Open Access. Powered by Scholars. Published by Universities.®

Civil and Environmental Engineering Commons™

Open Access. Powered by Scholars. Published by Universities.®

Missouri University of Science and Technology

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 2671 - 2700 of 7869

Full-Text Articles in Civil and Environmental Engineering

Effects Of Internal Gas Explosion On An Underwater Tunnel Roof, Omar Al-Farouk Salem Al-Damluji, Akram Younis Thannon Al-Sa'aty, Rafi' Mahmoud Sulaiman Al-Nu'aimy May 2010

Effects Of Internal Gas Explosion On An Underwater Tunnel Roof, Omar Al-Farouk Salem Al-Damluji, Akram Younis Thannon Al-Sa'aty, Rafi' Mahmoud Sulaiman Al-Nu'aimy

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

An underwater reinforced concrete tunnel roof is subjected to an internal gas explosion. Dynamic analyses are performed for three cases, namely, (1) an uncoupled solution, (2) class II coupling analysis and (3) full model with class I and II couplings. Three load cases are considered, dead (gravity) load, uniformly distributed vertical loads from sand and water and finally an internal pressure gas explosion. Linear and non-linear constitutive relationships are considered for the materials constituting the gas explosion problem. Results include time deflection of tunnel roof, time histories of stresses in vertical reinforcing bars and contours of concrete stresses for tunnel …

Go to article

Effects Of Wall-Soil-Structure Interaction On Seismic Response Of Retaining Wall, Aditya Parihar, Navjeev Saxena, D. K. Paul May 2010

Effects Of Wall-Soil-Structure Interaction On Seismic Response Of Retaining Wall, Aditya Parihar, Navjeev Saxena, D. K. Paul

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Retaining walls have suffered damages under past earthquakes. Usually the analyses do not consider the retained soil’s interaction with the wall, which takes place during dynamic conditions. The consideration makes the wall-soil system more flexible than the wall alone. The conditions of separation of wall (during interactions) again change the dynamic characteristics of the assumed wall-soil system that needs to be addressed. The paper presents a study on the behavior of the retaining wall under static as well as seismic conditions considering above aspects. The wall-soil interaction model incorporates the modeling of interface between them. The system is idealized as …

Go to article

Numerical Simulation Of The Performance Of Cantilever Walls Subjected To Seismic Loading, Alberto Pettiti, Dominic Assimaki, Sebastiano Foti May 2010

Numerical Simulation Of The Performance Of Cantilever Walls Subjected To Seismic Loading, Alberto Pettiti, Dominic Assimaki, Sebastiano Foti

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The design of flexible earth retaining structures against seismic loading is a challenging geotechnical problem, and it is typically conducted using pseudo-static approaches, which do not adequately represent the transient loading conditions of earthquake motions. Numerical analyses of designed walls with simplified material models showed high stresses in the structure when subjected to both dynamic and pseudo-static conditions, and a very large amount of reinforcement would be required to avoid the formation of plastic hinges. On the other hand, detailed simulations with inelastic material behaviour would yield more realistic estimations of the retaining structural response and improve the efficiency of …

Go to article

A Comparison Of Local Site Conditions With Passive And Active Surface Wave Methods, Arif Mert Eker, Haluk Akgün, Mustafa Kerem Koçkar May 2010

A Comparison Of Local Site Conditions With Passive And Active Surface Wave Methods, Arif Mert Eker, Haluk Akgün, Mustafa Kerem Koçkar

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This study encompasses dynamic soil characterization and seismic hazard mapping of the Plio-Quaternary and especially Quaternary alluvial sediments of the Çubuk district and its close vicinity that is situated towards the north of Ankara. The project site is located at a region which has a potential of being seriously affected by a possible earthquake occurring along the Çubuk Fault Zone that is thought to be a continuation of the Dodurga Fault Zone and a sub-fault belt of the North Anatolian Fault System that is one of the most prominent fault systems in Turkey with significant earthquake potential. Non-invasive seismic methods …

Go to article

An Alternative Method For Probabilistic Seismic-Hazard Assessment: A Case Study Of Three Cities, Hing-Ho Tsang, Saman Yaghmaei-Sabegh, P. Anbazhagan, M. Neaz Sheikh, T. G. Sitharam, J. S. Vinod May 2010

