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Articles 151 - 180 of 358
Full-Text Articles in Geotechnical Engineering
Liquefaction Analysis Of Lower San Fernando Darn Using Strength Ratios, Scott M. Olson, Timothy D. Stark
Liquefaction Analysis Of Lower San Fernando Darn Using Strength Ratios, Scott M. Olson, Timothy D. Stark
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Olson (2000) evaluated 33 liquefaction flow failure case histories to assess the yield strength ratio and liquefied strength ratio mobilized during the failures. Using back-analysis procedures developed by Olson (2000), yield and liquefied shear strengths are shown to be proportional to the pre-failure vertical effective stress and are related to standard and cone penetration resistances. This paper examines the triggering of liquefaction and subsequent flow failure of Lower San Fernando Dam using yield and liquefied strength ratios. The yield strength ratio is used to correctly predict the occurrence of liquefaction in the upstream hydraulic fill of the dam, and the …
Observations On The San Fernando Dams, Michael H. Beaty, Peter M. Byme
Observations On The San Fernando Dams, Michael H. Beaty, Peter M. Byme
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A review of the Upper and Lower San Fernando dams during the 1971 San Fernando earthquake is presented in light of current understanding of post-liquefaction behaviour. The concepts of liquefaction, limited liquefaction, cyclic mobility, partial drainage, water filming, and mixing are discussed in relation to these dams. Blowcount data is reviewed and the critical zones of hydraulic fill within each dam are found to have comparable values of N1/3-cs. Limit equilibrium and finite difference stress/ deformation analyses support a minimum post-earthquake strength for the dams of approximately 14 to 24 kPa (300 to 500 psf). The importance of …
Liquefaction Potential Evaluation Along Active Faults At The Head Of The Gulf Of Aqaba, Jordan, Nasser M. Mansoor, Tina M/ Niemi, Anil Misra
Liquefaction Potential Evaluation Along Active Faults At The Head Of The Gulf Of Aqaba, Jordan, Nasser M. Mansoor, Tina M/ Niemi, Anil Misra
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The city of Aqaba, Jordan lies within a major seismic region along the active plate boundary of the Dead Sea Transform. A NE-trending, strike-slip fault that originates in the Gulf of Aqaba apparently terminates under the city along four NW-trending normal- to oblique-slip faults. These normal faults accommodate active tectonic subsidence at the head of the Gulf of Aqaba. Paleoearthquake data from five trench excavations across these faults were collected to characterize the closest seismic source to the city. Ground rupture from an earthquake produced a fault scarp sometime before A.D. 1045-1278. A minimum estimate for the magnitude of the …
Analyses Of Liquefaction-Induced Deformation Of Grounds And Structures By A Simple Method, Susumu Yasuda, Nozomu Yoshida, Hiroyoshi Kiku, Hidenori Abo, Masato Uda
Analyses Of Liquefaction-Induced Deformation Of Grounds And Structures By A Simple Method, Susumu Yasuda, Nozomu Yoshida, Hiroyoshi Kiku, Hidenori Abo, Masato Uda
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The authors proposed a simple method to estimate liquefaction-induced deformation of grounds and structures. Adaptability of the method to the settlement of footings was studied. Centrifuge tests for the footing of transmission tower were selected to demonstrate the adaptability of the method. Analyses were carried out under the same conditions of the centrifuge tests. By comparing the analyzed results with the tested results, it was concluded that the effect of thickness of liquefied layer and soil density on the settlement of footing can be evaluated well by the simple method. Effect of countermeasures on the settlement of footing also could …
Seismic Ground Settlement And Deformation Behavior Of Reclaimed Lands In The 1995 Kobe Earthquake, Kiyoshi Hayakawa, Tamotsu Matsui, Kenji Harada
Seismic Ground Settlement And Deformation Behavior Of Reclaimed Lands In The 1995 Kobe Earthquake, Kiyoshi Hayakawa, Tamotsu Matsui, Kenji Harada
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
After the 1995 Kobe Earthquake, particular attention has been paid on the settlement observed at reclaimed lands located at between Osaka and Kobe, in reference to their geological characteristics. In this paper, the ground surface elevations before and after the 1995 Kobe Earthquake were compared to evaluate the seismic ground settlement of reclaimed lands. Calculated settlements by using an available empirical formula were compared with measured ones. A further study was carried out to investigate the seismic ground settlement calculated by using a numerical simulation program called “FLIP” at a selected reclaimed land. In reference to the data available from …
Investigation Of Sites Liquefied During Taiwan Chi-Chi Earthquake, Sheng-Huoo Ni, Horng-Yuan Lai
Investigation Of Sites Liquefied During Taiwan Chi-Chi Earthquake, Sheng-Huoo Ni, Horng-Yuan Lai
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The purpose of this paper is to present the geotechnical investigation results of some liquefaction sites in central Taiwan, including Nantou City and Zhanghua County during Chi-Chi Earthquake, 1999. The major damages caused by liquefaction in these sites are also presented. The several methods used to evaluate the liquefaction potential are used to assess these sites. The suitability of these methods to assess these sites is discussed in this paper.
