Open Access. Powered by Scholars. Published by Universities.®
Articles 31 - 60 of 346
Full-Text Articles in Geotechnical Engineering
Earthquake Damage Done At Right Angles To Epicentral Direction, Makoto Nasu
Earthquake Damage Done At Right Angles To Epicentral Direction, Makoto Nasu
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In order to make clear the structures of grounds which are liable to induce earthquake damage, the relations between seismic deformation of various objects and the structures of the grounds under them, and the intersectional angles between the epicentral direction and their longitudinal axes and between the epicentral direction and the deformational directions have been investigated on the basis of many examples of such damage. Various objects such as embankments on heterogeneous grounds, for example, grounds including inclined soft soil layer or made of soft soil layer with inclined bottom, or various objects straddling soft and hard grounds, are Liable …
Fault Induced Ground Deformations And Their Effect On Structures, Luis E. Vallejo, Mahiru Shettima
Fault Induced Ground Deformations And Their Effect On Structures, Luis E. Vallejo, Mahiru Shettima
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In the United States and in many other regions of the world, structures such as earth dams are built in areas very close to strike-slip faults. For the safe design of these and other types of structures, geotechnical engineers need a reliable estimate of the ground deformations that fault movement will induce at the site of the proposed structures. In this study, the vertical ground deformations induced by the movement of one strike-slip fault segment is estimated with the use of Linear Elastic Fracture Mechanics (LEFM) theory. The ground deformations estimated using this theory and the deformations experienced by the …
Geological And Seismicity Evaluation Of Srinagarind Dam, S. Klaipongpan, V. Chakramanont, J. Pinrode, P. Chittrakarn
Geological And Seismicity Evaluation Of Srinagarind Dam, S. Klaipongpan, V. Chakramanont, J. Pinrode, P. Chittrakarn
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In April of 198 3, a sequence of earthquakes were recorded by the National Seismic Network where the epicenters were located in the upper reaches of the Srinagarind Reservoir. A detailed evaluation of these earthquakes has been initiated since that time. Network of micro seismic instruments have also been installed in the region in order to establish the capability of higher resolution for seismic parameters and allow the greater understanding of the mechanism of the activity. After seven years of monitoring and data collecting, analyses of the results have been performed. Results obtained from the evaluation of overall characteristic seismicity, …
Guerrero Accelerograph Array: Status And Selected Results, J. G. Anderson, A. Mendez, R. Quaas, J. N. Humphrey, R. Castro, S. K. Singh
Guerrero Accelerograph Array: Status And Selected Results, J. G. Anderson, A. Mendez, R. Quaas, J. N. Humphrey, R. Castro, S. K. Singh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper summarizes the history and rational for installation of the Guerrero accelerograph array. The array is producing unprecedented quantities of high quality digital strong motion data. Recent research using the array data has included studies on attenuation, site effects, scaling of spectra with magnitude, the ratio of vertical to horizontal accelerations, and the source of the September 19, 1985 earthquake.