An Alternative Method For Probabilistic Seismic-Hazard Assessment: A Case Study Of Three Cities, Hing-Ho Tsang, Saman Yaghmaei-Sabegh, P. Anbazhagan, M. Neaz Sheikh, T. G. Sitharam, J. S. Vinod

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The conventional source-based method of probabilistic seismic-hazard assessment is considered difficult to conduct for regions lacking adequate information on the source characteristics, or with a paucity of recorded strong ground motion data. Meanwhile, the historic method is unreliable in estimating the hazard at low probability. This paper proposes a midway approach, derived from the source-based method, yet does not require the characterization of seismic sources. While the method possesses the simplicity of the historic method, it is extended to account for large events that have not been observed historically, in order to improve the reliability of hazard calculation at low …

Go to article

Gis-Based Identification Of Topographic Sites In Italy With Significant Ground Motion Amplification Effects, Vera Pessina, Emilia Fiorini, Roberto Paolucci May 2010

Gis-Based Identification Of Topographic Sites In Italy With Significant Ground Motion Amplification Effects, Vera Pessina, Emilia Fiorini, Roberto Paolucci

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Surface topography can significantly affect earthquake ground motions, as suggested by many examples of unexpected damage suffered by buildings located on the top of hills, on ridges or along slopes. European and Italian seismic codes suggest topographic aggravation factors in the 1 – 1.4 range to be applied to seismic actions, depending not only on simple morphologic parameters (average slope angle, width and height of the relief) but also on the type of relief (isolated cliff or ridge) and on the location of the site relative to the relief. Furthermore, strongly irregular topographies should be dealt with by a specific …

Go to article

Preparation The Site Specific Spectrum For Civil Regions Of Zagross Mountains, Kaveh Andisheh, Seydeh Sara Hossini, Mortaza Taghizadeh May 2010

Preparation The Site Specific Spectrum For Civil Regions Of Zagross Mountains, Kaveh Andisheh, Seydeh Sara Hossini, Mortaza Taghizadeh

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

In this paper the site specific spectra for a region of the Zagros Mountains containing 5 cities in Kurdistan province of Iran is prepared. For this purpose, all the occurred earthquakes, containing both historical and instrumental events, in each 5 city have been gathered then main earthquakes was prepared by elimination the aftershocks, foreshocks, and the incorrect reported events from the data and main earthquakes were taken into consideration to calculate the seismic parameters by Kijko [2000] method considering uncertainty in magnitude and incomplete earthquake catalogue. All seismic sources of the region are modeled and recurrence relationship is established. After …

Go to article

Ground Motion Study On Dumbarton Toll Bridge, Te-Chih Ke, Hubert Law, Po Lam, Brian Maroney, Saba Mohan, Jason Weinstein May 2010

Ground Motion Study On Dumbarton Toll Bridge, Te-Chih Ke, Hubert Law, Po Lam, Brian Maroney, Saba Mohan, Jason Weinstein

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The existing Dumbarton Toll Bridge was built in 1982, connecting the cities of Newark and East Palo Alto in the San Francisco Bay Area. The initial vulnerability studies conducted by California Department of Transportation (Caltrans) in 2004 indicated that the performance of the bridge during a maximum credible earthquake was uncertain. Earth Mechanics, Inc. (EMI) has carried out the necessary study for the seismic evaluation of the bridge. An extensive field investigation was undertaken both on-land and over-water at the site to develop the idealized subsurface profile along the bridge alignment. According to the probabilistic and deterministic seismic hazard analyses …

Go to article

Ground Improvement By Dynamic Compaction At A Tailings Disposal Facility, Howard D. Plewes, Robert W. Chambers, Rick Friedel, Terence K. Jibiki, Alex Sy May 2010

Ground Improvement By Dynamic Compaction At A Tailings Disposal Facility, Howard D. Plewes, Robert W. Chambers, Rick Friedel, Terence K. Jibiki, Alex Sy

