Comparison Of Liquefaction Triggering Analysis Approaches For An Embankment Dam And Foundation,
2010
U.S. Army Corps of Engineers, Sacramento, CA
Comparison Of Liquefaction Triggering Analysis Approaches For An Embankment Dam And Foundation, David C. Serafini, Vlad Perlea
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Success Dam is located on the Tule River, near the city of Porterville, California. The dam is a rolled earth-fill embankment approximately 145 feet high and 3,400 feet long. The embankment is comprised of a central impervious core protected by upstream and downstream outer pervious zones. A majority of the dam is founded on potentially liquefiable Holocene alluvium. Several analytical techniques of varying complexity have been used to determine the liquefaction potential of the foundation Holocene alluvium and the pervious embankment shells. The following analytical techniques were used on the Success Dam Remediation Project: (1) cyclic stress ratio (CSR) evaluation …
Cyclic Torsional Shear Tests To Obtain Dynamic Soil Properties For Seismic Design Of Road Embankments,
2010
Tokyo Denki University, Japan
Cyclic Torsional Shear Tests To Obtain Dynamic Soil Properties For Seismic Design Of Road Embankments, Susumu Yasuda, Takafumi Tsuruda
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Many road embankments have suffered damage during past earthquakes. The authors took soil samples from several embankments and conducted laboratory tests to demonstrate the mechanism of the damages and study appropriate seismic design methods. In the laboratory tests, cyclic torsional shear tests were carried out to obtain undrained cyclic strength, excess pore water pressure and shear modulus after cyclic loading of embankment soils. Test results showed a unique relationship between Plasticity Index and undrained cyclic strength is existed. Relationship between excess pore water pressure ratio and safety factor against liquefaction is also influenced by Plasticity Index. Then appropriate seismic design …
Evaluation Of Seismic Response Of External Mine Overburden Dumps,
2010
Indian Institute of Technology, India
Evaluation Of Seismic Response Of External Mine Overburden Dumps, Radhakanta Koner, Debashish Chakravarty
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The stability of mines external overburden dump slope experiencing an earthquake is controlled by deformations; consequently a stability analysis that predicts slope displacements is desirable. The amount of displacement, deformation occur at the crest of the overburden dumps is an important factor for the seismic loading response of the dumps for the field personnel at the mine site for designing the dump slope geometry. The state of effective stress and seismic intensity significantly affects the stability range. In this paper, a simplified approach is presented for the seismic response of overburden dumps, and the role played by relevant parameters such …
Finite Element Modeling Of The Las Colinas Landslide Under Earthquake Shaking,
2010
Norwegian Geotechnical Institute, Norway
Finite Element Modeling Of The Las Colinas Landslide Under Earthquake Shaking, Huynh Dat Vu Khoa, Hans Petter Jostad
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The Las Colinas landslide that occurred at Santa Tecla (El Salvador, Central America) due to the earthquake of 13 January 2001 is considered as one of the most destructive landslides ever known. This paper studies the ability of Hill’s sufficient condition of stability (1958), which is based on the sign of second-order work, for predicting and describing this catastrophic massive landslide. The general expressions of both local and global second-order work criteria and its implementation into finite element codes are given. By using the non-associated elasto-plastic Hardening Soil Model and the local second-order work criterion, it is demonstrated that potentially …
Geotechnical Characteristics Of Seismically-Induced Aratozawa Landslide, Japan,
2010
The University of Tokyo, Japan
Geotechnical Characteristics Of Seismically-Induced Aratozawa Landslide, Japan, Ivan Gratchev, Ikuo Towhata
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper seeks to investigate the properties of volcanic soil from the Aratozawa landslide, the largest failure triggered by the 2008 Iwate-Miyagi Nairiku earthquake, Japan. Field investigation was carried out to estimate the in-situ characteristics of volcanic material. It was found that the soil was highly weathered, having low dry density and high moisture content. Laboratory examination included a series of triaxial compression tests which were performed to evaluate the dynamic properties of volcanic soil. Results of undrained cyclic loading tests indicated that the material had a high potential for generation of excess pore-water pressures, which could lead to a …