Prediction Of Characteristics Of Surface Wave For Earthquake Resistant Design, S. Nakamura, I. Suetomi
Prediction Of Characteristics Of Surface Wave For Earthquake Resistant Design, S. Nakamura, I. Suetomi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Surface waves are not considered directly in the current earthquake resistant design code of the underground lineal structure, because a method for estimating the surface wave as input motion is not established. A procedure for calculating the expected value of peak ground displacement from bedrock motion is presented in this paper; the bedrock motion is converted to Love Nave spectra by the method proposed by the authors, and Love wave spectra is converted to peak ground displacement by the method proposed newly in this paper. Input motions of the underground transmission line is estimated as an example case to compare …
Seismic Risk Analysis For A Site Along The Gorda Segment Of The Cascadia Subduction Zone, Ronald C. Chaney, Guy Conversano, Gary Carver, David N. Lindberg, Frank Bickner
Seismic Risk Analysis For A Site Along The Gorda Segment Of The Cascadia Subduction Zone, Ronald C. Chaney, Guy Conversano, Gary Carver, David N. Lindberg, Frank Bickner
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A seismic risk evaluation was conducted on a site near Eureka, California. The site was subject to potential earthquake loading from a number of sources. These sources were: (1) Mendocino Fracture Zone, (2) Gorda Segment of the Cascadia Subduction Zone, (3) Little Salmon thrust fault under the site, (4) Mad River Fault Zone, and (5) Intra plate west - Gorda Plate. The geology of thrust faults in Northern California is examined along with that of the Mendocino Fracture Zone, and the southern section (Gorda Segment) of the Cascadia subduction zone. A trench log showing a splay of the Little Salmon …
Subsurface Conditions In Memphis And Shelby County, Tennessee, T. S. Chang, K. W. Ng, H. Hwang, C. S. Lee
Subsurface Conditions In Memphis And Shelby County, Tennessee, T. S. Chang, K. W. Ng, H. Hwang, C. S. Lee
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Investigation of subsurface conditions in the Memphis and Shelby County area, located within 100 miles south of the New Madrid seismic zone, was conducted by studying the soil data of more than 8,500 boring logs in the study area. These soil boring logs were collected from government agencies and private geotechnical companies so that the overall subsurface investigation was feasible and affordable. The subsurface conditions were presented in the standardized format of representative soil logs in accordance with a grid system applied to the study area. The results of the subsurface investigation are essential for regional seismic study such as …
Array Processing Of Rayleigh Waves For Shear Structure, T. G. Barker, J. L. Stevens
Array Processing Of Rayleigh Waves For Shear Structure, T. G. Barker, J. L. Stevens
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Site response to earthquakes is strongly dependent on shallow shear wave velocity structure β(z), and evidence suggests that soil strength and liquefaction potential depends on it as well. We have determined β(z) at several sites by inversion of dispersion data from Rayleigh waves recorded on linear arrays of geophones using artificial sources. Improved methods have been developed for extracting phase and group velocities that lead to significantly more stable and accurate inversion results.
Session 10: Discussions And Replies, Multiple Authors
Session 10: Discussions And Replies, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Dispersion Characteristics Of Elastic Waves In Saturated Soils, Shiming Wu, Longzhu Chen
Dispersion Characteristics Of Elastic Waves In Saturated Soils, Shiming Wu, Longzhu Chen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Based on the wave equations established by the authors, the dispersion characteristics of elastic waves in saturated soils are analyzed and verified by laboratory test and seismic survey in the field. The results can be used for determination of physical and mechanical parameters of saturated soils, such as, Poisson's ratio, depth for first appearance of full saturation, porosity and unit weight by measurement of wave velocities.
Generalized Rayleigh Waves In Layered Solid-Fluid Media, Hua Hui Tan
Generalized Rayleigh Waves In Layered Solid-Fluid Media, Hua Hui Tan
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A finite-element method for the propagation of Rayleigh-type waves in layered solid-fluid media is presented. The method uses displacement as the only parameter to describe the solid and the fluid motions. A penalty function method and a selective integration technique are employed to change the elastic coefficient matrix of fluid from singular to nonsingular. Results obtained from the proposed method agree well with those obtained from available analytical solutions. The method can be used to study the propagation of Rayleigh-type waves in a two-dimensional, irregular solid-fluid system.
