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A Variational Formulation For Classical Models Of The Slope Stability With Earthquake Effect, Petr Koudelka, Petr Procházka Mar 1991

A Variational Formulation For Classical Models Of The Slope Stability With Earthquake Effect, Petr Koudelka, Petr Procházka

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

The paper deals with an extension of application of the Method of Apriori Integration to a model of a general slope, which is partly homogeneous and which is loaded also by the earthquake effect. The most dangerous direction of the power effect of the vibration is shown and for this direction the change of safety factor is discussed. The effect of reduced shear strength is included.

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Assessment Of Dynamic Properties Of Wushantou Dam, J. C. Chern, M. T. Wang, T. S. Lee Mar 1991

Assessment Of Dynamic Properties Of Wushantou Dam, J. C. Chern, M. T. Wang, T. S. Lee

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

Accurate assessment of material properties is essential for a meaningful evaluation of the dynamic behavior of a dam. Comprehensive studies using in- situ measurement and laboratory testing techniques coupled with back calculations of dam responses in recorded motion gives the following conclusions : (1) Response in good agreement with actual motion can be obtained by using appropriate analytical models and material properties; (2) a laboratory test may give reasonable result, but allowance should be made for the effects of strain level, sample disturbance and reconsolidation, especially in loose, non - cohesive soil; (3) in- situ shear wave velocity measurement is …

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Assessment Of Seismic Stability Of Dolphin Pool Slope Of John Hart Dam, J. K. Lou, P. M. Byrne, S. J. Garner, W. F. Marcuson Iii Mar 1991

Assessment Of Seismic Stability Of Dolphin Pool Slope Of John Hart Dam, J. K. Lou, P. M. Byrne, S. J. Garner, W. F. Marcuson Iii

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

The John Hart Dam is in a high seismic risk area. To ensure dam safety, the Dolphin Pool Slope portion of the dam had to be rebuilt. Extensive field investigations and laboratory testing were conducted to obtain representative soil strength parameters for seismic stability analyses and rehabilitation design. Back analysis of the performance of the Dolphin Pool Slope under a 1946 earthquake loading confirmed the strength parameters determined from the field investigation and laboratory testing. Seismic analyses indicated that large zones of the dam could be expected to liquefy under the Maximum Credible Earthquake and, because of uncertainties regarding the …

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Automated Slope Stability Analysis Of Zoned Dams, P. K. Basudnar, Yudhbir Dhawan, R. K. Dhawan Mar 1991

Automated Slope Stability Analysis Of Zoned Dams, P. K. Basudnar, Yudhbir Dhawan, R. K. Dhawan

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

The study pertains to the pseudo-static stability analysis of zoned dams with geologic discontinuities in the foundation. Sequential unconstrained minimization technique in conjunction with Janbu's generalized procedure of slices has been used for finding the critical slip surface and the corresponding minimum factor of safety. The method has been found to be quite efficient in solving such problems.

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Comparison Of 2-D And 3-D Dynamic Analysis Of Effective Stress Of Earth Dams, Xhou Jian, Zeng Guoxi, Wu Shiming Mar 1991

Comparison Of 2-D And 3-D Dynamic Analysis Of Effective Stress Of Earth Dams, Xhou Jian, Zeng Guoxi, Wu Shiming

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

Presented in this paper is a comparison between the results of 2-D and 3-D dynamic effective stress analyses of a hypothetical earth dam and two real tailing dams. The study is based on a method of rigorous nonlinear dynamic analysis by taking account the interaction of the fluid and soil phase of the material.

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Session 7: Concluding Remarks, Panos Dakoulas Mar 1991

Session 7: Concluding Remarks, Panos Dakoulas

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

No abstract provided.