Study Of Liquefaction Damages Of Quay-Walls And Breakwaters During Kobe Earthquake, Yasuo Tanaka, Y. Yagiura, K. Shimokawa, S. Higashi, T. Kishida, N. Mizuwake
Study Of Liquefaction Damages Of Quay-Walls And Breakwaters During Kobe Earthquake, Yasuo Tanaka, Y. Yagiura, K. Shimokawa, S. Higashi, T. Kishida, N. Mizuwake
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
During Kobe Earthquake, very extensive damages of harbor facilities such as quay-wall and breakwater occurred in Kobe Port and also along the coastal areas between Kobe and Osaka cities. Major causes of the damages were the liquefaction of sands underlying and behind the concrete caisson and also strong earthquake shaking force on the caisson. The degree of damage varied considerably depending on location and also on the size of structure. In order to understand the mechanism of damage as well as the factors that controlled the degree of damage, it was necessary to examine and analyze the case records of …
Liquefaction Analysis Of A Bridge Site In Assam (India), Umesh Dayal, Sudhir K. Jain
Liquefaction Analysis Of A Bridge Site In Assam (India), Umesh Dayal, Sudhir K. Jain
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A rail-cum-road bridge with approach embankments is to be constructed on the Brahmputra river near Bogobil in Assam (India). The project site is located in Brahmputra’s alluvial plain and lies in an area of very high seismic hazard (zone V of Indian seismic zone map as per IS: 1893-1984) and traverse through the liquefiable ground. A two-level earthquake design criterion has been used: safety-evaluation ground motion of PGA of 0.6g, and a functional-evaluation ground motion of 0. lg. The liquefaction analysis has been carried using a “simplified procedure” originally developed by Seed and Idriss and progressively revised, extended and refined …
Earthquake-Induced Spalling Of Rock Slopes, Northridge Earthquake, January 17, 1994 — A Case Study, David Cummings
Earthquake-Induced Spalling Of Rock Slopes, Northridge Earthquake, January 17, 1994 — A Case Study, David Cummings
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The 1994 Northridge earthquake (Mw=6.7, ML=6.4), southern California produced a 100-foot thick, 3,000-foot linear zone of fractures interpreted as a spalled slab near the crest of a ridge in the Simi Hills, 7 miles northwest of the epicenter. The strike and dip of the slab parallel the strike of the ridge and the dip of the topographic slope, respectively. The fractures cut across bedding and joint planes. An analytical model based on earthquake-induced stresses is used to describe the mechanism of spalling. Earthquake-induced tensile stresses are related to (I) propagation direction of the wavefront, (2) peak particle velocity, …
Three Dimensional Nonlinear Joint Analysis For Assessment Of Slope Stability, Soheil Razavi, Hiroyuki Kimura
Three Dimensional Nonlinear Joint Analysis For Assessment Of Slope Stability, Soheil Razavi, Hiroyuki Kimura
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper the behavior of an artificial slope, during a cyclic loading, is investigated by utilizing shaking table test and numerical simulation obtained from a finite element analysis. The effects of rock bolts and rope nets, used to stabilize the slope during earthquake, are investigated in several experimental and analytical cases. The slippage between rock bolt and soil is simulated by a nodal link element, placed at the contact area of rock bolt and soil. Using rock bolts and rope nets as reinforcement, affect the response of the model by reducing the maximum displacement of the slope along with …
Probability-Based Liquefaction Evaluation Using Shear Wave Velocity Measurements, C. Hsein Juang, Ronald D. Andrus, Tao Jiang, Caroline J. Chen
Probability-Based Liquefaction Evaluation Using Shear Wave Velocity Measurements, C. Hsein Juang, Ronald D. Andrus, Tao Jiang, Caroline J. Chen
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Three preliminary probability-based models and one artificial neural network model for evaluating soil liquefaction potential using shear wave velocity measurements are presented and compared with the deterministic curves developed by Andrus et al. The probability models are developed using logistic regression and Bayesian techniques applied to the same case history data used to develop the deterministic curves. The case history data consists of in situ shear wave velocity measurements at over 70 sites and field performance data from 26 earthquakes. The artificial neural network model is a high-order function capable of tracking the irregular boundary separating individual liquefaction and no …
