Liquefaction Testing of Stratified Silty Sands

Amini, Farshad; Qi, Guilin

doi:10.1061/(asce)1090-0241(2000)126:3(208)

Cited by 214 publications

(59 citation statements)

References 18 publications

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“…For instance, when keeping constant void ratio it has been found that liquefaction resistance decreases as ines rise (e.g., [38][39][40][41][42]). If relative density is held constant used for comparison, liquefaction resistance grows with the addition of ines (e.g., [40,[42][43][44]).…”

Section: Ll < 35%mentioning

confidence: 99%

New Insight in Liquefaction After Recent Earthquakes: Chile, New Zealand and Japan

Alberto-Hernandez¹,

Towhata²

2017

Earthquakes - Tectonics, Hazard and Risk Mitigation

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Liquefaction has proved to be one of the major geotechnical issues caused by earthquakes. It is one of the most costly phenomena and has afected several cities around the world. Although the topic has been studied since the 1960s, new questions are emerging. The earthquakes of Chile in 2010, New Zealand in 2010 and 2011, and Japan in 2011 had in common not only being some of the largest earthquakes of this decade but also having a problem of extensive liquefaction. Although most seismic codes have provisions against liquefaction, there are still some misconceptions regarding the characteristics of soil susceptibility and the efect of repeated liquefaction. This chapter introduces a detailed report of the damage caused by liquefaction in the cities afected by those earthquakes and also highlights observations in liqueied areas that were unexpected.Advanced geotechnical testing was conducted and compiled to compare them with previous assessment criteria and observations. A more comprehensive framework for the evaluation of liquefaction susceptibility and countermeasures will be presented and a roadmap of future work in the area will be described.

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Section: Ll < 35%mentioning

confidence: 99%

New Insight in Liquefaction After Recent Earthquakes: Chile, New Zealand and Japan

Alberto-Hernandez¹,

Towhata²

2017

Earthquakes - Tectonics, Hazard and Risk Mitigation

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“…The eŠects of non-plasticˆnes on the monotonic behaviour of sand are increasingly understood, however there is still no consensus on how non-plasticˆnes may aŠect the cyclic behaviour of silty sands. For example, for tests carried out at constant void ratio (CVR) on sands of diŠerent origins, the cyclic resistance ratio, CRR, deˆned as the cyclic stress ratio required to cause liquefaction after a certain cycle of loading (Youd et al, 2001), was found to increase with increasingˆnes content by Chang et al (1982) and Amini and Qi (2000), to decrease with increasingˆnes content by Kuerbis et al (1988) and Finn et al (1994), but to decrease forˆnes contents less than the limitingˆnes content and increase forˆnes contents larger than the LFC by Polito and Martin (2001), Xenaki and Athanasopoulos (2003), Ueng et al (2004) and Ravishankar (2006). Keeping the void ratio constant while increasing theˆnes content implies an increase or a decrease or an initial decrease followed by an increase in the density of the sand-silt mixture, which may in‰uence the result.…”

Section: Introductionmentioning

confidence: 99%

Influence of Non-Plastic Fines on the Response of a Silty Sand to Cyclic Loading

Dash

Sitharam

Baudet

2010

Soils and Foundations

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Data from cyclic loading tests on sand-ˆne mixtures made of Ahmedabad sand and quarry dust are presented. Tests were performed at constant void ratio, constant relative density and constant sand skeleton void ratio, for a variety of nes contents. Instead of looking at the direct eŠect ofˆnes content on the cyclic response of the sand-ˆne mixtures, a novel approach of analysing the cyclic test data is proposed, by normalising these data with respect to state. The important diŠerence with other similar work on plain sand is that the reference line for normalising must take account of theˆnes content. Simple deˆnitions of equivalent void ratio, which take account ofˆnes content, have been used. The results presented indicate that state plays an important role in deˆning the cyclic resistance ratio and pore water pressure generation during cyclic loading.

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“…ASTM D4254 ve ASTM D4253 standartları en çok %15 ince dane oranına sahip malzemeler için geçerlidir. Ancak, birçok araştırmacının ince dane oranı %15'den daha fazla olan zeminlerde de, maksimum ve minimum boşluk oranını belirlemek için ASTM prosedürünü kullandıkları görülmektedir [9][10][11][12][13]. …”

Section: Kullanılan Malzemeunclassified

Nonplasti̇k Si̇lt Kum Karişimlarinda Bootstrap Yöntemi̇ İle Boşluk Suyu Basinci Oluşumunun Değerlendi̇ri̇lmesi̇

Karakan¹,

Altun²

2018

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZBu çalışmanın temel amacı, tekrarlı yükler altında nonplastik silt kum karışımlarının boşluk suyu basıncı üretimini literatürdeki üç farklı modeli kullanarak incelemektir. Boşluk suyu basıncı oluşumunda, kumlu zeminlerde silt içeriğinin etkisini araştırmak amacıyla dinamik üç eksenli deneyler yapılmıştır. Deneylerde sıvılaşma kriteri olarak, 200 çevrimdeki değer ya da birincil sıvılaşma başlangıcından hangisi daha önce gerçekleşir ise, o durum göz önüne alınmıştır. Altı farklı silt içeriğinde (FC=%0-100) hazırlanan örneklerden, farklı tekrarlı gerilme genliği oranlarında aşırı boşluk suyu basıncı üretiminin ölçülmesi için gerilme kontrollü dinamik üç eksenli deneyler gerçekleştirilmiştir. Deneyler D r =%25-50 rölatif sıkılıkta ve 100 kPa efektif çevre gerilmesi altında yapılmıştır. Deney sonuçları siltli kumların drenajsız dinamik koşullar altında ne denli etkilendiğini bulmak için kullanılmıştır. Seed ve ark. CYCLIC PORE WATER PRESSURE GENERATION IN NON-PLASTIC SILT-SAND MIXTURES ABSTRACTThe aim of this paper is to evaluate the applicability of the available three different models to predict excess pore water pressure generation in non-plastic silty sand mixtures during cyclic loading. Cyclic triaxial tests were performed to investigate the effect of silt content on the pore pressure generation in sand. These tests were carried to 200 cycles or to onset of initial liquefaction, whichever occurred first. Several stress-controlled cyclic triaxial tests were performed to measure excess pore water pressure generation at different levels of cyclic stress ratios for the specimens prepared at six different silt contents (FC=0% to 100%). The specimens were tested under 100 kPa confining pressures at two relative densities of 25% and 50%. Results of these tests were used to investigate the behavior of silty sands under undrained cyclic triaxial testing conditions. Seed et al. [3], Booker et al. [2] and Polito et al. [8] pore water pressure generation models based on test results are also presented in this paper. An attempt to estimate the pore pressure model coefficient  as a function of silt content, relative density, cyclic stress ratio was made.

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Liquefaction Testing of Stratified Silty Sands

Cited by 214 publications

References 18 publications

New Insight in Liquefaction After Recent Earthquakes: Chile, New Zealand and Japan

New Insight in Liquefaction After Recent Earthquakes: Chile, New Zealand and Japan

Influence of Non-Plastic Fines on the Response of a Silty Sand to Cyclic Loading

Nonplasti̇k Si̇lt Kum Karişimlarinda Bootstrap Yöntemi̇ İle Boşluk Suyu Basinci Oluşumunun Değerlendi̇ri̇lmesi̇

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