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Consideration Of Earthquake Damage To Earth Dam For Irrigation In Japan, Shigeru Tani Mar 1991

Consideration Of Earthquake Damage To Earth Dam For Irrigation In Japan, Shigeru Tani

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

There are many small earth dams for irrigation called "TAMEIKE" in Japan, Most of them were constructed before modern soil engineering were established on the basis of empirical techniques. Earthquakes in the past gave much damage to these earth dams. This paper surveys damage of earthquake for those remaining on records again, and as for Nipponkai-Chubu Earthquake, detailed investigations such as in-situ test, laboratory test, analysis were made to clarify causes of the damage to earth dams. From the result of survey, the following matters were found; i.e., large damages occur at a high rate on earth dams whose foundation …

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Session 7: Discussions And Replies, Multiple Authors Mar 1991

Session 7: Discussions And Replies, Multiple Authors

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

No abstract provided.

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Displacements Of Slopes Under Earthquake Loading, L. J. L. Lemos, P. A. L. F. Coelho Mar 1991

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 …

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Dynamic Response Analysis Of Ash-Retention Dam And Its Earthquake-Resistant Improvement, Nenghui Li, Jiamo Zhu, Zhujiang Shen Mar 1991

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.

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Inelastic Seismic Response Of San Fernando And Santa Felicia Dams, Elsa Stara-Gazetas, Ricardo Dobry Mar 1991

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 …

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Measured And Calculated Dynamic Response Of Rock-Fill Dam, Lelio H. Mejia, Katherine Fung, David W. Sykora, Joseph P. Koester, Mary E. Hynes Mar 1991

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 …

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Modeling Of Observed Permanent Deformation At La Villita Dam, Mohamed Fadel Succarieh, Ahmed-Waeil M. Elgamal, Liping Yan Mar 1991

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 …

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Response Of Earth Dam With Underground Concrete Cut-Off Wall, Wanhong Li, Wenshao Wang Mar 1991

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.

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Response Of Earth Dams In Canyons Subjected To Asynchronous Base Excitation, Panos Dakoulas, Humayun Hashmi Mar 1991

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 …

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Seismic Stability Of Hillslopes In Greater Cincinnati Area, M. Zoghi, A. Bodocsi Mar 1991

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 …

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The Study Of Xintan Landslide's Sterescopic Monitoring In The Changjiang River Three Gorges, Zhu Ruigeng, Lu Wenxing, Kia Yuanyou Mar 1991

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.

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Attenuation Of Ground Vibration On Saturated Silt Clay And Rock Bases, Xian-Jian Yang Mar 1991

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 …

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Session 8: Discussions And Replies, Multiple Authors Mar 1991

Session 8: Discussions And Replies, Multiple Authors

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

No abstract provided.

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Dynamical Behavior Of A Slightly Alluvial Basin Due To Concentrated Turbulence, Takashi Nishigaki, Kensuke Baba Mar 1991

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.

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Session 8: Opening Remarks, Ricardo Dobry Mar 1991

Session 8: Opening Remarks, Ricardo Dobry

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

No abstract provided.

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Session 8: Co-Chairman's Report, John G. Anderson Mar 1991

Session 8: Co-Chairman's Report, John G. Anderson

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

No abstract provided.

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Site Amplification Effects In The Ubaye Valley (France): Measurements And Modeling, Denis Jongmans, Michel Campillo Mar 1991

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 …

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Soil Amplification Based On Array Observation In Chiba, Japan, Lin Lu, Tsuneo Katayama, Fumio Yamazaki Mar 1991

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 …

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A Novel Method For Synthesizing Acceleration Time History With Consideration Of Earthquake Environment, He Yang Mar 1991

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.

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Application Of Fuzzy Set Theory In Option Of Response Spectra, Zhou Xiyuan, Su Jingyu Mar 1991

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 …

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Session 9: Discussions And Replies, Multiple Authors Mar 1991

Session 9: Discussions And Replies, Multiple Authors

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

No abstract provided.

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Earthquake Damage Done At Right Angles To Epicentral Direction, Makoto Nasu Mar 1991

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 …

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Fault Induced Ground Deformations And Their Effect On Structures, Luis E. Vallejo, Mahiru Shettima Mar 1991

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 …

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Geological And Seismicity Evaluation Of Srinagarind Dam, S. Klaipongpan, V. Chakramanont, J. Pinrode, P. Chittrakarn Mar 1991

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, …

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