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Full-Text Articles in Geotechnical Engineering
Session 7: Moderator's Report, W. F. Marcuson Iii
Session 7: Moderator's Report, W. F. Marcuson Iii
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Measurements Of Lnsitu Pore Water Pressures During Earthquakes, K. Ishihara
Measurements Of Lnsitu Pore Water Pressures During Earthquakes, K. Ishihara
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
By installing several sets of piezometers and a seismograph in a recently reclaimed sand deposit on Ohgishima Island near Tokyo, Japan, an attempt was made to monitor pore water pressures as well as horizontal accelerations during earthquakes. The limited data obtained thus far have indicated that virtually no pore water could build up in the loose sand deposit with a small scale shaking having a maximum horizontal acceleration of 45 gal on the ground surface.
Zonation Of Central U. S. Earthquake Sources, G. L. Hempen, M. J. Klosterman, B. H. Moore, John D. Rockaway, Gerald B. Rupert
Zonation Of Central U. S. Earthquake Sources, G. L. Hempen, M. J. Klosterman, B. H. Moore, John D. Rockaway, Gerald B. Rupert
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A variety of analyses are utilized in developing potential earthquake ground shaking at a specific location. Geological procedures for estimating causes of earthquakes are fundamental to the prediction of ground motions. Evaluations of geologic factors compliment mathematical assessments of seismological data. Earthquake potential in the Central United States is predicted using the concept of seismic source zones due to the difficulty of determining active faults. Resolution of these geographic source zones is dependent upon knowledge of historic seismicity, pertinent geologic features, and causative tectonics. Regardless of the method used to delineate source zones, these zones must be geologically and seismologically …
Session 9: Moderator's Report, Umesh Chandra
Session 9: Moderator's Report, Umesh Chandra
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Session 9: Closing Remarks, T. Kuppusamy
Session 9: Closing Remarks, T. Kuppusamy
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Dynamically Coupled Percolation And Deformation Analysis Of Earth Dams, Z. J. Shen
Dynamically Coupled Percolation And Deformation Analysis Of Earth Dams, Z. J. Shen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
An effective stress method using two-dimensional finite elements is presented for predicting the generation and dissipation of pore water pressure coupled with deformation in saturated sands under earthquake shaking. The method has been used to analyze the post-earthquake slide of upstream slope of Shimenling earth dam in Liaoning province during Haicheng earthquake on Feb. 4, 1975.
Physical Modeling To Assess The Dynamic Behavior Of Rock Slopes, J. A. Wilson
Physical Modeling To Assess The Dynamic Behavior Of Rock Slopes, J. A. Wilson
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The design of rock slopes in seismically active areas should consider the risk of earthquake loads. This study involved testing simple models of rock slopes on a hydraulic shaking table and displaying the results on time versus displacement curves. The results were compared with predicted displacements computed using equations available in the literature. At low frequencies and small amplitudes the predicted sliding rates compared very well with the rates observed during the testing. However as the frequencies and amplitudes were increased, the equations overestimated the displacements by gradually increasing amounts.
Design Measures To Improve Performance Of Fill Dams Under Earthquake Loading, K. L. Logani
Design Measures To Improve Performance Of Fill Dams Under Earthquake Loading, K. L. Logani
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Fill dams of height 50 meters or more are increasingly being planned, designed and constructed in highly seismic areas of the world. These dams incorporate various earthquake design measures. The design measures have been critically examined. Design guides with respect to free board, core base width, crest width, type and material of core and material of shells have been reviewed. Some examples of actual changes made in the design, for the seismicity of the region have been given (Table II). Finally, a table of pertinent data of over 50 high dams located in highly seismic areas of the world is …
Dynamic Properties Of Embankment Dams, M. Öner, M. Erdik
Dynamic Properties Of Embankment Dams, M. Öner, M. Erdik
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Forced vibration test result are presented for two large embankment dams. The results are compared with an approximately three dimensional finite element analysis. In addition a semi-empirical fundamental period expression is developed for use in the interpretation of the available natural period data. The period expression developed is based on the shear wedge solution for an inhomogeneous medium and takes the effect of the third dimension into account.
Rockfill Dam Stability Problems In A Seismic Zone, A. Moroianu, V. Perlea
Rockfill Dam Stability Problems In A Seismic Zone, A. Moroianu, V. Perlea
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In the close vicinity of the great shock, March 4, 1977, in Vrancea region, Romania, one of the biggest shocks felt recently in Europe, two rockfill dams 120 m and, respectively, 70 m high with clayey cores are being constructed. In the paper, some problems arised by the design of these dams from earthquake engineering point of view are presented.