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper presents two case histories of ground improvement by dynamic compaction (DC) at the Myra Falls mine in Vancouver Island, British Columbia, Canada. Dynamic compaction was employed to densify soils at two sites within the operating mine: a waste rock dump beneath a new processing plant to reduce settlements beneath the structure foundations (Site A); and coarse fluvial and colluvial soils at the toe of an existing tailings embankment to improve seismic resistance against liquefaction (Site B). At Site A, the variable plant loadings required variable compaction energy to achieve uniform foundation performance. At Site B, the foundation soils …

Go to article

Numerical Study Of The Seismic Response Of An Urban Overpass Support System, Juan M. Mayoral, Francisco A. Flores, Miguel P. Romo, Manuel J. Mendoza May 2010

Numerical Study Of The Seismic Response Of An Urban Overpass Support System, Juan M. Mayoral, Francisco A. Flores, Miguel P. Romo, Manuel J. Mendoza

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A strategic urban overpass is to be built in the so-called transition and hill zones in Mexico City. The subsoil conditions at these zones typically consist on soft to stiff clay and medium to dense sand deposits, randomly interbedded by loose sand lenses, and underlain by rock formations that may outcrop in some areas. Several critical supports of this overpass are going to be instrumented with accelerometers, inclinometers and extensometers to assess their seismic performance during future earthquakes and to generate a database to calibrate soil-structure-interaction numerical models. This paper presents the seismic performance evaluation of one of these supports. …

Go to article

Microzonation Study Of Duzce, Turkey, Dimitra Manou, Maria Manakou, Maria Alexoudi, Anastasios Anastasiadis, Kyriazis Pitilakis May 2010

Microzonation Study Of Duzce, Turkey, Dimitra Manou, Maria Manakou, Maria Alexoudi, Anastasios Anastasiadis, Kyriazis Pitilakis

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Duzce in Turkey was severely damaged during the November 12th, 1999 earthquake (Mw 7.2). The paper presents different surveys and studies performed after the earthquake, which resulted in the microzonation study of the city. At first we collected and analyzed all available geophysical and geological data. Then we performed a well focused geophysical and geotechnical campaign comprising a sufficient number of shallow and deep boreholes, seismic down-hole tests, array measurements of microtremors and ambient noise measurements. The synthesis of all these data resulted in the construction of the seismic geotechnical map and the geometry of the “seismic bedrock” of the …

Go to article

Performance Of Solid Waste Soil In Earthquake Of Boroujerd And Silakhor, Hamed Niroumand May 2010

Performance Of Solid Waste Soil In Earthquake Of Boroujerd And Silakhor, Hamed Niroumand

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper presented survey of solid waste without geosynthetics in Boroujerd and Silakhor earthquake and it’s compared with a case of solid waste with geosynthetics under seismic in earthquake of Boroujerd. The result of performance of solid waste soils during earthquakes is the most real source of information on the seismic reaction of solid waste soils. The information from a big Broujerd and Silakhor earthquakes indicate that the typical performance of soils during earthquake is different. Thus, combined with the fact that limited soil with geosynthetic liners and no more waste soil with a geosynthetic use have been subjected to …

Go to article

Fault Hazard Characterization For A Transportation Tunnel Project In Coronado, California, James R. Gingery, Scott H. Rugg, Thomas K. Rockwell, Bruce R. Hilton May 2010

Fault Hazard Characterization For A Transportation Tunnel Project In Coronado, California, James R. Gingery, Scott H. Rugg, Thomas K. Rockwell, Bruce R. Hilton

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper presents the results of a fault hazard study performed as part of a proposed traffic tunnel project in Coronado, California. The 2.3 km alignment crosses the Coronado fault, which is considered active by the California Geological Survey. Although the location of the Coronado fault offshore of Coronado had been well established through previous studies, the fault had never been definitively located on land. A study was undertaken that utilized four principal investigation methods: a seismic reflection survey, large diameter borings, closely-spaced cone penetrometer tests (CPT) and a fault trench. This study was the first to positively locate the …

Go to article

San Diego Seismic Study – Lane Field, Garry W. Cannon, Joseph J. Vettel, Shawn Weedon May 2010

San Diego Seismic Study – Lane Field, Garry W. Cannon, Joseph J. Vettel, Shawn Weedon

