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  • Centrifuge shaking table tests on effect of vertical drain

    Table 3 gives liquefaction and dissipation periods for each model, thereby, the observation about drain system’s benefit could be more clearly and accurate. Each cell includes two values: first one is period normalized by liquefaction duration at depth of 17.6 m at center area for main shaking event, second one indicated in the parenthesis

  • Centrifuge shaking table tests on 4 × 4 pile groups in

    Jul 11, 2018· A series of centrifuge shaking table model tests are conducted on 4 × 4 pile groups in liquefiable ground in this study, achieving horizontal–vertical bidirectional shaking in centrifuge tests on piles for the first time. The dynamic distribution of forces on piles within the pile groups is analysed, showing the internal piles to be subjected to greater bending moment compared with external

  • Numerical modeling of liquefaction and its impact on

    Dec 01, 2019· Verification of centrifuge test results for earthquake shaking. • Inclusion of a structural element (anchor) in computational model. • Response of suction piles under combined actions of environmental and earthquake loads during liquefaction. • Sensitivity of anchor response to several parameters and practical observations.

  • Centrifuge Model Testing of Liquefaction Mitigation via

    Oct 10, 2019· A set of saturated Ottawa sand models was treated with microbially induced calcite precipitation (MICP) and subjected to repeated shaking events using the 1-m radius centrifuge at the UC Davis Center for Geotechnical Modeling. Centrifuge models were constructed to initial relative densities (D R 0) of approximately 38% and treated to light

  • Centrifuge modelling of liquefaction and lateral spreading

    Jun 30, 2015· This paper presents the results of five centrifuge model tests of earthquake-induced liquefaction and lateral spreading in sand using a laminar box. These centrifuge experiments simulate a gently sloping, H = 6 m thick stratum of saturated homogeneous sand of infinite lateral extent and relative densities of 45% and 75%.

  • Centrifuge modelling and analysis of site liquefaction

    Sep 27, 2020· Two centrifuge models of 32 and 26 cm-thick, level, Nevada sand depos-its, were built in 2D laminar box and subjected to base excitation inflight at 25g to simulate 8

  • Centrifuge Modeling of the Effect of Preshaking on the

    A set of saturated Ottawa sand models was treated with microbially induced calcite precipitation (MICP) and subjected to repeated shaking events using the 1-m radius centrifuge at the UC Davis

  • Numerical Simulation of Centrifuge Experiments on

    Figure 1 shows a benchmark centrifuge experiment on the potential mitigation of liquefaction of silt strata by the SCs to be simulated in this study (Adalier et al., 2003). The model was tested at a 50 g gravitational acceleration field. A rectangular laminar box with flexible walls was used. Ground water table was at the soil surface initially.

  • Centrifuge model tests on liquefaction-induced settlement

    Dec 01, 2013· Besides site investigations and numerical analyses,,,several experimental studies based on physical model tests, such as one-dimensional column tests,,,, shaking table tests,, and centrifuge model tests,,,,,, have been conducted to examine the effects of liquefaction in stratified sands. Previous studies indicate that the

  • Soil-Pile-Structure during Liquefaction on Centrifuge

    Centrifuge Apparatus and Shaking Table Model tests were conducted using the dynamic geotechnical centrifuge at the Institute of Technology, Shimizu Corporation, Tokyo. Fig.1 shows the plan and side view of the centrifuge. The arm radius of the centrifuge to the basket platform is 3 .35 m for static tests and 3 .11 m for dynamic tests.

  • Centrifuge shaking table tests on effect of vertical drain

    Table 3 gives liquefaction and dissipation periods for each model, thereby, the observation about drain system’s benefit could be more clearly and accurate. Each cell includes two values: first one is period normalized by liquefaction duration at depth of 17.6 m at center area for main shaking event, second one indicated in the parenthesis

  • Centrifuge modelling and analysis of site liquefaction

    Sep 27, 2020· Two centrifuge models of 32 and 26 cm-thick, level, Nevada sand depos-its, were built in 2D laminar box and subjected to base excitation inflight at 25g to simulate 8

  • CENTRIFUGE SIMULATIONS OF LARGE-SCALE SHAKING TABLE

    Life-size steel and prestressed concrete piles were used in these tests. The large-scale tests involved intense shaking that produced strong nonlinear stress-strain effects and degradation of soil stiffness due to liquefaction in the foundation soil models. The dynamic centrifuge tests treated the large-scale models as their prototypes.