Investigation Of Stress Waves Reflection Problems From A Free Surface By Dynamical Photoelasticity Method, I. Ch. Kostin
Investigation Of Stress Waves Reflection Problems From A Free Surface By Dynamical Photoelasticity Method, I. Ch. Kostin
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Leak Detection In Large Storage Tanks Using Seismic Boundary Waves, M. Kashi, K. Maser, A. Sotoodehnia
Leak Detection In Large Storage Tanks Using Seismic Boundary Waves, M. Kashi, K. Maser, A. Sotoodehnia
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper describes a field evaluation of a technique for detecting leaks in large above ground storage tanks. The technique detects leaking tank products in the foundation material by sensing anomalies in seismic boundary waves transmitted across the tank bottom. The evaluation consisted of three steps: (1) investigation of surface (Rayleigh) wave anomalies due to surface soil saturation in linear arrays; (2) evaluation of boundary waves propagated across the bottom of typical tanks; and (3) a surface (Rayleigh) wave experiment using tomography to locate velocity changes due to surface soil saturation. The results of these tests have shown that boundary …
Three Dimensional Wave Propagation Due To Pile Driving, S. Savidis, A. Mitakidis
Three Dimensional Wave Propagation Due To Pile Driving, S. Savidis, A. Mitakidis
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A very economical and efficient method to construct pile foundations or sheet walls is given by the driving of the pile itself in the case of prefabricated piles or of the steel-sheet pipe for concrete piles in situ and also by the driving of the sheet piles in the case of sheet walls. In spite of its efficiency this method underlies, because of environment protection reasons to certain restrictions that concern the influence of the produced shock waves during the driving procedure to neighboring buildings and constructions. For the theoretical calculation of this influence at first the free-field response of …
Use Of Rayleigh Modes In Interpretation Of Sasw Test, N. Gucunski, R. D. Woods
Use Of Rayleigh Modes In Interpretation Of Sasw Test, N. Gucunski, R. D. Woods
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The Spectral-Analysis-of-Surface-Waves (SASW) method is a seismic method for measuring in situ elastic moduli of layered systems, like soils or pavements. The inversion process associated with SASW can be an ambiguous task in certain cases, because a field dispersion curve needs to be matched with an unknown path through a family of theoretically defined curves for an assumed profile. A study of the influence of soil stratification on participation of higher Rayleigh modes in surface wave propagation included the evaluation of theoretical dispersion curves, modal shapes and rates of energy transmission in the horizontal direction. Wave propagation due to oscillations …
Current Trends In Design And Analysis Of Paper Machine Foundations, Alex Sy, W. E. Mckevitt
Current Trends In Design And Analysis Of Paper Machine Foundations, Alex Sy, W. E. Mckevitt
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Current trends in the design and dynamic analysis of paper machine foundations to ensure satisfactory performance are presented in this paper. Space frame foundations for modern high speed paper machines are governed by the requirements to meet stringent alignment/deflection tolerances and dynamic stiffness requirements specified by the machine manufacturer. The current design approach considers the complete machine-foundation-soil interaction. The dynamic response analysis is commonly conducted using a suitable finite element computer code in which the soil is modelled by equivalent springs. Damping is also included in the response calculation. Appropriate stiffness and damping parameters to model the foundation soil or …
Damage Criteria For Small Amplitude Ground Vibrations, K. Rainer Massarsch, Bengt B. Broms
Damage Criteria For Small Amplitude Ground Vibrations, K. Rainer Massarsch, Bengt B. Broms
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
European codes and recommendations have been reviewed with respect to critical vibration levels, causing damage to buildings. It was found that the variation of the vibration threshold levels was large between the different codes. A rational approach to assess the damage caused by ground vibrations is proposed, based on wave propagation theory. The wave length appears to be the most important parameter. The damage potential was found to be greatest when the length of the propagating wave is equal to or shorter than the length of the building. The wave length can be determined from the frequency and wave propagation …
Session 11: Discussions And Replies, Multiple Authors
Session 11: Discussions And Replies, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Dynamic Characteristics Of Crusher Supporting Structures, P. Srinivasulu, B. Sivarama Sarma, N. Lakshmanan
Dynamic Characteristics Of Crusher Supporting Structures, P. Srinivasulu, B. Sivarama Sarma, N. Lakshmanan
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Ring granulator type crushers are installed in many coal handling plants over framed type supporting structures either in steel or reinforced concrete. The causes of excessive vibrations commonly reported from these installations are discussed. The paper describes, in particular, the nature and magnitudes of exciting forces to be considered for the safe design of supporting structures for such machinery. Two practical examples are illustrated - one involving an elevated steel structure and another reinforced concrete framed structure, the latter supporting multiple crushers on the same floor. Pertinent conclusions are drawn for the benefit of future designers of such installations.
