Modeling Stone Columns

Castro, José Villaverde

doi:10.3390/ma10070782

Cited by 49 publications

(24 citation statements)

References 85 publications

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“…An equivalent footing was considered at a depth of two-thirds the column and assuming a 2:1 load spread beneath the footing it was found that the induced stress at the tank boundaries were negligible (12%). Similar approach was presented by Ali et al [10] and Castro [46]. In the finite element model, test tank dimensions used in the experiments were considered for comparison of predicted results with experimental data.…”

Section: Finite Element Analysismentioning

confidence: 99%

Numerical Study on Behaviour of Encased Stone Columns with Partial Content of Shredded Tyre Chips in Soft Clay Bed

Mazumder

Ayothiraman

2021

Int. J. of Geosynth. and Ground Eng.

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The utility of construction of stone columns in soft soil like clay, marine soil in coastal regions as a ground improvement technique is widely acknowledged. This study presents a numerical analysis of behaviour of ordinary and encased columns, made of various mix proportions of shredded tyre chips and stone aggregates, through Finite Element modelling (with Plaxis 3D software). It is observed that encased columns exhibited remarkable decrease in bulging with respect to ordinary columns. This was true even for columns composed of high proportion of tyre chips (50-100% by volume) owing to generation of higher hoop strain in such columns. The development of hoop strain increased the tensile strength of encasement and hence the column stiffness. The study illustrates the variation of maximum lateral deformation and the corresponding depth with the amount of tyre chips in the mix proportion forming the column. A decrease in bulging along with bulging at greater depths was observed in encased columns, the bulging was negligible for columns wherein the tyre content varied between 0 and 30% by volume. The settlement reduced remarkably with the construction of encased columns irrespective of the mix proportions composing the columns. The study concludes that partial replacement (30-70% by volume) of stone aggregates with shredded tyre chips in encased columns in soft soil is feasible with encasement of significant stiffness.

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Section: Finite Element Analysismentioning

confidence: 99%

Numerical Study on Behaviour of Encased Stone Columns with Partial Content of Shredded Tyre Chips in Soft Clay Bed

Mazumder

Ayothiraman

2021

Int. J. of Geosynth. and Ground Eng.

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“…The second type is for physical piles, which are currently made up of stone or colloidal silica grout without a chemical reaction with neighboring soil (Gallagher et al, 2007;Saoudi et al, 2013). The reinforced effect of the stone pile comes from its own mechanical properties Saoudi et al (2013), Castro (2017), while stabilization from colloidal silica can also be attributed to silica nanoparticle migration (Gallagher et al, 2007). On the whole, chemical piles are still more generally practiced in soil improvement, but the interest in physical piles such as silica nanoparticle has increased due to its eco-friendly characteristics and effectively stabilized effects.…”

Section: Introductionmentioning

confidence: 99%

Multi-Scale Analysis of Geotechnical and Physicochemical Changes in Loess Caused by Nano-SiO2 Pile Migration

et al. 2021

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Understanding property changes in soil improvement using a new technique is critical for enhancing engineering activity. However, little is known about nano-SiO2 pile-induced changes in soil properties due to its excellent properties as an alternative new additive material. This study aims to examine the changes in properties of loess stabilized with nano-SiO2 pile after curing for 28 days. Using samples taken from four desired radii (i.e., 5, 10 15, and 20 cm), we tested their mineralogical, structural, physicochemical, and index properties and analyzed the relationship of these properties to strengthen the link between microscopic characteristics and macroscopic behaviors. We then discussed the mechanism of the changes in the treated loess properties. The test results show that nano-SiO2 pile induced a physical structure modification in the treated loess and, consequently, an isotropic process with coarser particles due to crystallinity. This resulted in a solidification process in loess with nano-SiO2 pile, causing a decrease in water content and void ratio as well as an increase in natural density, thereby improving its mechanical strength. Meanwhile, the specific surface area (SSA)and cation exchange capacity (CEC) of treated loess were smaller than those of original loess, and there were slight changes in chemical properties. The disintegration rate of treated loess decrease compared with the original loess. The interactional relationship of the microscopic and macroscopic observation was facilitated to better understand the mechanism of changes in nano-SiO2 pile-treated loess properties. This finding reveals that nano-SiO2 pile has the potential as an alternative stabilized technique in loess improvement due to its obvious performance improvement and slight chemical changes.