  • Centrifuge modeling of the seismic responses of sand

    Oct 01, 2014· Earthquake engineering uses centrifuges to model dynamic events at relatively low cost .The key scaling relationships for dynamic events are shown in Table 1.The scaling relationships between a prototype subjected to base shaking (the amplitude of the base acceleration, a p, and the frequency, f p) in earth′s gravity (1 g), and the corresponding 1/N centrifuge model tested at an

  • Soil Liquefaction Induced Uplift of Underground Structures

    up the model. A scaled model is made to correspond with the pro-totype at the predetermined centrifuge g level. As a result, a 1:N model experiences the same stress-strain condition as the prototype when subjected to a centrifugal acceleration of a N 3g level (Schofield 1980). Table 1 shows a set of scaling laws to interpret

  • Centrifuge modeling of the behavior of caisson-type quay

    Centrifuge modeling of the behavior of caisson-type liquefaction and related damage occurred in Yaulin, Centrifuge shaking table tests

  • Centrifuge Modeling and Mitigation of Manhole Uplift due

    The apparent unit weight of Model 1 was 9.57 kN/m3 including thesensorsmountedinside[Figs.3(handi)]andthatofModel2is 9.98 kN/m3 as summarized in Table2. A mitigation method was applied to centrifuge Models 3 and 4. Model 3 [Figs. 3(c and e)] has a filtering net with a diameter of 10 mm, whereas Model 4 [Figs. 3(d and f)] has a filtering net of 15

  • Observation of post-liquefaction progressive failure of

    HOSTED BY Observation of post-liquefaction progressive failure of shallow foundation in centrifuge model tests Akira Ishikawaa,b, Yan-Guo Zhoub,n,1, Yasuhiro Shamotoa,b, Hideyuki Manoa, Yun-Min Chenb, Dao-Sheng Lingb aInstitute of Technology, Shimizu Corporation, Tokyo 135-8530, Japan bMOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Institute of Geotechnical Engineering

  • Numerical Simulation of Centrifuge Experiments on

    Figure 1 shows a benchmark centrifuge experiment on the potential mitigation of liquefaction of silt strata by the SCs to be simulated in this study (Adalier et al., 2003). The model was tested at a 50 g gravitational acceleration field. A rectangular laminar box with flexible walls was used. Ground water table was at the soil surface initially.

  • Dynamic centrifuge tests on liquefaction of clayey sand ground

    Then liquefaction model tests on clayey sand with clay content of 10% are performed by means of ZJU-400 geotechnical centrifuge shaking table, and the other model for clean sand with the same

  • Some Important Aspects of Physical Modelling of

    Physical modeling of liquefaction in 1‐g shaking table and dynamic centrifuge test become very popular to simulate the ground behavior during earthquake motion. 1‐g shaking table tests require scaled down model ground which can be prepared in three methods; water sedimentation, moist tamping and dry deposition method. Moist tamping and dry deposition method need saturation of model

  • Centrifuge shaking table tests on effect of vertical drain

    The vertical drain systems are well known methods and used as remediation against earthquake-induced soil liquefaction for many years. The purpose of the study is to investigate the effect of different vertical drain systems for the liquefiable soil by centrifuge modeling technique. The seismic behavior of liquefiable soil was performed firstly.

  • Centrifuge Study of Offshore Platform Response to

    The paper describes a series of specialized centrifuge-shake table tests performed at the University of California at Davis (UC Davis) to investigate the behavior of offshore steel-jacket template structures subjected to earthquake excitations. The program tested two single piles and a truss-braced four-leg template with ungrouted piles.

  • Publications Geotechnical and Environmental Department

    Zeybek, A and Madabhushi, SPG (2017) Centrifuge testing to evaluate the liquefaction response of air-injected partially saturated soils beneath shallow foundations. Bulletin of Earthquake Engineering, 15. pp. 339-356. ISSN 1570-761X

  • Volume V Issue I International Journal of Research and

    Mathematical model of the structural system is obtained by system identification method. Fuzzy Logic can be a system identification method. It is known as fuzzy logic, an algorithm for the mathematical projection of the natural, in other words, human intelligence. In this study, steel model chimney and shaking table were used as material.

  • effects of shaking tables hetveer-breugel.nl

    Multiple shaking tables tests of seismic pounding effect Abstract. In order to investigate the longitudinal pounding effect of highway bridges with high-piers under strong ground motions, multiple shaking tables tests of a 1/10 scaled continuous rigid frame and simply-supported girder bridge with high-piers were carried out.