Review Of Slope Stability Analysis In The Ports Of Long Beach And Los Angeles, Allen M. Yourman Jr., Ambi Thurai, V. R. Nadeswaran, Gerald M. Diaz
Review Of Slope Stability Analysis In The Ports Of Long Beach And Los Angeles, Allen M. Yourman Jr., Ambi Thurai, V. R. Nadeswaran, Gerald M. Diaz
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The combined San Pedro Bay, California Ports (Long Beach and Los Angeles) have been developed mostly by placing dredged material behind rock dikes to create useable land and the wharfs constructed over the rock dikes. An overview of the stability analysis of the dikes was presented in a 1991 paper that summarized slope stability and seismic criteria prior to 1991. Since that time, deeper channel depths, higher seismic criteria, and higher seismic survivability expectations by the users have resulted in higher levels of analysis. This paper provides an update of a paper presented in 1991 and presents data regarding slope …
Large Motion Assessment In Soils Under Dynamic Loading, E. Foerster, H. Modaressi
Large Motion Assessment In Soils Under Dynamic Loading, E. Foerster, H. Modaressi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
This paper presents the mathematical formulation of the nonlinear multiphase dynamic model meant for porous media, obtained by applying the finite transformation assumption. This assumption is appropriate when large motions take place either during mass wasting processes, such as large slumps and earthflows, or during earthquake events when site liquefaction occurs and results for instance in large irrecoverable settlements or lateral spreads. The weak formulation and numerical implementation of the dynamic model uses the mesh-free h-p clouds method, which is based on the more general Partition of Unity Method. The mesh-free numerical methods seem indeed to be more appropriate for …
Effects Of Dynamic Properties Of Rockfill Materials On Seismic Response Of Concrete-Faced Rockfill Dams, Xingzheng Wu, Maotian Luan, Junxia Xin
Effects Of Dynamic Properties Of Rockfill Materials On Seismic Response Of Concrete-Faced Rockfill Dams, Xingzheng Wu, Maotian Luan, Junxia Xin
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper, the equivalent-linear method is used for three-dimensional seismic response analyses of concrete-faced rockfill dams (CFRDs). Different combinations of various parameters such as small-strain shear modulus, strain-dependent patterns of modulus and hysteretic damping, are considered to systematically investigate the effects of dynamic properties of rockfill-type coarse-grained materials on seismic dynamic response of CFRDs. It is concluded that the nonlinearity of embankment material has a significant effect on both vibration characteristics and seismic response behavior of CFRDs. Numerical results presented are instructive to gain a better understanding on earthquake-resistant behavior of CFRDs and the effects of dynamic properties of …
A Study On Failure Mechanism Of Embankment Dams For Irrigation Damaged By The 1995 Hyogoken-Nanbu Earthquake, Kazunori Uchida, Tuyosi Torii, Syuichi Tsujino, Susumu Ando, Keiji Higasio, Taniaki Yamamoto
A Study On Failure Mechanism Of Embankment Dams For Irrigation Damaged By The 1995 Hyogoken-Nanbu Earthquake, Kazunori Uchida, Tuyosi Torii, Syuichi Tsujino, Susumu Ando, Keiji Higasio, Taniaki Yamamoto
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The objects of this investigation are to examine the following mechanism of embankment dams for irrigation damaged by the 1995 Hyogoken-Nanbu Earthquake; 1) the mechanism and process of collapse for the Idenoshiri-Ike embankment dam using the effective stress earthquake response analysis; 2) the mechanism of upper slope failure for the Sugatadani-Ike embankment dam using the total stress earthquake response analysis as well as the slope stability analysis with seismic intensity. As a result, the following conclusions are obtained for each objects; 1) the mechanism and process of collapse due to liquefaction can be analyzed that the liquefied areas initially occurred …