No Tension Approach To Define Failure Phenomena For Rockfill Dam Subjected To Earthquake Loading, K. G. Bhatia, R. Natarajan
No Tension Approach To Define Failure Phenomena For Rockfill Dam Subjected To Earthquake Loading, K. G. Bhatia, R. Natarajan
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
It has been observed that actual behavior of Rockfill dams during earthquake is much different than that obtained by elastic analysis. No tension approach has thus been developed to overcome the shortfalls of elastic analysis. Using no tension approach redistribution of stresses are obtained which help in defining the failure pattern of the dam' subjected to a given seismic acceleration or in other words the failure acceleration is obtained for a given dam subjected to earthquake forces. Various dam models having different upstream and downstream slopes are analyzed using finite element technique. The input earthquake motion has been considered as …
Seismic Stability Indices Of Earth Structure, M. P. Singh
Seismic Stability Indices Of Earth Structure, M. P. Singh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Indices like cyclic damage and factor of safety are often used to quantify stability of soil systems subjected to earthquake loads. The methods used to obtain these indices are described; the relationship between cyclic damage and factor of safety through the concept of uniform stress equivalent time history is explored. For evaluation of a soil system design, the use of a direct approach is proposed. Evaluation of this approach by a simulation study is outlined. This approach, can use response spectra directly as seismic design input, and it provides an acceptable procedure for seismic stability prediction of soil systems.
Embankment Design In Seismic Areas — Indian Practice, K. C. Thomas, S. N. Guru Rau, Bikram B. Raj
Embankment Design In Seismic Areas — Indian Practice, K. C. Thomas, S. N. Guru Rau, Bikram B. Raj
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A number of river valley projects for the development of water and power resources, particularly in the Northern and North Eastern part of India, lie on the foothills of Himalayas which is seismically active. In the developmental activity of dam building, aseismic design of dam is therefore recognized and adopted. The paper presents the current Indian practice in the aseismic design of embankment dams with illustrations from studies carried out on some recent dams.
Evaluation Of Seismic Stability Of Foundation Soils Under Revelstoke Earthfill Dam, K. S. Khilnani, P. M. Byrne
Evaluation Of Seismic Stability Of Foundation Soils Under Revelstoke Earthfill Dam, K. S. Khilnani, P. M. Byrne
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The stability of the fine sands underlying the shells of the Revelstoke earthfill dam under earthquake shaking is discussed. The evaluation of liquefaction potential of the deposit was made from the field standard penetration resistance of the material. The dynamic analysis, made by a one-dimensional equivalent visco-elastic method, indicated that the sand under both the upstream and downstream shells had adequate liquefaction resistance and could be left in place. Adequate drainage of downstream fine sands was provided to further reduce its liquefaction potential.
Earthquake-Resistant Design Of Earth Dams, H. Bolton Seed
Earthquake-Resistant Design Of Earth Dams, H. Bolton Seed
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Lessons gained from observations of the field performance of earth darns during earthquakes are reviewed and used to illustrate the primary problems of concern. Defensive design measures which may be taken to mitigate the various hazards are reviewed and illustrated. Analytical approaches for evaluating seismic stability and the deformations of earth darns during earthquakes are discussed, together with recent developments which facilitate their implementation in special cases; situations which require careful consideration of special effects such as the three-dimensionality of the dam-valley system and pore pressure re-distribution following an earthquake are discussed and illustrated.
Mechanism Of Surface Faulting And Its Seismic Effect, Zhong-Qi Wang, Shu-Tung Zhao, Zheng-Lu Huang
Mechanism Of Surface Faulting And Its Seismic Effect, Zhong-Qi Wang, Shu-Tung Zhao, Zheng-Lu Huang
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The mechanism and reoccurrence rule of surface faulting have been analyzed based on macroscopic inspection and testing in the background of Tangshan earthquake 1976 and other events. It has been proved that such surface faulting bas only limited effect on surface structures nearby. And most of the surface ruptures in soil layer occurred in most earthquake zones are not the causative faults from focus up to the ground surface. Thus its seismic effect should be reestimated.
Improvement Of Characteristics Of A Liquefiable Soil Deposit By Pile Driving Operations, M. Iyengar
Improvement Of Characteristics Of A Liquefiable Soil Deposit By Pile Driving Operations, M. Iyengar
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Large scale failures of pile foundations driven in liquefiable soil deposits have been reported during the 1964 Alaska and Nighaata Earthquakes. Where the subsoil did not liquefy, the piles did not fail. These conclusions were the basis of selection of a proper pile type for the Bonoaigaon Complex wherein it was intended that the pile installation procedure shall also adequately densify the loose saturated sandy and silty subsoils prone to liquefaction during expected earthquakes at site. Studies were carried out to assess soil characteristics before and after piling and the resulting improvement in the subsoil. It is concluded that the …
Wave Propagation At The Surface Of Clay Deposits Due To Vertical Impact, G. Lefebvre, M. Veber, J. G. Beliveau
Wave Propagation At The Surface Of Clay Deposits Due To Vertical Impact, G. Lefebvre, M. Veber, J. G. Beliveau
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In a study of wave propagation at the surface of soft and sensitive clay deposits, particle velocities were measured at live sites of Champlain clay deposits in the province-of Quebec. Surface excitation was provided by the free fall of a mass and the measurements were obtained at different distances from the source at ground level and shallow depths. The major portion of the energy appears to be in the form of Rayleigh waves. Attention is focused on the effects of site parameters and in particular the depth of water table on the level of amplitude and the attenuation coefficient. As …
Poor Water Pressure Rises During Earthquakes, K. Ishihara
Poor Water Pressure Rises During Earthquakes, K. Ishihara
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A set of piezometers were embedded in sand deposits on a reclaimed island in Tokyo Bay and a seismograph was placed on the ground surface nearby in order to monitor insitu pore water pressures simultaneously with the horizontal accelerations during earthquakes. During the September 25, 1980 earthquake, the instruments registered increases of pore water pressures corresponding to 19% and 16 % of the effective confining pressure at depths of 6.0 m and 14.0 m, respectively. At the same time, a maximum horizontal acceleration of 95 gal was registered at the ground surface.
