Earthquake Induced Slope Failure Simulation By Sph,
2010
Ritsumeikan University, Japan
Earthquake Induced Slope Failure Simulation By Sph, Ha H. Bui, R. Fukagawa, K. Sako, Y. Okamura
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Majority of slope stability, slope displacement and soil liquefaction analyses subjected to earthquake loading condition employed the finite element method (FEM) as the standard numerical tool. However, mechanism of soil failure in such condition often involved extremely large deformation and failure behaviors, which were unable to be modeled by FEM since this method was suffered from the grid distortion. In an attempt to overcome this limitation, we present herein our first attempt to extend the smoothed particle hydrodynamics (SPH) method to analyze slope failure behavior due to seismic shaking. For the sake of simplicity, effect of pore-water pressure was not …
Effect Of A Slope On The Dynamic Properties Of Diluvial Terrace,
2010
Chiba University, Japan
Effect Of A Slope On The Dynamic Properties Of Diluvial Terrace, Shoichi Nakai, Yoko Nagata, Toru Sekiguchi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
It is well known that landform influences the behavior of the ground during earthquakes. The objective of this study is to clarify the effect of a slope on the dynamic properties of diluvial terrace based on ground investigations, seismic motion observations and twodimensional finite element analyses, by choosing a target area that has a landform typical to the southern Kanto plain in Japan. Through the study, the followings were found: (1) Due to a weak soil along the slope, amplification becomes very large, but the area of influence is relatively small. (2) Amplification due to ground irregularity itself is relatively …
Improved Methodology For Estimating Seismic Coefficients For The Pseudo-Static Stability Analysis Of Earth Dams,
2010
University of Thessaly, Greece
Improved Methodology For Estimating Seismic Coefficients For The Pseudo-Static Stability Analysis Of Earth Dams, Achilleas G. Papadimitriou, Konstantinos I. Andrianopoulos, George D. Bouckovalas, Kostas Anastasopoulos
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents an improved methodology for estimating seismic coefficients for the pseudo-static stability analysis of earth dams, which is based on a statistical analysis of input data and results for 112 potential failure surfaces, as estimated from 28 two dimensional seismic response analyses for eight (8) different zoned earth dams and high embankments. The new methodology employs design diagrams and equations and estimates the maximum and the effective seismic coefficients as a function of: (a) the peak ground acceleration at the free-field surface of the foundation soil, (b) the predominant period of the seismic excitation, (c) the eigenperiod of …
Incorporation Of The Spatial Correlation Of Arias Intensity Within Earthquake Loss Estimation,
2010
Imperial College London, U.K.
Incorporation Of The Spatial Correlation Of Arias Intensity Within Earthquake Loss Estimation, Roxane Foulser-Piggott, Peter J. Stafford
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Arias Intensity (Ia) has been identified as an efficient intensity measure for the purpose of estimating the likelihood and extent of landslides. This efficiency implies that Arias intensity may logically be used within earthquake loss estimation applications in order to ultimately estimate the damage to spatially-distributed systems or portfolios. In order to estimate the effects of ground motions on such spatially-distributed systems it is important to take into account the spatial correlation of the intensity measure. However, existing landslide loss-estimation models, which use Ia as an input, do not take this aspect of the ground motion into account. …
Landslide Hazard Mapping And Assessment In Himalayas,
2010
Indian Institute of Technology Roorkee, India
Landslide Hazard Mapping And Assessment In Himalayas, A. K. Pachauri
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Himalayas offer a good opportunity to study landslides in hard terrains. The region is a well established seismic region of Asia where earthquakes are common occurrence. The on going plate motion and its collision with Asian plate is the main triggering factor for landslides, but there are geological factors that make the slopes susceptible for landslides to be triggered during rains. The Yatra routes of Char Dham the four pilgrimage centers where millions of Hindus go each year for salvation and heaven abode have to face road blocks each rainy season. The border road organization the pioneer organization looking after …
Nonlinear Time-Domain Analysis Of A Sliding Block On A Plane,
2010
Arizona State University, Tempe, AZ
Nonlinear Time-Domain Analysis Of A Sliding Block On A Plane, Mohamed G. Arab, Edward Kavazanjian Jr., Neven Matasovic
