and current capabilities of in situ testing methods to assess the shear modulus G and damping ratio D. The determination of the undrained steady state shear strength via penetration and seismic tests is also discussed.
The Missouri Miner, November 09, 1994
The Missouri Miner, November 09, 1994
The Missouri Miner Newspaper
No abstract provided.
Full Scale Field Test On A Slope Progressive Failure, I. Stanculescu, C. Athanasiu, A. Chirică, I. I. Stănculescu, E. Georgescu
Full Scale Field Test On A Slope Progressive Failure, I. Stanculescu, C. Athanasiu, A. Chirică, I. I. Stănculescu, E. Georgescu
International Conference on Case Histories in Geotechnical Engineering
In order to obtain the mechanical behaviour parameters of the red structured clays from the Danube- Black Sea Canal and to estimate the behavior of the slopes cut in such clays, an experimental programme was carried out. A checked failure was provoked for a slope dug in red fissured clays. The paper presents the results of the field investigations and the laboratory test regarding the, characteristics of the structured clays, as well as the in situ measurements during the experimental programme. The results of these measurements are compared with those obtained by numerical symulation using a computer program.
Rock Slides Along Haibat Sultan Road, N. Iraq, S. N. Al-Saadi, S. H. Al-Jassar
Rock Slides Along Haibat Sultan Road, N. Iraq, S. N. Al-Saadi, S. H. Al-Jassar
International Conference on Case Histories in Geotechnical Engineering
The instability of rock slopes controlling the main Arbil-Sulaimaniya road has been studied in the southwestern side of Haibat Sultan Mountain, northern Iraq. The cause of this instability is the presence of road cuts as well as the erosion at the toe of the slope. The military operations in the area have further increased the hazardous condition of the slope. Field observations at ten stations have revealed that plane sliding of limestone slabs had occurred within the layers of friable marl. The study focused on the mode of failure, as affected by slope orientation and discontinuity geometry. Subsequent monitoring revealed …
Soil Response During The 1988 Armenia Earthquake, M. K. Yegian, V. G. Ghahraman, G. Gazetas
Soil Response During The 1988 Armenia Earthquake, M. K. Yegian, V. G. Ghahraman, G. Gazetas
International Conference on Case Histories in Geotechnical Engineering
Building damage statistics from the 1988 Armenia earthquake are presented and discussed. These statistics are correlated to the local soil profiles in the two major cities of Leninakan and Kirovakan. The soil amplification effects on building damage during this earthquake are investigated. One-dimensional site response analysis results and valley effects are presented to explain the extent and pattern of damage in the two cities.
Geotechnical Problems Of Dam Sites And Their Solution With Reference To The Projects Of Eastern India, S. Gangopadhyay
Geotechnical Problems Of Dam Sites And Their Solution With Reference To The Projects Of Eastern India, S. Gangopadhyay
International Conference on Case Histories in Geotechnical Engineering
Geotechnical problems of dam construction are associated with adverse geological conditions of the dam site like soft rock, fault, shear zone, joints, weathering, permeable bouldery deposit, soluble rocks, ancient slide etc. In many of the dam sites of eastern India where one or more of such adverse conditions exist, the dam could be safely constructed by treatment of foundation defects. In some cases, however, a new site with less geologic problem was chosen with consequent modification in the project scheme.
Missouri S&T Magazine, May 1991, Miner Alumni Association
Missouri S&T Magazine, May 1991, Miner Alumni Association
Missouri S&T Magazine
No abstract provided.