Dynamic Characteristics Of Soils In Calculation Of Vibrations Of Foundations For Machines With Periodical, Pulse And Random Loads, Vadim M. Platesky
Dynamic Characteristics Of Soils In Calculation Of Vibrations Of Foundations For Machines With Periodical, Pulse And Random Loads, Vadim M. Platesky
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The paper deals with the results of the exper1mental studies performed by the author on the foundations 0.5, 2.4 and 25 sq. m in area under periodical, Pulse and random dynamic loads. Some formulas are given to determine dynamic characteristics of soils. Methods and devices for field dynamic tests of soils are described. The results of the proposed relationship check are given.
Dynamic Considerations In The Design Of Paper Machine Foundations, J. P. Lee
Dynamic Considerations In The Design Of Paper Machine Foundations, J. P. Lee
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The design of modern paper machine foundation should consider machine frame supporting foundation and underlying soil as an integrated system. For smooth operation of the machine, quality of paper and economic reasons, a dynamic analysis of the machine system should be performed. This paper discusses three most important factors in the dynamic analysis of a paper machine: (1) Soil-structure interaction effect, (2) frequency analysis, and (3) force-response analysis.
Ground Vibration Isolated By Silo And Pile Barriers, Xian-Jian Yang
Ground Vibration Isolated By Silo And Pile Barriers, Xian-Jian Yang
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Based on the model, field test and theory research, this paper puts forward the design method of ground vibration isolated by silo and pita barriers, the practical engineering calculation and the remained problems in this respect. It is pointed out that although the diameter of pile is much smaller than that L/δ shielded wave length (Woods 1978), the ground wave motion can be effectively shielded so long as the proper pile distance is to be selected. This makes it possible that the silo and pile (as well as the pile of other form and material) barriers can be used in …
Ground Vibration Isolation Using Gas Cushions, K. Rainer Massarsch
Ground Vibration Isolation Using Gas Cushions, K. Rainer Massarsch
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A new ground vibration isolation method is described, which uses inflated, flexible cushions. The isolation cushions have therefore a low impedance and act as vibration reflectors in the ground. Practical aspects, such as the production of the gas cushions screen, the installation method and the gas-tightness of the gas cushions are discussed. The screen can be installed to great depth, using the well-proven slurry trench technique. After installation, the trench is filled with a self-hardening cement-bentonite grout, which creates a plastic, water-tight protection layer around the cushions and assures the long term stability of the screen. The gas cushion screen …
Integrated Analysis Of Turbomachinery Frame-Foundation-Soil Interaction, Madhira R. Madhav, N. G. R. Iyengar, S. Kathiroli
Integrated Analysis Of Turbomachinery Frame-Foundation-Soil Interaction, Madhira R. Madhav, N. G. R. Iyengar, S. Kathiroli
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
For the smooth functioning of turbomachines, the design of the rotor, the bearings, the supporting structure, and the foundation should be carried out as an integrated system. The frequency domain method in conjunction with FEM is chosen for the analysis. The modified influence matrix boundary condition method is applied to reduce the number of equations to be solved. Results for 4 idealized cases are compared. It is shown that the interaction effects are significant in the lowest frequency domain.