Numerical Analysis Of Failure Of Rudramatha Dam Section During 26Th January, 2001, Bhuj Earthquake,
2010
Indian Institute of Science, India
Numerical Analysis Of Failure Of Rudramatha Dam Section During 26Th January, 2001, Bhuj Earthquake, Amit Srivastava, G. L. Sivakumar Babu
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
On 26th January, 2001, the Kachchh region of Gujarat, India faced devastating earthquake of magnitude 7.6 (Mw) popularly known as “Bhuj” earthquake. Various man made facilities including earthen dams faced varying level of damages during the earthquake and one of the major causes of failure is attributed to wide spread liquefaction of foundation soil. In the present study, a typical Rudramata dam sections located in the Kachchh region is considered for the failure analysis using fully coupled nonlinear dynamic numerical code FLAC 5.0 with pore pressure generation capabilities under dynamic loadings. The analysis is performed using the acceleration …
On The Use Of Empirical Correlations For Estimating The Residual Undrained Shear Strength Of Liquefied Soils In Dam Foundations,
2010
Bureau of Reclamation, Denver, CO
On The Use Of Empirical Correlations For Estimating The Residual Undrained Shear Strength Of Liquefied Soils In Dam Foundations, David Rees Gillette
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Current practice (2009) for seismic analysis of embankment dams relies heavily on empirical correlations with penetration resistance (standard penetration test or cone penetration test) to predict the residual undrained shear strength of liquefied foundation materials. At least six such relationships have been published for the SPT alone, in different “formats.” Some apply a fines adjustment to the SPT blowcounts, but others do not; some express the predicted strength as a ratio with pre-earthquake effective overburden stress, whereas others predict it directly, without explicit consideration of overburden. For the foundations of embankment dams, the difference between the strength-ratio approach and prediction …
Repair Of Landslide "Umka-Duboka" — Seismic Performance Assessment,
2010
IZIIS, Macedonia
Repair Of Landslide "Umka-Duboka" — Seismic Performance Assessment, Vlatko Sesov, Zeljko Zugic
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The Umka-Duboko is a large active landslide in the depth of 10-26 m, created in marly clays, taking up the area of 1.8 sq.km. According to the fact that the new road facility corridor located at the right bank of Sava river, on the meandering apex, crosses the landslide in the length of 3 km the characteristic remediation design solution is given. In this paper is observed seismic performance of this project. The analysis of potential liquefaction in motorway embankment and seismic stability of slope retained by embankment and hydraulic structure were made. The necessity was despite the limited seismic …
Seismic Analysis Of The Reservoir-Earth Dam-Pore Fluid System Using An Integrated Numerical Approach,
2010
Itasca Consulting Group, Inc., Minneapolis, MN
Seismic Analysis Of The Reservoir-Earth Dam-Pore Fluid System Using An Integrated Numerical Approach, Yanhui Han, Roger Hart
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper, an integrated numerical approach is proposed for analyzing the seismic response of the reservoir-earth dam-pore fluid system subjected to earthquake loading. The fluid-mechanical coupling approach is deployed to capture the fluid-solid matrix coupling effects automatically. A hysteretic damping constitutive law is adopted to follow the modulus reduction and damping ratio curves. The Finn-Byrne equation is used to represent the shear-induced volumetric strain behavior of liquefiable materials. The interaction between the reservoir water and the dam boundary is treated as a dynamically updated pressure boundary condition. The deconvolution is accomplished by the equivalent linear program SHAKE. An automatic …
Seismic Performance Evaluation Of A Submarine Gas Pipeline,
2010
URS, Los Angeles, CA
Seismic Performance Evaluation Of A Submarine Gas Pipeline, Wolfgang H. Roth, C. B. Crouse, Ethan M. Dawson, Bei Su
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Analyses were conducted on the seismic performance of a proposed offshore gas flowline, which connects a manifold in 830-m water depth to a riser platform in shallow waters of the outer continental shelf. Climbing a 10-degree continental slope, the flowline will be installed on the seafloor underlain by deep carbonate sediments of sands and silty clays. Two types of analyses were performed for a critical segment of the flowline, where it traverses a narrow ridge flanked by two deep submarine canyons: (1) probabilistic analyses using simplified empirical methods; and (2) deterministic 2D and 3D analyses with FLAC using a nonlinear, …
