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Articles 23371 - 23400 of 33650
Full-Text Articles in Entire DC Network
Displacements Of Slopes Under Earthquake Loading, L. J. L. Lemos, P. A. L. F. Coelho
Displacements Of Slopes Under Earthquake Loading, L. J. L. Lemos, P. A. L. F. Coelho
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The displacements and rates of displacement of slopes post-rupture are influenced by the dynamic response of soils. Pre-existing shear surfaces at or close to residual strength are frequently present in slopes of clay and weak mudstone, due to previous slope movement or tectonic disturbance. Knowledge of the strength of such surfaces under rapid loading is necessary of stability during and after an earthquake is to be examined. To obtain such data, high speed displacement controlled ring shear tests have been performed, on samples after being pre-sheared to residual conditions. With the results from those tests, suitable constitutive laws were derived …
Dynamic Response Analysis Of Ash-Retention Dam And Its Earthquake-Resistant Improvement, Nenghui Li, Jiamo Zhu, Zhujiang Shen
Dynamic Response Analysis Of Ash-Retention Dam And Its Earthquake-Resistant Improvement, Nenghui Li, Jiamo Zhu, Zhujiang Shen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A nonlinear stress-strain static evaluation model and an equivalent visco-elastic dynamic evaluation model, which can simulate well the static and seismic behaviors of the ash deposit, as well as the methods for analyzing the dynamic response and for improving the earthquake-resistance of the ash-retention dam are presented and illustrated through a practical engineering project in the paper.
Inelastic Seismic Response Of San Fernando And Santa Felicia Dams, Elsa Stara-Gazetas, Ricardo Dobry
Inelastic Seismic Response Of San Fernando And Santa Felicia Dams, Elsa Stara-Gazetas, Ricardo Dobry
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A simplified method of inelastic seismic analysis of earth dams developed by the authors is used to study the response of the San Fernando and Santa Felicia dams to accelerograms recorded in the 1971 San Fernando Earthquake. The method involves two separate stages. In stage I, the dam is discretized into finite elements and is subjected to horizontal static inertia-like forces; its nonlinear deformation is computed using a plane strain code, while the applied horizontal forces are gradually increased until large enough strains develop in most elements of the dam. The results of this analysis are utilized to derive realistic …
Measured And Calculated Dynamic Response Of Rock-Fill Dam, Lelio H. Mejia, Katherine Fung, David W. Sykora, Joseph P. Koester, Mary E. Hynes
Measured And Calculated Dynamic Response Of Rock-Fill Dam, Lelio H. Mejia, Katherine Fung, David W. Sykora, Joseph P. Koester, Mary E. Hynes
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The U.S. Army Corps of Engineers recently completed a seismic stability assessment of the Ririe Darn and Reservoir Project located near Idaho Falls, Idaho. Ririe Darn is an earth- and rockfill darn with a central impervious core constructed between 1966 and 1975 in a narrow canyon of Willow Creek. A geologic and seismologic study indicated that the controlling maximum credible earthquake (MCE} is a Magnitude 7.5 earthquake at a distance of 8 km from the darn. The seismic stability analysis included a dynamic response analysis of the darn using two-dimensional finite element procedures. Empirical relations derived from the observed response …
Modeling Of Observed Permanent Deformation At La Villita Dam, Mohamed Fadel Succarieh, Ahmed-Waeil M. Elgamal, Liping Yan
Modeling Of Observed Permanent Deformation At La Villita Dam, Mohamed Fadel Succarieh, Ahmed-Waeil M. Elgamal, Liping Yan
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The observed behavior of La Villita dam in Mexico during five different earthquakes which have occurred in the period 1975-1985 is analyzed. Asymmetry observed in the recorded crest acceleration time histories is interpreted to be due to localized stick-slip behavior below the recording instrument. Yield acceleration associated with each stick-slip event can be inferred directly from these crest records. Values of observed average yield accelerations for the November 15, 1975 and September 19, 1985 earthquakes are used to predict the observed horizontal displacements during these earthquakes. Response of other soil systems involving stick-slip deformations during dynamic loading is also briefly …
Response Of Earth Dam With Underground Concrete Cut-Off Wall, Wanhong Li, Wenshao Wang
Response Of Earth Dam With Underground Concrete Cut-Off Wall, Wanhong Li, Wenshao Wang
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The response of earth dam with underground concrete cut-off wall during construction, at normal operation and under earthquake action has been evaluated and some interesting research' results such as seismic permanent displacement are obtained. A new nonlinear dynamic model of cohesionless soils, consisting of unclosed hysteresis loop, moving back bone curve and static loading curve, is presented. Shear stress ratio controlled cyclic triaxial tests and ultrasonic shear wave velocity tests have been performed to measure the parameters of the model. The shear resistance at sand/concrete interface has been studied by making tests in a torsional shear testing device.