Electrical Characterization Of Soil For In-Situ Measurement Of Liquefaction Potential, K. Arulanandan, S. J. Harvey, J. S. Chak
Electrical Characterization Of Soil For In-Situ Measurement Of Liquefaction Potential, K. Arulanandan, S. J. Harvey, J. S. Chak
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A new method for characterizing the fundamental sand properties with electrical parameters is described. Correlations are established between the electrical parameters and relative density, Dr, cyclic stress ratio, τ/ σ'0, and the parameter K2max. An electrical probe, used to measure the electrical parameters in situ, is described. Field measurements, taken with the probe at one of the 1906 San Francisco earthquake sites, indicate that this is a viable alternative for the in situ evaluation of liquefaction potential.
Campano-Lucano Earthquake, November 1980, Italy, Strong Motion Data Related To Local Site Conditions, A. Fels, A. Pugliese, F. Muzzi
Campano-Lucano Earthquake, November 1980, Italy, Strong Motion Data Related To Local Site Conditions, A. Fels, A. Pugliese, F. Muzzi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
When the 23 November 1980 earthquake struck the south of Italy a network of strong motion recorders was in operation. The earthquake triggered 21 stations. The network is composed by 168 stations spread all over the country following statistical criterion, see Taccarino and Zaffiro, 1973. The paper presents the results of the records obtained at 6 of 21 stations together with the available geological information of the sites where the stations were located.
Session 8: Final Comments By Moderator, K. Arulanandan
Session 8: Final Comments By Moderator, K. Arulanandan
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Seismic Response Of Subsurface Ground With Use Of Measured Underground Acceleration, T. Iwasaki, K. Kawashima, Y. Takagi
Seismic Response Of Subsurface Ground With Use Of Measured Underground Acceleration, T. Iwasaki, K. Kawashima, Y. Takagi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The seismic response of subsurface ground is investigated based on the measured underground acceleration records at three sites around the Tokyo Bay induced by several moderate earthquakes, Variations of maximum accelerations with respect to depth are described in both horizontal and vertical components, and Amplification of acceleration in underground is presented in terms of frequency response function, Correlations of the underground accelerations between theoretical calculation and actual records are also discussed.
Different Magnitude-Epicentral Intensity Relations And Estimation Of Maximum Ground Acceleration, U. Chandra
Different Magnitude-Epicentral Intensity Relations And Estimation Of Maximum Ground Acceleration, U. Chandra
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
For an earthquake of magnitude 7.0 or larger, different published relations between magnitude, M, and epicentral intensity, I0, yield I0 values which may differ from each other by as much as one intensity unit or more. This implies an uncertainty of a factor of about 2 in the estimation of maximum ground acceleration. New empirical relations between M and I0 are derived using the revised estimates of I0 for several earthquakes. Suitability of some of the commonly used M - I0 relations for the estimation of maximum ground acceleration is examined by deriving acceleration-distance curves for …
Analysis Of Stresses In Seismically Induced Shallow Slope Failures, Luis E. Vallejo, Lawrence M. Peszek
Analysis Of Stresses In Seismically Induced Shallow Slope Failures, Luis E. Vallejo, Lawrence M. Peszek
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
An analysis of the stresses induced by a combination of static and seismic forces on the failure surface of shallow soil slope instabilities is presented. The geometry of the failures, either shallow planar of finite length or shallow rotational, is taken into consideration in the analysis. The stress induced by a combination of the above forces is found to be greater for the planar than for the rotational ones. Therefore, at limit equilibrium conditions, the former will predominate. Field measurements of the geometry of shallow soil slope failures corroborate the theoretical findings.
Discussion On "Zonation Of Central U.S. Earthquake Sources" By G. L. Hempen, Dinesh C. Gupta
Discussion On "Zonation Of Central U.S. Earthquake Sources" By G. L. Hempen, Dinesh C. Gupta
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Discussions, Umesh Chandra
Discussions, Umesh Chandra
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Program Of The Conference, Multiple Authors
Program Of The Conference, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Opening Remarks, Shamsher Prakash
Opening Remarks, Shamsher Prakash
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.
Opening Ceremonies - Images, Multiple Authors
Opening Ceremonies - Images, Multiple Authors
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
No abstract provided.