Seismic Stability Assessment The Raising Of The Geita Tailings Storage Facility, Tanzania,
2010
Rust Geotechnical Consultants, South Africa
Seismic Stability Assessment The Raising Of The Geita Tailings Storage Facility, Tanzania, Michelle Theron, Fritz Wagener, Phillip Steenkamp
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The Geita gold mine, owned by AngloGold Ashanti, is located in the north west of Tanzania on the African Rift Belt in a seismically active. It is also located in an environmentally sensitive area as it is directly upslope of Lake Victoria. The Tailings Storage Facility was constructed as a side valley dam with its maximum design embankment elevation 1216m (i.e. 35m above ground level) and store capacity approximately 60 million tons of tailings. The feasibility of increasing this wall ultimately to 1246m (i.e. 65m above ground level) thereby increasing its capacity by 88.5 million tons, is the topic of …
The Effect Of Earthquake Record Scaling Technique On Embankment Dam Response,
2010
BGC Engineering Inc., Canada
The Effect Of Earthquake Record Scaling Technique On Embankment Dam Response, Hamid Karimian, Somasundaram Sriskandakumar, Adrian Wightman, Li Yan
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The state of the practice in dynamic analysis of structures includes the selection of earthquake records based on the mean (or modal) magnitude and distance of the design earthquake, and linearly scaling of the selected records to the target spectral acceleration at the period of significance, or matching the selected records to the uniform hazard response spectrum (UHRS). A method is presented by Baker and Cornell (2005, 2006a, and 2006b) to develop the conditional mean response spectrum of a ground motion given a target value of the spectral acceleration at the period (or period range) of significance. The shape of …
A Parametric Study On Soil-Pile Kinematic Interaction In Layered Soils,
2010
University of Catania, Italy
A Parametric Study On Soil-Pile Kinematic Interaction In Layered Soils, Daniela Ardita, Michele Maugeri, Ernesto Motta, Erminia Raciti
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In pile-foundation seismic design, until a few years ago, only inertial loads applied by the overstructure at the pile cap were taked into account, neglecting the dynamic interaction. So, good approaches to evaluate inertial interaction effects have been developed, but not for kinematic interaction. Modern national and international codes require to take into account the dynamic soil-pile-ovestructure interaction (inertial and kinematic), without giving any information about kinematic interaction evaluation criteria. In this work a practical method based on the Winkler foundation model is applied to analyse the seismic response of single piles. The analysis is focused on a single pile …
A Simple Numerical Tool For Dynamic Soil-Structure Interaction Analyses Including Non-Linear Behaviour Of Both Structure And Foundation,
2010
Politecnico di Milano, Italy
A Simple Numerical Tool For Dynamic Soil-Structure Interaction Analyses Including Non-Linear Behaviour Of Both Structure And Foundation, R. Figini, C. T. Chatzigogos, R. Paolucci
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper a simple model to take into account dynamic non-linear soil-structure interaction is presented: it consists of a 1 degree-of-freedom (dof) superstructure and a 3 dof macro-element foundation. Both the superstructure and the soil-foundation system exhibit a non-linear behaviour. In particular the superstructure is characterized by an elastic perfectly plastic behaviour, while the foundation macro-element encompasses the two sources of non-linearity that arise in the soil-foundation interface: a) the one due to the irreversible elastoplastic soil behaviour (material non-linearity) and b) the one due to possible foundation uplift (geometric non-linearity). The global model thus entails the following features: …
A Simplified Approach For The Evaluation Of Kinematic Pile Bending,
2010
University of Catania, Italy
A Simplified Approach For The Evaluation Of Kinematic Pile Bending, Francesco Castelli, Valentina Lentini, Michele Maugeri
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
There are two sources of loading of the pile by the earthquake: “inertial” loading of the pile head caused by the lateral forces imposed on the superstructure, and “kinematic” loading along the length of the pile caused by the lateral soil movements developed during the earthquake. Seismic codes prescribe that piles have to be designed for soil deformations arising from the passage of seismic waves which impose curvatures and thereby lateral strains on the piles along their whole length. Accepting these lines, the new Italian seismic normative (NTC, 2008) specify that kinematic effects should be taken into account in the …