  • abstract volume Seventh International Conference on Case

    Centrifuge Modelling of Earthquake Effects in Uniform Deposits of Saturated Sand 3.57 xix Vlatko Sesov (Macedonia) Ikuo Towhata Naoyuki Harada (Japan) Shaking Table Tests on Effiency of New Type of Drains 3.59 Yulman Munaf Shamsher Prakash (USA) Displacement of Bridge Abutment Model under Earthquake Loading 3.61

  • Acta Geotechnica No New Issue Oregon State University

    Influence of fault process zone on ground shaking of inland earthquakes: Verification of Mj = 7.3 Western Tottori Prefecture and Mj = 7.0 West Off Fukuoka Prefecture earthquakes, southwest Japan Kenichi Fukushima, Yuji Kanaori, Fusanori Miura Application of fracture network model with crack permeability tensor on flow and

  • GEOENG Geotechnical Engineering Deep Foundation

    Mitigation of Liquefaction-Induced Lateral Flow GEE0170.PDF. GEE0280.PDF. Cyclic Torsional and Triaxial Liquefaction Tests Measuring QuasiElastic Deformation Properties GEE0317.PDF. Lateral Spreading During Centrifuge Model Earthquakes. Kinematic Elasticity of a Granular Material. Engineering Geological Appraisal of the Regional Development

  • Idriss I. M., Soil Liquefaction During Earthquakes, 2008

    Table 1 Susceptibility of soil deposits to liquefaction during strong seismic shaking (Youd and Perkins 1978, with permission from ASCE). book Likelihood that cohesionless sediments, Distribution of when saturated, would be susceptible to liquefaction cohesionless sediments Type of deposit in deposit < 500 years Holocene Pleistocene Pre-Pleistocene

  • Numerical Methods in Geotechnical Engineering M A Hicks

    modeling 427. modelling 426. foundations 411. hardening 409. triaxial 397. dam 386 . Post a Review You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read. Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new

  • EVALUATION OF SOME PHYSICAL–CHEMICAL PROPERTIES OF

    One‐gram sample was mixed with 10‐mL distilled water (specific gravity 0.904 kg/m 3) and allowed to stand at ambient temperature (31 ± 2C) for 30 min, and then centrifuged at 3,000 rpm for 30 min using centrifuge model 800D (Hettich, Universal 11, Herford, Germany). Water absorption capacity was expressed as percent water bound per gram flour.

  • 18th International Conference on Soil Mechanics, Paris

    Shaking model tests on mitigation of liquefaction-induced ground flow by new configuration of embedded columns 1623 Essais sur table vibrante pour une attenuation de lcoulement des sols du a la liquefaction par une nouvelle configuration de colonnes enterrees Takahashi N., Derakhshani A., Rasouli R., Towhata I., Yamada S. Structure-Soil Massif

  • Soil Liquefaction During Earthquakes Nature Soil

    Soil Liquefaction During Earthquakes Free ebook download as PDF File (.pdf), Text File (.txt) or read book online for free. Licuefacción de Suelos durante Terremotos. I. M. Idriss & R. W. Boulanger. July, 2008. Earthquake Engineering Research Institute. 264

  • Dr Domenico Lombardi The University of Manchester

    Shaking table data Dataset Experimental data used in the manuscript entitled "Construction of simplified design p-y curves for liquefied soil" by Lombardi et al (2017)

  • Practical Guidance for Clinical Microbiology Laboratories

    Jul 20, 2020· In 2015, there were an estimated 1.2 million new TB cases in HIV-positive individuals (11% of all new cases of TB), 60% of whom were living in India, Indonesia, China, Nigeria, Pakistan, and South Africa. Although the mortality rate from TB has fallen 22% between 2000 and 2015, TB is one of the top 10 causes of death worldwide.

  • Centrifuge Shaking Table Modeling Of Liquefaction

    Centrifuge Shaking Table Modeling Of Liquefaction. Further experimental results from centrifuge modeling, large shaking table, and eld tests would enhance our ndings.Furthermore, the effect of several parameters such as ground density, amplitude and frequency of input motion, pile head constraint, and superstructure on the maximum total lateral force was investigated, and the results are

  • Centrifuge modeling of liquefaction effects during

    Centrifuge modeling of liquefaction effects during earthquakes (English) Dobry, R. / Taboada, V. / Liu Stress strain relationship of sandy soils directly obtained from 1-D centrifuge shaking table tests. Kazama, M. / Toyota, H. / Towhata,

  • Centrifuge modelling of liquefaction and lateral spreading

    Jun 30, 2015· This paper presents the results of five centrifuge model tests of earthquake-induced liquefaction and lateral spreading in sand using a laminar box. These centrifuge experiments simulate a gently sloping, H = 6 m thick stratum of saturated homogeneous sand of infinite lateral extent and relative densities of 45% and 75%.