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The Lane Field Property, located northwest of the intersection of Broadway and Pacific Highway on the San Diego Bay Embarcadero in downtown San Diego, California is slated for development of a 40-story, mixed-use, retail/hotel with two subterranean parking levels. Site conditions posed several challenges during the design and implementation of the geotechnical and geologic fault studies. The 6.2-acre site was reclaimed by dredge fill from San Diego Bay in approximately 1900 by the City of San Diego. Prior to 1900, the bay shoreline coincided approximately with the eastern edge of the property. A baseball park was built at the site …

Go to article

Seismic Hazard Evaluation For Design Of San Vicente Dam Raise, Leo D. Handfelt, Ivan Wong, Patricia Thomas, Timothy Dawson, Jim Zhou, Nicola Kavanagh May 2010

Seismic Hazard Evaluation For Design Of San Vicente Dam Raise, Leo D. Handfelt, Ivan Wong, Patricia Thomas, Timothy Dawson, Jim Zhou, Nicola Kavanagh

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The San Diego County Water Authority (Water Authority) is undertaking a raise of the existing San Vicente Dam to provide both emergency and carryover storage to increase local reservoir supplies in San Diego County, California, USA. The emergency storage is required in case of a disruption to the imported water transmission system from floods or earthquakes and the carry-over storage would be utilized to store water during “wet” seasons to carry-over to seasons of drought. The existing San Vicente Dam is a 220 foot (67 m) high concrete gravity dam completed in 1943 with 90,063 acre-feet of storage. The raised …

Go to article

The Rose Canyon Fault Zone In San Diego, Thomas Rockwell May 2010

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 …

Go to article

Behavior Of Model Piles In A Liquefiable Soil In Shaking Table Tests, Chia-Han Chen, Tzou-Shin Ueng May 2010

Behavior Of Model Piles In A Liquefiable Soil In Shaking Table Tests, Chia-Han Chen, Tzou-Shin Ueng

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The responses of model piles in a liquefiable ground under one- and two-dimensional shakings were studied in a physical model test using a large biaxial laminar shear box on the shaking table at the National Center for Research on Earthquake Engineering (NCREE), Taiwan. The model piles were made of stainless steel pipe and aluminum alloy pipe with an outer diameter of 101.6 mm and a wall thickness of 3.0 mm for the study of the soil-pile interactions with two kinds of stiffness of pile. Each model pile was placed in the shear box containing saturated clean fine sand. The pile …

Go to article

E-Defense Shaking Table Test On The Behavior Of Liquefaction-Induced Lateral Spreading Of Large-Scale Model Ground With A Pile-Foundation Structure Behind Quay Wall, Kentaro Tabata, Masayoshi Sato May 2010

E-Defense Shaking Table Test On The Behavior Of Liquefaction-Induced Lateral Spreading Of Large-Scale Model Ground With A Pile-Foundation Structure Behind Quay Wall, Kentaro Tabata, Masayoshi Sato

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

To investigate the behavior of liquefaction-induced lateral spreading of ground and mechanism of its influencing failure of structures, a shaking table test of a large-scale model with liquefiable sand deposit was performed at the E-Defense shaking table testing facility. The model in a rigid container 16 meters long, 4 meters wide and 5 meters high had a pile-foundation structure behind caisson-type quay wall in the deposit. About 900 sensors and other instrumentations were installed with the model, acquiring accelerations, strains, pore water pressures, and even large displacements occurred by extensive behavior. To the model, two-dimensional, horizontal and vertical motions based …

Go to article

Experimental Study Of The Dynamic Interaction Between The Foundation Of The Nees/Ucsd Shake Table And The Surrounding Soil, Ozgur Ozcelik, J. Enrique Luco, Joel P. Conte, Luis H. Mendoza May 2010

Experimental Study Of The Dynamic Interaction Between The Foundation Of The Nees/Ucsd Shake Table And The Surrounding Soil, Ozgur Ozcelik, J. Enrique Luco, Joel P. Conte, Luis H. Mendoza

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The results of an extensive experimental study of the dynamic interaction between the foundation block for the NEES/UCSD Large High Performance Outdoor Shake Table and the surrounding soil are presented. The vibrations induced by the two large NEES/UCLA eccentric mass shakers were recorded at multiple stations within the reinforced concrete foundation block and on the soil up to distances of 270 m from the block. The results obtained for the deformation pattern of the reaction block, the frequency response at selected stations on the block, and the average rigid-body motion of the foundation and its dependence on frequency for longitudinal …