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“…Bu dört metot 2D olarak değerlendirilirken beşinci modelleme tekniği olarak vurgulanan "Full 3D" modelde ise sistem kompleks halde değerlendirilerek üç boyutlu analizler yapılmıştır [9]. Bu araştırmalar sonucunda, geleneksel taş kolon uygulamalarında analizlerin modellemeye uyumu açısından Castro 2017 yılında, birim hücre metodunun oturma ve konsolidasyonun analizinde uygun olup stabilite problemlerinde uygun olmadığını; düzlem gerilme modelinin ve homojenleştirme metodunun kullanıldığı çalışmalarda oturma, konsolidasyon ve stabilite problemlerinde kısmen uygun olduğunu ve 3D modelin kullanıldığı araştırmalarda oturma, konsolidasyon ve stabilite problemleri açısından tamamen uygun olduğunu ortaya koymuştur [10].…”

Section: Introductionunclassified

Sarmal Malzemeli̇ Granüler Kolonlarin Sonlu Elemanlar Yöntemi̇ İle İncelenmesi̇

Erenson¹,

Terzi²

2020

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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Granüler kolon uygulamaları, zemin taşıma kapasitesinin artırılmasında, sıvılaşmanın önlenmesinde ve stabilitenin sağlanmasında günümüzde yaygın kullanılan güçlendirme teknikleri arasında yer almaktadır. Bu çalışmada, polyester ve ömrünü tamamlamış atık araç lastikleri ile sargılanmış taş ve kum kolonların geridolgusuz ortamda düşey yükleme altındaki deformasyon davranışları ve yük taşıma kapasiteleri deneysel ve nümerik olarak incelenmiştir. Kolon stabiletisinin düşey yükleme altında bozulmasını engellemek amacıyla kullanılan sargılama materyallerinin göçme anındaki kritik davranışlarını ortaya koyan bu araştırmalar sonucunda, atıl halde bulunan araç lastikleri polyester sarmallı kolonlara göre daha düşük seviyelerde deformasyonlar göstermiştir. Diğer bir deyişle geridolgu malzemesinin bütüncül yapısını muhafaza etmek için kullanılan atık lastikler, taşıma kapasitesi artışında önemli bir rol oynamıştır. Bu uygulama, aynı zamanda geri kazanım açısından ömrünü tamamlamış lastiklere yeni bir kullanım alanı açmaktadır. Yapılan laboratuvar deneyleri ve bu deneyler ile benzer sonuçlar ortaya koyan analizler sonucunda, lastik sarmallı kolonlar, polyester sarmallı kolonlara göre 6 ile 12 kat arasında daha yüksek taşıma kapasitesine ulaşmışlardır.Nowadays, reinforcement techniques applied with granular column applications are widely used in increasing soil bearing capacity, preventing liquefaction and providing stability. In this study, polyester encased granular columns and tire encased granular columns were tested under vertical loading without backfill. Deformation behavior and load bearing capacity of granular columns were investigated experimentally and numerically. In this research, the critical behavior of the encasement materials used to prevent the deterioration of column stability under vertical loading has been demonstrated and lower deformations were observed in tire encased columns than polyester encased columns. In other words, the waste tires provide the integrative structure of the backfill material and have played an important role in increasing bearing capacity. This application opens new usage areas for end of life tires in terms of recycling. As a result of the laboratory tests and numerical analyses that showed similar results with these experiments, the tire encased granular columns reached 6 to 12 times more bearing capacity than the polyester encased granular columns

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Modeling Stone Columns

Cited by 49 publications

References 85 publications

Numerical Study on Behaviour of Encased Stone Columns with Partial Content of Shredded Tyre Chips in Soft Clay Bed

Numerical Study on Behaviour of Encased Stone Columns with Partial Content of Shredded Tyre Chips in Soft Clay Bed

Multi-Scale Analysis of Geotechnical and Physicochemical Changes in Loess Caused by Nano-SiO2 Pile Migration

Sarmal Malzemeli̇ Granüler Kolonlarin Sonlu Elemanlar Yöntemi̇ İle İncelenmesi̇

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