Pile Driving Analysis: Two-Phase Finite Element Approach, P. Hölscher
Pile Driving Analysis: Two-Phase Finite Element Approach, P. Hölscher
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The pile-driving process is analysed using the dynamic finite element program SATURN. The soil is modelled as a two-phase (skeleton and water) axi-symmetric continuum. The elasto-plastic behaviour of the skeleton is considered. Energy dissipation due to radiation, plastic deformation and water-skeleton friction is taken into account. The importance of permeability of the soil, its strength and its dilatancy are outlined. The soil resistance under the toe is strongly influenced by the low compressibility of the water. The results of the simulations show that the non-linear soil behaviour around the pile toe cannot be simulated satisfactorily using a single phase material. …
Pile Driving Criteria For Construction Near An Historic Dam, L. P. Jedele
Pile Driving Criteria For Construction Near An Historic Dam, L. P. Jedele
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The construction of a new road included a bridge crossing a river. The location of the bridge crossing was about 300 feet (91.5 meters) downstream from an historic dam. Prior to construction, concerns were raised about vibrations which might be generated from construction activities, especially pile driving for the new bridge abutments, and their potential effect on the integrity of the dam. As a result, a vibration study was conducted on the dam, prior to construction, to assess the vibrations generated from normal operation of the dam and from a simulated pile driving operation. Based on the simulated pile driving …
Predicting Vibrations Of Soil And Buildings Excited By Machine Foundations Under Dynamic Loads, Mark Svinkin
Predicting Vibrations Of Soil And Buildings Excited By Machine Foundations Under Dynamic Loads, Mark Svinkin
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents a new method that predicts the vibrational effects on existing soil, building and equipment from a designed machine foundation when it will be installed at a specific site. The method requires development of certain experimental data at an industrial site and subsequent computerized data reduction. The results are complete vibro-records at the locations of interest. The basic prerequisite of the suggested method is an experimental determining of impulse responses of soil and structures. The use of this response gives to an engineer a chance to consider heterogeneity and multiformity of soil properties. The accepted assumptions have been …
Prediction Of Vibrations Of Footings For Highly Sensitive Devices, Werner Palloks, Werner Heidrich, Stephan Achilles
Prediction Of Vibrations Of Footings For Highly Sensitive Devices, Werner Palloks, Werner Heidrich, Stephan Achilles
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
When planning foundations for devices sensitive to vibrations the planned location should be investigated for vibrations. These investigations have to include the existing sources in the vicinity as for instance street or rail traffic as well as exciting devices to be installed at the same building site like compressor stations or other machines. The present paper shows a procedure to estimate the vibrations at the planned locations for sensitive devices. The procedure includes investigations of the dynamic soil properties, the decrease of the vibrations with distance, and the transfer functions of rigid footings. It takes into consideration stochastic excitation as …
Simple Design Methods For Vibration Isolation By Wave Barriers, Tahmeed M. Ai-Hussaini, Shahid Ahmad
Simple Design Methods For Vibration Isolation By Wave Barriers, Tahmeed M. Ai-Hussaini, Shahid Ahmad
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Rectangular wave barriers (open or infilled trenches) are frequently used in engineering practice to reduce the ground vibrations caused by propagating surface (Rayleigh) waves of relatively small wave lengths. This paper presents models involving simple algebraic formulas for the design of rectangular wave barriers in homogeneous soil deposits. Both vertical and horizontal ground vibrations are considered. An extensive parametric investigation was conducted using a direct boundary element method algorithm. Simple models based on the key dimensionless parameters that control the vibration screening effectiveness were then developed. The utility of such models is established through comparisons with rigorous numerical solutions and …
Turbogenerator Foundation Analysis Under Wide-Range (Seismic In Particular) Excitation, Igor Andrianov, Vladimir Sedin
Turbogenerator Foundation Analysis Under Wide-Range (Seismic In Particular) Excitation, Igor Andrianov, Vladimir Sedin
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Dynamics of turbogenerator foundation under wide-range (seismic in particular) excitation is being investigated. It is rather simple to get a solution for low- and high- frequency vibrations in case of a ribbed plate resting on elastic subgrade. As for practical purposes, it is a solution for intermediate parameter values that is of solution. It is shown here that the difficulties could be overcome by two-point fade-approximant method.