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A time domain finite difference numerical model of a sliding rigid block on a plane is developed using a simple elastic-perfectly plas-tic Mohr-Coulomb interface model. The model is shown to accurately predict the slip-stick and slip-slip behavior deduced from an analytical solution for behavior of a sliding block on a horizontal plane and the results of physical model tests of a block on both hori-zontal and inclined planes subject to harmonic and non-uniform excitation provided the appropriate interface strength is employed. Back analyses of the physical model tests show that for some geosynthetic interfaces, the interface shear strength depends upon …
Numerical Modelling Of Earthquake-Induced Rock Landslides: The 1783 Scilla Case-History (Southern Italy),
2010
University of Rome “Sapienza”, Italy
Numerical Modelling Of Earthquake-Induced Rock Landslides: The 1783 Scilla Case-History (Southern Italy), Francesca Bozzano, Salvatore Martino, Eliana Esposito, Alfredo Montagna, Luca Lenti, Antonella Paciello, Sabina Porfido
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The coastal M. Pacì rock-avalanche was triggered by the 6th February 1783 earthquake near the village of Scilla (southern Calabria) and involved a subaerial volume of about 5·106 m3. This landslide produced a tsunami wave responsible for more than 1500 human life losses near Marina Grande beach. A geological survey and a geomechanical characterization of both the intact rock and the jointed rock mass outcropping in the landslide slope were carried out to obtain an engineering-geology model of the landslide according to an equivalent-continuum approach. Dynamic numerical modelling by FDM code FLAC 6.0 was performed to back-analyse …
Seismic Behavior Of Asphaltic Concrete Core Dams,
2010
Tarbiat Moallem University, Iran
Seismic Behavior Of Asphaltic Concrete Core Dams, Ali Ghanbari, Mohsen Mojezi, Meysam Fadaee
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In current years the use of asphaltic concrete core dams are increased especially in some areas with shortage of clayey materials. These dams also have less earth work in comparison with clay core dams. Despite of many advantages of this kind of dam in compression of other types, the behavior of these dams against earthquakes and seismic condition isn't clearly specified. In this research using CA2 program (Finite difference Code) Some numerical studies about the behavior of asphaltic concrete core dams with various height and slopes to understand the influence of dam geometry on behavior of these dams under earthquake …
Seismic Stability Of The Nailed Slopes,
2010
Chapman University, Orange, CA
Seismic Stability Of The Nailed Slopes, Mehdi M. Waseem, Agarwal Pratibh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The study undertaken in this project pertains to the determination of ultimate bearing capacity of nailed slopes. In this soil is modeled as composed of homogeneous layers of soils. Analysis has been carried out to obtain an upper bound solution of the problem. A two dimensional collapse mechanism has been assumed to ascertain the bearing capacity with the velocity discontinuities radiating from the applied strip load and satisfying the compatibility of the displacements. The mechanism is defined by relevant angles or lengths. Each velocity vector makes an angle of f¢ with the direction of discontinuity. For fu =0 there …
Stability Analysis Of Flood Protection Embankments And Riverbank Protection Works,
2010
Water Resources Department, India
Stability Analysis Of Flood Protection Embankments And Riverbank Protection Works, Rajib Kumar Goswami, Baleshwar Singh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Frequent and widespread flooding is a major problem in Assam, which is a north-eastern state of India. The problem is caused mainly by the Brahmaputra river whose erratic riverbank erosion has been leading to general widening of channels and large-scale instability of banks. In the last century, the river has widened by more than 50% in several stretches causing serious threat to nearby urban centres apart from eroding several thousand hectares of fertile agricultural land including tea gardens. As of now, the width between outer banks ranges from as low as 1.2 km at some sections to as high as …
Stability Assessment And Suggestion For Control Measures Of A Potential Landslide Slope On Nh 94, Uttarakhand Himalaya, India,
2010
Central Building Research Institute (CSIR), India
Stability Assessment And Suggestion For Control Measures Of A Potential Landslide Slope On Nh 94, Uttarakhand Himalaya, India, A. Ghosh, S. Sarkar, D. P. Kanungo, P. K. S. Chauhan, Zamir Ahmad
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
An unstable slope having few houses which were under distress was studied to arrive at suitable control measures. The slope has undergone subsidence at the road level and there are few houses down the road level which have developed major cracks. The study was focused on identification of causes, assessment of slope stability and suggestions for control measures. The study involved geological and geotechnical investigations, slope stability analysis and monitoring of movements. The paper highlights the field observations and results of the study.