Response Of Earth Dams In Canyons Subjected To Asynchronous Base Excitation, Panos Dakoulas, Humayun Hashmi
Response Of Earth Dams In Canyons Subjected To Asynchronous Base Excitation, Panos Dakoulas, Humayun Hashmi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A mathematical solution is presented for steady-state lateral response of earth and rock fill dams in canyons subjected to asynchronous excitation consisting of obliquely incident SH waves. The dam is idealized with a 2-dimensional shear wedge and the canyon is considered rectangular and consisting of flexible rock. A parametric study is undertaken to investigate the influence of (a) the angle of incidence, (b) the impedance ratio and (c) the canyon narrowness on the steady-state response, by considering in a simplifying way the effects of the dam-canyon interaction. The results demonstrate that the above factors may have a significant effect on …
Seismic Stability Of Hillslopes In Greater Cincinnati Area, M. Zoghi, A. Bodocsi
Seismic Stability Of Hillslopes In Greater Cincinnati Area, M. Zoghi, A. Bodocsi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Slope stability problems involving colluvia on shale bedrock are common in the Greater Cincinnati Area. The behavior of these hillslopes during earthquakes is, however, not known. This gives cause to speculation whether they are vulnerable to earthquake vibrations. In order to verify the response of these slopes to earthquake induced ground motions, representative composite clay shale samples obtained from a typical colluvial hillside in Cincinnati were tested in a cyclic direct shear apparatus which was attached to a load cell from the MTS piston actuator. The samples were initially consolidated under a selected normal pressure and then sheared until residual …
The Study Of Xintan Landslide's Sterescopic Monitoring In The Changjiang River Three Gorges, Zhu Ruigeng, Lu Wenxing, Kia Yuanyou
The Study Of Xintan Landslide's Sterescopic Monitoring In The Changjiang River Three Gorges, Zhu Ruigeng, Lu Wenxing, Kia Yuanyou
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper emphatically introduces a new landslide’s stereoscopic monitoring system that was builded in Xintan slope after failed. The movement in the underground different level can be decided through monitoring of surface by the system. The system can provide a basis to master the slope gliding regulartion so that a new prediction method may be worked out in the future.
Attenuation Of Ground Vibration On Saturated Silt Clay And Rock Bases, Xian-Jian Yang
Attenuation Of Ground Vibration On Saturated Silt Clay And Rock Bases, Xian-Jian Yang
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
By actual measuring and theory analysis, this paper obtains the saturated water mass density and shear modulus of saturated soil , and also the major factor affecting near source attenuation by the mteration of soil skeleton and water , the later also being the major factor affecting far source attenuation. The paper inquiries into the affect of the depth of underground water on the wave propagation. For rock base, as the wave velocity of rock body wave is high and the body wave attenuation much faster than the surface wave does, so the near source attenuated generally faster than the …
Session 8: Discussions And Replies, Multiple Authors
Session 8: Discussions And Replies, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Dynamical Behavior Of A Slightly Alluvial Basin Due To Concentrated Turbulence, Takashi Nishigaki, Kensuke Baba
Dynamical Behavior Of A Slightly Alluvial Basin Due To Concentrated Turbulence, Takashi Nishigaki, Kensuke Baba
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper is concerned with theoretical analyses and numerical evaluations based on the wave propagation theory to find dynamic characteristics of an alluvial basin locally situated on a half spatial bedrock due to concentrated loadings on the free surface. The method presented herein is derived from the Aki and Larner's method by releasing the assumption of the repeated irregularities, so that the wave field having localized irregularities can be evaluated. The numerical analyses show that the amplification effects are obvious on the free surface inside the alluvial sediment and the subsurface structure influences the seismic behavior observed on the surface.