Fluidization Behavior Of Silty Soils In The Shear Zone Base On Ring Shear Tests, Gonghui Wang, Kyoji Sassa
Fluidization Behavior Of Silty Soils In The Shear Zone Base On Ring Shear Tests, Gonghui Wang, Kyoji Sassa
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Using a newly developed large ring-shear apparatus, a series of tests was conducted on silty soils to study their undrained shear behavior. The samples were made by mixing loess into a fine-grained silica sand with 10, 20, and 30% loess by weight. By performing tests at different initial void ratio, the undrained shear behavior of samples with different loess contents at loose and medium-dense states was presented and discussed. Basing on the tests results, effects of loess contents on the peak and residual shear strengths are examined. It was found that adding loess into the host sand could lower the …
Water Films Involved In Post-Liquefaction Flow Failure In Niigata City During The 1964 Niigata Earthquake, Takeji Kokusho, Katsuhisa Fujita
Water Films Involved In Post-Liquefaction Flow Failure In Niigata City During The 1964 Niigata Earthquake, Takeji Kokusho, Katsuhisa Fujita
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Natural sand deposits are in most cases heterogeneous and layered in the horizontal direction due to stratification. If such deposits are liquefied during earthquakes, water films are likely to develop beneath less permeable sublayers leading to destabilization of a sloping ground. In Niigata city, large lateral flow displacements were reported during the Niigata earthquake in almost flat areas. Possible involvement of the water films in lateral flow failure in liquefied ground during the earthquake is examined in this research based on various site investigation data of Niigata city. Soil profiles in the area estimated from many bore-hole logging data indicate …
Study Of Dynamic Bahavior Of Ground Dams With Account Of Moisture Content Under Seismic Actions, B. E. Khusanov, S. I. Umarkhonov
Study Of Dynamic Bahavior Of Ground Dams With Account Of Moisture Content Under Seismic Actions, B. E. Khusanov, S. I. Umarkhonov
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Ground dams as it is well known have a complex geometry and physical non-uniformity. Dams with inner (central) little-water-saturated obstacle in the form of a so-called core which is formed from little-water-saturated clayey soil are more frequent in Central Asia. Slope zones around this core are of water-saturated stone filled soils. Water infiltration, that is moisture content of soil leads to the change of strength parameters of the core material. Stress-strain state of ground dams is studied in this paper with account of moisture content of clayey parts of the dam on seismic action with records of real velosigrams. Dam …
Dynamic Design Of Ground Dams Under The Action Of Dynamic Loads, S. I. Umarkhonov
Dynamic Design Of Ground Dams Under The Action Of Dynamic Loads, S. I. Umarkhonov
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Stress-strain state and non-stationary dynamic behavior of ground dam under kinematic action in the form of synthetic seismogram are studied in the paper by the method of finite differences. The regularity of deformation of dam material was taken as elasto-plastic one. Numerical results obtained are given in the form of graphs. The author of this paper worked out the methods using the finite-differential methods of M.Wilkins’ scheme and carried out the design of non-homogeneous ground dam with account of wave processes occurring in the body of the dam on seismic action. Numeric solutions of closed system of differential equations using …
Seismic Active And Passive Earth Pressures On Rigid Retaining Structures By A Kinematical Approach, Abdul-Hamid Soubra, Borut Macuh