Static And Dynamic Behavior Of Earthen Slopes In The Region Of Uttarkashi, India,
2010
IIT Roorkee, India
Static And Dynamic Behavior Of Earthen Slopes In The Region Of Uttarkashi, India, Govardhan Bhat, Navjeev Saxena, S. K. Prasad
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Earthen slopes experience considerable degradation in strength and stiffness during seismic activities. Past earthquakes have revealed the development of landslide and permanent movement of earth mass towards downstream. In this paper, a finite element analysis using GEOSLOPE on earthen slopes under static and dynamic loading due to earthquake has been carried out. The earthen slope is idealized as a plane strain two-dimensional model and base acceleration in the form of typical earthquake motion is represented as external loading. The performance of the slope including the stresses and displacements are analyzed. Further, the focus is on the determination of permanent displacement …
The Effect Of Geometry Changes On Sliding-Block Predictions,
2010
Hellenic Open University, Greece
The Effect Of Geometry Changes On Sliding-Block Predictions, Constantine A. Stamatopoulos, Constantine Mavromihalis, Sarada Sarma
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The sliding-block model is often used for the prediction of permanent co-seismic displacements of slopes and earth structures. This model assumes motion in an inclined plane but does not consider the decrease in inclination of the sliding soil mass as a result of its downward motion, which is the usual state in the field. The paper studies the above effect and proposes an empirical equation correcting the predictions of the sliding-block model. The investigation is performed using the recently-developed multi-block model.
The Stability And Deformation Limit State Corresponding To The High Road Embankments Close To A Bridge,
2010
Technical University of Civil Engineering, Romania
The Stability And Deformation Limit State Corresponding To The High Road Embankments Close To A Bridge, Anton Chirica, Dragos Vintila, Diana Tenea
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The paper presents the analysis of a road embankment with variable height (between 4-10m) placed at Iassy, Romania, in the first year of service. It’s about access ledge at a bridge with total length of about 300m. At this time the embankment presents longitudinal cracks parallel with road axle, lateral knobs corresponding to each compacted layer, infiltrations through the backfill from the top (faulty pluvial system) and from the bottom (flooded foundation soil without drainage system). Foundation soil is a metastable clay. Triaxial tests type CKoD on stress loading paths have shown that this soil is sensitive to moistening at …
Using Recorded Earthquake Signals For Dynamic Analysis Of Masjed Soleiman Embankment Dam,
2010
International Institute of Earthquake Engineering and Seismology (IIEES), Iran
Using Recorded Earthquake Signals For Dynamic Analysis Of Masjed Soleiman Embankment Dam, M. Amel Sakhi, M. Jafari Davoodi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
There is a worldwide interest in the proper seismic design of embankment dams in high seismic hazard zones. The seismic behavior of embankment dams can be evaluated by in-situ dynamic tests (such as processing recorded earthquake signals on dam body), experimental methods (i.e. experiments using large shaking table, centrifuge tests) and numerical methods Using recorded earthquake signals on dam body is a powerful tool for researchers for dynamic analysis of embankment dams. In this research, recorded accelerograms are used to dynamic analysis of Masjed Soleiman embankment dam, the highest rockfill dam in Iran. Using recorded earthquake signals in the basement …
An Analytical Solution For Pile-Soil-Pile Interaction With Unequal Embedded Lengths Under Vertical Harmonic Vibrations,
2010
K. N. Toosi University of Technology, Iran
An Analytical Solution For Pile-Soil-Pile Interaction With Unequal Embedded Lengths Under Vertical Harmonic Vibrations, Mahmoud Ghazavi, Pedram Ravanshenas