Session 8: Opening Remarks, Ricardo Dobry
Session 8: Opening Remarks, Ricardo Dobry
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Session 8: Co-Chairman's Report, John G. Anderson
Session 8: Co-Chairman's Report, John G. Anderson
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Site Amplification Effects In The Ubaye Valley (France): Measurements And Modeling, Denis Jongmans, Michel Campillo
Site Amplification Effects In The Ubaye Valley (France): Measurements And Modeling, Denis Jongmans, Michel Campillo
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Local soil conditions can yield to significant variations in ground motion generated by earthquakes. During the last two decades, these amplification effects have been observed by numerous authors for well-documented earthquakes. On the other hand, theoretical models and numerical techniques have been proposed to physically understand site effects. However, few comparisons have been made between observations and theoretical results for well-known 2D structures (sediment-filled valleys). The aim of this paper is to present a study of the response of a valley in the French Alps. The structure (Ubaye valley) was chosen for its moderate dimensions (500 meters wide and 65 …
Soil Amplification Based On Array Observation In Chiba, Japan, Lin Lu, Tsuneo Katayama, Fumio Yamazaki
Soil Amplification Based On Array Observation In Chiba, Japan, Lin Lu, Tsuneo Katayama, Fumio Yamazaki
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The amplification characteristics of earthquake ground motion were investigated based on the Chiba Array observation records. The amplification of peak acceleration occurred mostly at the top soft layer and is similar for the three ground motion components. The ensemble Fourier spectrum ratio and coherence function were calculated and the amplification can be clearly seen in them. The drop of the coherence function at natural frequencies was discussed. The Fourier spectrum ratio and coherence function were also obtained using the smoothing procedure and were compared with those of the ensemble. Microtremor was measured at 11 points corresponding to the location of …
A Novel Method For Synthesizing Acceleration Time History With Consideration Of Earthquake Environment, He Yang
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A new method for generating earthquake time histories compatible with the rock response spectrum as the result of seismic hazard analysis will be presented in this paper. It is suggested that the base bank, which is composed of recorded ground motions with different response spectrum characteristics, should be used to select the initial solution. And then, modifying it iteratively to match the target spectrum. In this way, the earthquake environment could be considered.
Application Of Fuzzy Set Theory In Option Of Response Spectra, Zhou Xiyuan, Su Jingyu
Application Of Fuzzy Set Theory In Option Of Response Spectra, Zhou Xiyuan, Su Jingyu
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In order to consider the fuzziness of seismic intensity indecated by zoning map and seismic code in seismic design of structure, an innovative method in option of design spectrum in consideration of fuzziness of regional seismic hazard and site condition is presented herein. The solution of the problem can be divided into two steps: 1. to define and establish a fuzzy set for predicting and judging regional seismic hazard and site condition by applying fuzzy mathematics; 2. further to find out fuzzy vector of design spectrum depending on the fuzzy set of regional seismic hazard and site condition by applying …
Session 9: Discussions And Replies, Multiple Authors
Session 9: Discussions And Replies, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
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, …
Geotechnical Units And The Damages Caused By Earthquakes In Valparaiso - Chile, P. Acevedo, J. Monge, M. Astroza
Geotechnical Units And The Damages Caused By Earthquakes In Valparaiso - Chile, P. Acevedo, J. Monge, M. Astroza
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The geotechnical units forming the foundation soil of Valparaiso city and constituting seven zones that exhibit different stratigraphic sequences are characterized. In addition, the evolution of the artificial backfilling’s located in the seaport is reported. The damages causes by Chile Earthquake of March 3, 1985 allow to establish for each zone the MSK intensities, which are varying between 7 1/2 and 8 1/2 in the flat-ground sector of Valparaiso, and between 7 1/4 and 7 1/2 in the hills. The major intensity in the flat sector is observed in areas whose artificial backfilling’s are exhibiting greater thickness and less consistency …
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 …
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.
Impact Response Of Granular Soils, C. J. Poran, J. A. Rodriguez, K. S. Heh
Impact Response Of Granular Soils, C. J. Poran, J. A. Rodriguez, K. S. Heh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The paper describes results from an extensive experimental model study of response of dry sand to impact of a rigid pounder. In the laboratory tests a circular steel pounder was repeatedly dropped on sand contained in a large tank. Measurements included pounder acceleration and soil pressure at impact, pounder settlement, and soil densities and strains. Effects of pounder drop height, weight and contact area were investigated. A method is presented for the evaluation of global dynamic stiffness of the so1l mass affected by the impact by calculating a dynamic settlement modulus (DSM). The DSM values are determined from integration of …
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 …
Soil Profiling By Spectral Analysis Of Surface Waves, T. Satoh, K. Yamagata, C. J. Poran, J. A. Rodriguez
Soil Profiling By Spectral Analysis Of Surface Waves, T. Satoh, K. Yamagata, C. J. Poran, J. A. Rodriguez
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Methods for in-situ surface measurement and spectral analysis of Rayleigh waves for subsurface soil investigation have been tried by several researchers in recent years. The two most common methods, steady-state Rayleigh-wave and spectral-analysis-of-surface-waves (SASW) have certain disadvantages and are not used for routine soil investigation. The paper presents a system which uses a controlled vibration source with amplitude modulation and variable frequency capabilities. The electromagnetic vibrator may be varied in size and weight according to the depth of the soil strata investigated. The Rayleigh wave phase velocity dispersion curves are used to compute apparent velocity distribution in depth. An approximate …
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 …