Seismic Active And Passive Earth Pressures On Rigid Retaining Structures By A Kinematical Approach, Abdul-Hamid Soubra, Borut Macuh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The seismic active and passive earth pressure problems are investigated by means of the kinematical method of the limit analysis theory. Two rotational kinematically admissible failure mechanisms M1 and M2 are proposed. Quasi-static representation of earthquake effects using the seismic coefficient concept is adopted. The solutions obtained are rigorous upper-bound ones in the framework of the limit analysis theory. The numerical results of the seismic active and passive earth pressure coefficients are presented and compared with other authors’ results. These results improve the best available upper-bound solutions given by Chen and Liu (1990) in the active case and Soubra (2000) …
Dynamic Model Tests On Gravity Retaining Walls With Various Surcharge Conditions, Ernesto Cascone, Agatino Simone Lo Grasso, Michele Maugeri
Dynamic Model Tests On Gravity Retaining Walls With Various Surcharge Conditions, Ernesto Cascone, Agatino Simone Lo Grasso, Michele Maugeri
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Seismic design of retaining walls is traditionally based on the Mononobe-Okabe method of analysis. In recent years a number of theoretical analyses have been presented to predict the seismic behaviour of gravity retaining walls. In this paper some shaking table tests performed on a small prototype of gravity wall retaining dry sand are described and the experimental results are presented with the aim to provide, though qualitatively, an insight into some important aspects of the dynamic behaviour of retaining structures resting on rigid foundation soil. The M-O theory do not consider the particular boundary condition that in the practical design …
Using Discontinuous Deformation Analysis To Investigate The Dynamic Stability Of Tunnels In Jointed Rocks Under Earthquake Loading, Reza Naderi, Nader Hataf, Arsalan Ghahramani
Using Discontinuous Deformation Analysis To Investigate The Dynamic Stability Of Tunnels In Jointed Rocks Under Earthquake Loading, Reza Naderi, Nader Hataf, Arsalan Ghahramani
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Tunneling is one of the most important problems in rock mechanics that many numerical methods try to investigate. In general, static analysis methods are mainly used to investigate the stability of tunnels, which are not safe in dynamic conditions. This paper is illustrating the use of Discontinuous Deformation Analysis (DDA) in analyzing the stability of tunnels in jointed rocks under earthquake loading. To improve the capability of original DDA method to meet the requirements for analysis of rock tunnels under dynamic loading and time dependent (time history) loading, damping and energy loss have been added to the program. Some numerical …
Analytical Study Of The Nikawa Landslide, Dimitrious Loukidis, Sang-Ho Lee, Quanghee Yi, Philippe L. Bourdeau
Analytical Study Of The Nikawa Landslide, Dimitrious Loukidis, Sang-Ho Lee, Quanghee Yi, Philippe L. Bourdeau
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
One of the most severe landslides triggered by the 1995 Hyogoken-Nambu earthquake was the Nikawa landslide. The seismic ground motion generated excessive pore pressure inside the portion of the slope mass that was below the water table. Data from standard penetration tests suggested that, in spite of the significant percentage of fines in the sand and its slight overconsolidation due to the fluctuation of the water table, the slope material had potential of liquefaction under seismic loading. The objective of the present study was to investigate the consistency between observations and the results of analysis methods for this slope failure. …
Stability Analysis Of The Geosynthetic-Reinforced Modular Block Walls Damaged During The Chi-Chi Earthquake, Ching-Chuan Huang, Fumio Tatsuoka
Stability Analysis Of The Geosynthetic-Reinforced Modular Block Walls Damaged During The Chi-Chi Earthquake, Ching-Chuan Huang, Fumio Tatsuoka
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Psuedo-static stability analysis based on “Coulomb’s one-wedge” and “two-wedge” methods was performed for two geosynthetic-reinforced modular block walls which were either collapsed or lightly damaged during the 1999 Taiwan Chi-Chi earthquake It was shown that two-wedge failure mechanism is a dominant one for the walls investigated. Difference in the seismic behavior of these walls was partially explained based on the psuedo-static analysis. It was also shown that seismic stability of the reinforced wall depends largely on the connection strength between the facing and the geogrid.