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Piles are normally constructed in groups such that they are located in the vicinity of each other. As a result, the response of piles is different from that of an isolated pile. In this paper, the interaction between two piles with unequal lengths in the group is investigated using an analytical solution. The elastic theory model and dynamic winkler model are use to characterise vertical isolated prismatic piles subjected to vertical harmonic vibrations. The results obtained for pile-soil-pile interaction from this solution account for unequal lengths for the two piles. In addition, it has been found that upon loading the …
Analysis Of Soil Nailed Walls Under Harmonic Dynamic Excitations Using Finite Difference Method,
2010
Isfahan University of Technology, Iran
Analysis Of Soil Nailed Walls Under Harmonic Dynamic Excitations Using Finite Difference Method, Alimohammad Sheikhbahaei, Amir M. Halabian, S. Hamid Hashemolhosseini
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Soil nailing is an efficient method to stabilize different soil structures. The method has been extensively used for improving stability of slopes. The construction process of Soil nailed walls commonly involve three basic sections: excavation, nail installation and face stabilization. The nail bars are inserted into ground by either drilling or grouting and are usually arranged in both horizontal and vertical directions. Present research intends to understand Soil-nailed wall behavior under dynamic excitations. Employing finite difference method a three dimensional model has been developed in the proper finite difference code. Soil constitutive behavior for dynamic analyses is predicted taking into …
Analysis Of Tunnel Behaviour Under Seismic Loads By Means Of Simple And Advanced Numerical Approaches,
2010
University of Bologna, Italy
Analysis Of Tunnel Behaviour Under Seismic Loads By Means Of Simple And Advanced Numerical Approaches, Daniela Boldini, Angelo Amorosi, Fabrizio Palmisano
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper different approaches aimed at investigating the dynamic behaviour of circular tunnels in the transverse direction are presented. The analysed cases refer to a shallow tunnel built in an ideal soft clayey deposit. The adopted approaches include one-dimensional (1D) numerical analyses performed modelling the soil as a single phase visco-elastic non-linear medium, the results of which are then used to evaluate the input data for selected analytical solutions proposed in the literature (uncoupled approach), and 2D fully coupled Finite Element simulations adopting visco-elastic and visco-elasto-plastic constitutive assumptions for the soil and the lining (coupled approach). The results are …
Effect Of Elastic And Inelastic Dssi On Seismic Demands Of Sdofs Structures,
2010
Pontificia Universidad Católica de Chile, Chile
Effect Of Elastic And Inelastic Dssi On Seismic Demands Of Sdofs Structures, Esteban Sáez, Fernando López-Caballero, Arézou Modaressi-Farahmand-Razavi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In general, under earthquake loading, the soil reaches the limit of its elastic behavior before the structural elements. Thus, an earthquake analysis approach assuming inelastic structural behavior under fixed base condition or with elastic dynamic soil-structure interaction (DSSI) hypothesis may be inadapted. This paper describes the investigation conducted in order to define the contribution of the pure elastic DSSI effects in the complete inelastic DSSI problem. With this purpose, a comparative analysis between elastic and inelastic soil behavior assumptions for two inelastic single-degree-of-freedom (SDOF) structures and two soils is carried out. The results point out that, in general, inelastic soil …
Effect Of Liquefaction On Pile Shaft Friction Capacity,
2010
University of Cambridge, U.K.
Effect Of Liquefaction On Pile Shaft Friction Capacity, M. E. Stringer, S. P. G. Madabhushi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Piled foundations are commonly used worldwide, and observed failures of these foundations during earthquakes has led to active research in this area. However, the way in which piles support axial loads during earthquakes is still not fully understood. In this paper, the results from centrifuge tests are presented which consider how axial loads are carried by piles during earthquake loading. It will be shown that the piles in dry soils mobilise additional shaft friction to carry the seismically induced axial loading. However, in the case of a pile group passing through a liquefiable soil layer and founded in a dense …