Centrifuge Tests And Simple Analyses For Seismic Soil-Structure Interaction,
2010
Kyoto University, Japan
Centrifuge Tests And Simple Analyses For Seismic Soil-Structure Interaction, Shuji Tamura, Keisuke Adachi, Kohji Tokimatsu
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Dynamic centrifuge tests were performed on a superstructure-footing model that was placed on a dry sand surface and subjected to two different input motions having peak accelerations of 60 cm/s2 and 249 cm/s2. Two simple analyses, equivalent linear analysis (SHAKE) and dynamic response of a structure using a sway-rocking model (SR-model) were performed. The following conclusions were drawn: (1) SHAKE and SR-model analyses can simulate the recorded response of the soil and superstructure. However, the shear wave velocity of the ground that can simulate the superstructure response by an SR-model for amax=249 cm/s2 is …
Designing Optimization For Some Eolian Power Unit Taking Into Account The Seismic Loads Influence,
2010
Ovidius University Constanta, Romania
Designing Optimization For Some Eolian Power Unit Taking Into Account The Seismic Loads Influence, Dragos Vintila, Diana Tenea, Anton Chirica
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In the eastern part of the Romanian territory there are wind intensity conditions for some big eolian power units. From lithological point of view, the mentioned area is characterized by a loessial stratum of 3 up to over 20m deep which covers green shale rocks. The paper presents the designing consideration discussed in order to obtain the most economical foundation option. The corresponding calculus conclusions about the soil-structure interactions in seismic conditions are also revealed.
Dynamic Soil Structure Interaction Analysis Of Pile Supported High Rise Structures,
2010
IIIT Hyderabad, India
Dynamic Soil Structure Interaction Analysis Of Pile Supported High Rise Structures, Pulikanti Sushma, Ramancharla Pradeep Kumar
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Experiences from past earthquake disasters clearly shows that the ground motion was responsible for majority of property and life loss. Among the collapsed structures during the 1964 Niigata earthquake, the 1995 Kobe earthquake, the 1999 Koceli earthquake, the 2001 Bhuj earthquake and the 2004 Sumatra earthquake, excessive damage was occurred to pile supported bridges, towers, chimneys, high rise structures, etc. In view of this there is a need to study the complex behavior of soil-pile-structure interaction problems using numerical methods. In this research paper, a numerical study is carried out to understand the dynamic soil structure interaction of a high …
Dynamic Winkler Modulus For Axially Loaded End-Bearing Piles,
2010
University of Patras, Greece
Dynamic Winkler Modulus For Axially Loaded End-Bearing Piles, George M. Anoyatis, George E. Mylonakis
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The problem of dynamic pile-soil interaction and its modeling through the concept of a Dynamic Winkler Foundation are revisited. It is shown that depth-dependent Winkler springs and dashpots, obtained by dividing the complex-valued soil shear tractions and the corresponding displacements along the pile, may faithfully describe pile-soil interaction, contrary to common perception that the Winkler model is always approximate. A theoretical wave model is then derived for analyzing the response of axially loaded endbearing piles embedded in a homogeneous viscoelastic soil medium. Closed-form solutions are obtained for: (i) the displacement field in the soil and along the pile; (ii) the …
Effect Of Uplift Modelling On The Seismic Response Of Shallow Foundations,
2010
University of Auckland, New Zealand
Effect Of Uplift Modelling On The Seismic Response Of Shallow Foundations, Liam Wotherspoon, Michael Pender
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents the development and response of a numerical model for the representation of uplift and reattachment of shallow foundations using the Ruaumoko non-linear dynamic analysis software. Vertical loads carried by the foundation were used to control the rotational and horizontal characteristics, as the stiffness of all degrees of freedom must reduce as the footing progressively detaches from the underlying soil. This culminates in the representation of total uplift, where the foundation provides no stiffness in any degree of freedom until vertical loads become compressive again. Through extension of the capabilities of Ruaumoko, this response was able to be …