Go to article

Ground Improvement Using Stone Column, K. S. Beena May 2010

Ground Improvement Using Stone Column, K. S. Beena

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The use of stone column (called granular piles) has proved to be an economical and technically viable ground improvement technique for construction on soft soils and has been successfully applied for the foundation structure like oil storage tanks, earth embankments, raft foundation etc. When the stone columns are installed in extremely soft soils, the lateral confinement offered by the surrounding soil may not be adequate to form the stone column. In such soil, encasing the stone column with a geotextile can induce required lateral confinement. Considering the cost aspect of stone columns, the major portion of the cost owes to …

Go to article

Numerical And Experimental Investigation Of Soil Behaviour Under Stationary Excitation, Holger Wienbroer, Daniel Rebstock, Gerhard Huber May 2010

Numerical And Experimental Investigation Of Soil Behaviour Under Stationary Excitation, Holger Wienbroer, Daniel Rebstock, Gerhard Huber

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The effect of earthquakes on the behavior of soil and/or structures is usually investigated using earthquake-like signals as input for loading. This holds true for most of numerical and experimental simulations. In contrast to those approaches sinusoidal excitation was used here. The benefit of this type of excitation is an increased observability of the system, which is a precondition for a systematic investigation. Since sinusoidal excitation allows a gradually, step by step increase of the applied loading, the state of the soil (density and effective stress) as well as pore water pressure are transient. Therefore they are varying slowly and …

Go to article

Displacement Ductility Capacity Of Fixed-Head Piles, Jiunn-Shyang Chiou, Cheng-Hsing Chen May 2010

Displacement Ductility Capacity Of Fixed-Head Piles, Jiunn-Shyang Chiou, Cheng-Hsing Chen

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This study performs a parametric study on the displacement ductility capacity of a fixed-head pile. The Winkler-beam model is employed, in which both the soil nonlinearity and pile nonlinearity are adequately considered. In this parametric study, the pile is regarded as a limited ductility structure which conditionally allows the pile deformation to enter the plastic range during loadings. The analysis variables include the axial force, the pile diameter, the longitudinal reinforcement ratio, and the soil stiffness. The relationships of the displacement ductility capacity of the pile to the curvature ductility capacity and to the over-strength ratio of the pile section …

Go to article

Evaluation Of Seismic Demand Of Pile Foundation For Performance Based Design, M. H. Baziar, A. H. Ghaderinia May 2010

Evaluation Of Seismic Demand Of Pile Foundation For Performance Based Design, M. H. Baziar, A. H. Ghaderinia

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Accurate prediction of seismic performance of structures is important in reducing risks from earthquakes. Within the context of emerging performance-based earthquake engineering trends, seismic performance is measured with respect to the demand of engineering systems during a seismic event as opposed to the conventional factor of safety approach. Investigation of the correlation between so-called engineering demand parameters and various intensity measures has received substantial attention in earthquake engineering, as accurate prediction of seismic demand is desired in performance based seismic design. In this study the seismic demand of pile foundations are investigated in a performance based approach. A soil-pile-superstructure model …

Go to article

Overview Of The Seismic Threat In The Central United States, J. David Rogers, Deniz Karadeniz May 2010

Overview Of The Seismic Threat In The Central United States, J. David Rogers, Deniz Karadeniz

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper summarizes geological, geophysical and seismological studies in two accepted and one candidate seismic zones in the central United States. The area was shaken by as many as 2,000 felt earthquakes in 1811-12, including four events greater than Magnitudes 7.0. These occurred before the area west of the Mississippi River was settled, so the intensity of shaking was not recorded over much of the affected region. Earthquakes in the central United States are felt over a much broader area than similar magnitude earthquakes in the western United States because of the low attenuation associated with undeformed Paleozoic age strata …

Go to article

Performance-Based Design Of Geotechnical Structures: Recent Advances, Susumu Iai, Tetsuo Tobita May 2010

Performance-Based Design Of Geotechnical Structures: Recent Advances, Susumu Iai, Tetsuo Tobita