Evaluation Of Seismic Safety Of A Large Caisson Structure, Tamotsu Matsui, Kazuhiro Oda, Ikuo Aoshima, Hiroshi Murakami, Akinori Nakahira, Choji Kuroda, Naoto Suzuki
Evaluation Of Seismic Safety Of A Large Caisson Structure, Tamotsu Matsui, Kazuhiro Oda, Ikuo Aoshima, Hiroshi Murakami, Akinori Nakahira, Choji Kuroda, Naoto Suzuki
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Some centrifugal shaking tests were carried out to clarify the mechanism of seismic interaction between a large caisson foundation and soil layers. Based on the test data, two-dimensional seismic effective stress FE analysis was applied, followed by verifying its applicability. Also, to clarify the flexural and shear behavior of the caisson structure members to the ultimate state and to evaluate the flexural and shear resistance, some large-scale model failure tests of poorly reinforced concrete in caisson foundation were carried out. Based on these test results above-mentioned, seismic analyses of an existing large caisson foundation to ground motion in level 2 …
Centrifuge Characterization And Numerical Modeling Of The Dynamic Properties Of Tire Shreds For Use As Bridge Abutment Backfill, Key Rosebrook, Dan Wilson, Boris Jeremic, Bruce Kutter, Amy Smith, Dana Humphrey, Stacey Patenaud
Centrifuge Characterization And Numerical Modeling Of The Dynamic Properties Of Tire Shreds For Use As Bridge Abutment Backfill, Key Rosebrook, Dan Wilson, Boris Jeremic, Bruce Kutter, Amy Smith, Dana Humphrey, Stacey Patenaud
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Two model tests were performed on tire shred fills to document the dynamic elastic material properties of tire shreds using the large centrifuge at UC Davis. The tests were considered to be “element” tests of tire shred material properties, rather than the more typical centrifuge modeling of a site profile. As these were the first tests using tire shred material on the UC Davis centrifuge, new construction and instrumentation techniques were developed. New geophysical wave sources for use with tire shreds were developed to identify reasonable material properties to use in FEM analyses. In addition to the geophysical testing for …
Seismic Design Of Pile Foundations In Southern Indiana, Dimitrios Loukidis, Rodrigo Salgado, Antionio Bobet
Seismic Design Of Pile Foundations In Southern Indiana, Dimitrios Loukidis, Rodrigo Salgado, Antionio Bobet
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
In this paper, we present an evaluation of the potential risk of earthquake-induced damage to pile foundations in Indiana. Piles are commonly used in foundations of bridge piers in the southern part of Indiana; the potential seismic sources in this region are the Wabash Valley Fault system and the New Madrid Seismic Zone. Based on in-situ test data for specific sites in southern Indiana, one-dimensional wave propagation analyses are performed. Additionally, the liquefaction potential is estimated based on the calculated acceleration profile. Data on real cases of pile damage due to seismic events are collected after an extensive literature survey. …
Earthquake Resistance Of New Type Viaduct Structure, Eiji Wakita, Masayoshi Sato, Takashi Tazoh
Earthquake Resistance Of New Type Viaduct Structure, Eiji Wakita, Masayoshi Sato, Takashi Tazoh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
An experiment and a numerical analysis were carried out in order to examine the earthquake resistance of a new type viaduct structure. The experiment was a dynamic centrifuge modeling which used the viaduct model of the rates 1/50 of a scale. The 3-dimensional finite element analysis was performed in order to confirm the results of the dynamic centrifuge modeling. At the results, new knowledge was obtained with regard to the viaduct structure.
A Field Study And Dynamic Finite Element Analysis Of Railway Retaining Structures Damaged By The Hyogoken-Nambu Earthquake (1995), Yoshinori Nagayama, Tamotsu Matsui, Ikuo Yasukawa, Hiroshi Kasai
A Field Study And Dynamic Finite Element Analysis Of Railway Retaining Structures Damaged By The Hyogoken-Nambu Earthquake (1995), Yoshinori Nagayama, Tamotsu Matsui, Ikuo Yasukawa, Hiroshi Kasai
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The seismic damage to embankments and retaining walls caused by the Hyogoken-nambu Earthquake (1995) was reviewed, rather focusing on railway structures. Nearly eight kilometers of damaged retaining structures were divided into five structural types, such as gravity-type walls, leaning-type walls, embankments, geo-textile-reinforced earth walls, and reinforced concrete walls, and into three categories of the damage, such as collapse, tilt, and crack. It was observed that the damage to gravity-type and leaning-type walls was greater than that to embankments, geo-textile-reinforced earth walls, and reinforced concrete walk, when they are lower than five meters. But some leaning-type walls higher than seven meters …
Shaking Table Tests On Seismic Deformation Of Composite Breakwaters, Hideo Sekiguchi, Hayoung Kim, Katsutoshi Kita
Shaking Table Tests On Seismic Deformation Of Composite Breakwaters, Hideo Sekiguchi, Hayoung Kim, Katsutoshi Kita
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A series of shaking table tests were conducted on composite breakwater systems under 30g centrifugal conditions. The emphasis was placed on investigating the mechanisms of seismic settlement of foundation ground, in particular of the contribution from the dispersion of mound rubble into the foundation soil. In-flight visual observation of the deformation process by a high-speed CCD camera showed the significance of cumulative vertical compression of foundation soils under cyclic loading. Pre- and post-shaking comparisons of weight of the rubble mound revealed that dispersion into the soil had occurred and contributed to caisson settlement.