  • CENTRIFUGE SIMULATIONS OF LARGE-SCALE SHAKING TABLE

    Life-size steel and prestressed concrete piles were used in these tests. The large-scale tests involved intense shaking that produced strong nonlinear stress-strain effects and degradation of soil stiffness due to liquefaction in the foundation soil models. The dynamic centrifuge tests treated the large-scale models as their prototypes.

  • LIQUEFACTION OF OVER-CONSOLIDATED SAND: A CENTRIFUGE

    Sep 15, 2009· A centrifuge testing study is conducted to investigate the effect of over-consolidation on liquefaction in clean saturated sand deposits. Thirty-four shaking tests on 11 level-ground models are performed. Soil models with Over-Consolidation Ratios (OCRs) of 1, 2, and 4 at relative densities of 35%, 50%, and 70% are tested.

  • Centrifuge shaking table tests on effect of vertical drain

    It was observed that liquefaction induced by earthquake causes series damages to buildings and threatens the people and their properties. From the past studies, a number of countermeasures were proposed to reduce the build-up of excess pore water pressure and to enhance the stiffness of the soil during earthquake. The vertical drain systems are well known methods and used as remediation

  • Physical modelling of air injection to remediate liquefaction

    Shaking table models were essentially prepared in the same way as the centrifuge models in a model container with a clear Perspex viewing front. Loose sand models at a relative density of about 40% were saturated very slowly by applying a gravity head and infiltrating the de-aired water from the base. It is worth noting that for a comparison, a

  • Some Important Aspects of Physical Modelling of

    Jul 01, 2008· Physical modeling of liquefaction in 1-g shaking table and dynamic centrifuge test become very popular to simulate the ground behavior during earthquake motion. 1-g shaking table tests require scaled down model ground which can be prepared in three methods; water sedimentation, moist tamping and dry deposition method. Moist tamping and dry deposition method need saturation of model

  • Centrifuge modelling of sand embankments and islands in

    The bumpy road shaking table system at the Cambridge geotechnical centrifuge was used to conduct an experimental investigation into the effects of earthquakes on sand embankments and islands. The results of the study show that, when a loose or medium dense embankment or island is subjected to an earthquake, positive pore pressures are generated

  • Centrifuge Modelling of Fibre-Reinforcement as a Liquefaction

    shaking table tests. Outcome from centrifuge tests (Wang and Brennan 2014) suggest that large strain potential is required to mobilize the effectiveness of fibre-reinforcement to mitigate liquefaction induced hazards. 1Ke Wang, Division of Civil Engineering, University of Dundee,Dundee, UK, [email protected]

  • CENTRIFUGE MODELING ON MANHOLE UPLIFT IN A

    CENTRIFUGE MODELING ON MANHOLE UPLIFT IN A LIQUEFIED TRENCH TETSUO TOBITAi),GI-CHUN KANGii) and SUSUMU IAIiii) ABSTRACT The uplift behavior of sewage manholes due to liquefaction in a trench is investigated through a series of dynamic centrifuge model tests. The objectives of a series of tests are to study the mechanism of the uplift and to obtain

  • Centrifuge Modeling and Analysis of Level Site

    Centrifuge Modeling and Analysis of Level Site Liquefaction Subjected to Biaxial Dynamic Excitations were conducted on three similar soil models to study the impact of multidirectional shaking on the generation of soil liquefaction. The two uniaxial shaking tests consisted of: i) test with input energy content using the arias intensity is

  • Dynamic centrifuge testing to assess liquefaction potential

    ISMGEO centrifuge has an arm of 3m and a capacity of 240 g-tonnes (maximum payload 400 kg, max acceleration 600 g). In 2010 it was equipped with a 1 degree-of-freedom shaking table. Two hydraulic actuators fire input signals up to 1 MHz at 100g. The peak velocity of the shaking table

  • Analysis of seismic pile response in liquefiable ground

    analysis of large-post-liquefaction is presented and applied in the simulation of piles in liquefiable ground. The simulation method is validated against a centrifuge shaking table test on a single pile usystem, and then applied to study the roles of soil-pile kinematic interaction and the structure-foundation inertial interaction.