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The paper presents an overview of recent advances in earthquake geotechnical engineering with respect to the seismic design of geotechnical structures. The modern principles in seismic design are described along the framework of performance-based design as adopted in the International Standard (ISO23469). With the growing awareness of the need to understand the effect of non-linearity in soils and soil-structure interaction, the paper discusses the highly non-linear response of ground during strong earthquake motions with a peak ground acceleration exceeding 1g, and the highly non-linear behavior of soil-pile interaction, including soil-pile separation. The modern principles in seismic design described in this …

Go to article

Pushover And Inelastic-Seismic Response Of Shallow Foundations Supporting A Slender Structure, George Gazetas, Andriani I. Panagiotidou, Nikos Gerolymos May 2010

Pushover And Inelastic-Seismic Response Of Shallow Foundations Supporting A Slender Structure, George Gazetas, Andriani I. Panagiotidou, Nikos Gerolymos

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The interaction between a surface foundation and the supporting inelastic soil under the action of monotonic, cyclic, and seismic loading is studied numerically. The foundation supports an elastic tall system, the horizontal loading of which induces primarily an overturning moment and secondarily a shear force. Starting from linear elastic behavior, the footing eventually uplifts from the soil, provoking strong inelastic soil response culminating in development of a bearing–capacity failure mechanism and progressive settlement. The substantial lateral displacement of the pier mass induces an additional aggravating moment due to P–δ effect. The paper outlines the moment–rotation–settlement relations under monotonic loading at …

Go to article

Comparison Between Clean Sand Liquefaction Charts Based On Penetration Resistance And Shear Wave Velocity, Ricardo Dobry May 2010

Comparison Between Clean Sand Liquefaction Charts Based On Penetration Resistance And Shear Wave Velocity, Ricardo Dobry

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A comparison is conducted between clean sand liquefaction charts based, respectively, on normalized point penetration resistance in CPT static cone tests (qc1N) and shear wave velocity (Vs1). Examination of the shape of these field-calibrated curves, review of the factors influencing liquefaction resistance in the laboratory, field correlations between qc1N and Vs1, and field and laboratory evidence related to some of the factors influencing cone penetration resistance and shear wave velocity in sands, are all used in the discussion. It is concluded that the difference between the shapes of the two charts at the …

Go to article

I.M. Idriss: A Pioneer In Geotechnical Earthquake Engineering, W. D. Liam Finn May 2010

I.M. Idriss: A Pioneer In Geotechnical Earthquake Engineering, W. D. Liam Finn

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

Go to article

Criterions, Prediction And Prevention Of Loess Liquefaction, Lanmin Wang, Zhongxia Yuan, Haimei Sun, Jin Deng May 2010

Criterions, Prediction And Prevention Of Loess Liquefaction, Lanmin Wang, Zhongxia Yuan, Haimei Sun, Jin Deng

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Although loess liquefaction is not very common during earthquakes in Northwest of China, it is disastrous if it happens. Both study and valid evidence from Haiyuan 8.5 Earthquake in 1920 and Tajikistan 5.9 Earthquake in 1989 have proved that loess liquefaction could be very disastrous under certain conditions. In this paper, the criterions of loess liquefaction are discussed to show that unlike typical liquefaction of sand, loess which falls into the category of both silt clay and clayey silt has unique characteristics during liquefaction test. To predict liquefaction of loess, a simple method based on laboratory test and field evidences …

Go to article

Ground Improvement For Increasing Lateral Pile Group Resistance, Kyle M. Rollins, Matthew E. Adsero, Mark A. Herbst, Nathan Lemme May 2010

Ground Improvement For Increasing Lateral Pile Group Resistance, Kyle M. Rollins, Matthew E. Adsero, Mark A. Herbst, Nathan Lemme

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Lateral load tests were performed on a full-scale pile cap in untreated clay along with pile groups involving (a) excavation and replacement with sand backfill, (b) a soilcrete wall along the side of the pile group, and (c) a jet grouted zone below the pile cap. The average compressive strength of the soft, plastic clay increased from an average of 50 kPa to an average of about 1000 kPa with soil mixing (10% cement) and to 3000 kPa with jet grouting (20% cement). Excavation and replacement only increased resistance by about 20%; however, the soil mixed wall increased resistance by …

Go to article

First Prev Next Last