Evaluation of dynamic properties of calcareous sands in Egypt at small and medium shear strain ranges

Morsy, Amr M.; Salem, Mona M; Elmamlouk, Hussein H.

doi:10.1016/j.soildyn.2018.09.030

Cited by 44 publications

(15 citation statements)

References 43 publications

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“…Deneylerden elde edilen veriler kullanılarak sönüm değerleri hesaplanabilmektedir. Sönüm değerleri, A=0.707*A maks noktasına karşılık gelen frekanslar olan yarı güç bant noktalarına karşılık gelen frekanslar yardımıyla Eşitlik 1'deki formül kullanılarak tahmin edilebilmektedir [16][17][18].…”

Section: Rezonant Kolon Deney Sistemiunclassified

Düşük Deformasyon Seviyelerinde Kumların Dinamik Özelliklerinin Resonant Kolon Deneyi Yardımıyla Belirlenmesi

Güler¹,

Afacan²

2020

El-Cezeri Fen Ve Mühendislik Dergisi

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Zeminlerin dinamik özelliklerinin belirlenmesi geoteknik mühendisleri için büyük önem arz etmektedir. Depremler nedeniyle zeminlerin gerilme-deformasyon ve mukavemet özellikleri değişmektedir. Bunun sonucunda, zeminlerde deformasyonlar meydana gelmekte ve yapısal hasarlar oluşmaktadır. Deprem bölgelerinde inşa edilecek yapılar için zeminlerin dinamik özelliklerinin belirlenmesi büyük bir ehemmiyet taşımaktadır. Meydana gelebilecek hasarların en aza indirilmesi için zeminlerin tekrarlı yükler altında göstereceği davranışın bilinmesi ve tasarımında dikkate alınması gerekmektedir. Bu amaç doğrultusunda farklı kum numunelerinin dinamik özelliklerinin belirlenmesi üzerine çalışma yapılmıştır. Çalışmada literatürde çokça kullanılan Toyoura kumu ile araziden elde edilen örselenmiş killi kum numunelerinin küçük deformasyon seviyelerindeki dinamik davranışını belirlenmek amacıyla rezonant kolon deney sistemi kullanılarak deneyler yapılmıştır. Yapılan deneyler sonucunda farklı özelliklerdeki numunelere ait kayma modülü ve sönüm oranı eğrileri elde edilmiş olup farklılıklar ve benzerlikler tartışılmıştır.

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Section: Rezonant Kolon Deney Sistemiunclassified

Düşük Deformasyon Seviyelerinde Kumların Dinamik Özelliklerinin Resonant Kolon Deneyi Yardımıyla Belirlenmesi

Güler¹,

Afacan²

2020

El-Cezeri Fen Ve Mühendislik Dergisi

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“…For example, the small-strain shear modulus and damping ratio of calcareous sand under isotropic or anisotropic stress consolidated state have been studied [22][23][24][25]. The effects of confining stress, pore ratio, relative density, grading and particle size, and particle breakage on the dynamic properties are discussed [21,[25][26][27][28][29]. Morsy et al [26] found the effect of void ratio on shear modulus was more pronounced at low void ratios and maximum shear modulus increased as the void ratio decreased.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Shear Modulus and Damping of MICP-treated Calcareous Sand at Low Strains

Zhang¹,

Guo²,

Chen³

et al. 2022

Preprint

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Calcareous sand deposits are widely distributed along the shoreline in ropical and subtropical regions. Microbially induced calcite precipitation treatment (MICP) is a relatively new method to improve the stiffness and strength of the soil. Little is known about the small-strain shear modulus and damping ratio of MICP-treated calcareous sand, which are two crucial parameters for the prediction of the dynamic behavior of soil. A series of resonant column tests are performed to investigate the dynamic performance of MICP-treated calcareous sand, with special attention paid to the influence of treatment duration and confining stress on the stiffness and damping characteristics. The relationship between the initial dynamic shear modulus and unconfined compressive strength is analyzed. Additionally, the empirical equations of the reference shear strain between treatment duration and confining stress are given. The G/G0 of MICP-cemented calcareous sand presents a higher strain sensitivity than that of untreated sand, and its attenuation pattern can be described by Hardin-Drnevich model. The σc has an apparent effect on the degradation characteristics of the dynamic shear modulus of MICP-treated calcareous sand with a low cementation level, however, its effect decreases with the increasing treatment duration. The relationship between the reference shear strain and the treatment duration and confining stress can be described by a power and a linear formula, respectively.

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“…Yang et al established the empirical equations of G/G max -γ a curves for the undisturbed soils in the Yangtze River estuary [9]. Morsy et al evaluated the dynamic characteristics of Egyptian calcareous sand in the range of small and medium shear strains [10]. Wu et al researched the small-strain stiffness of marine silty sand [11].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Dynamic Shear Modulus Ratio and Damping Ratio of the Quaternary Sedimentary Soils in the Offshore Areas of the Yellow Sea

Fang

Xu³

et al. 2021

Geofluids

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The effects of marine and continental sedimentary environments and geological ages on the dynamic shear modulus ratio and damping ratio of the Quaternary sedimentary soils in the offshore areas of the Yellow Sea were analyzed by using a resonant column device (GCTS, USA). The results show the following: (1) The G max of various marine soils increases with the depth and shows a typical linear relationship. (2) The marine transgression has significantly different effects on the dynamic shear modulus ratio versus the shear strain amplitude curves (i.e., G / G max ~ γ a curves) and the damping ratio versus the shear strain amplitude curves (i.e., λ ~ γ a curves) of the different soil types in the offshore areas of the Yellow Sea. The effects of marine transgression were strong on clays, moderate on silty clays, and minor on silts. (3) The geological ages have noticeable effects on the G / G max ~ γ a curves of the tested marine silty clays, marine silts, and continental silty clays, but the effects of geological ages on the λ ~ γ a curves are minimal. The fitting parameters and recommended empirical equations of the G / G max ~ γ a and λ ~ γ a curves for each type of the tested soils (silty clay, clay, and silt) were obtained mirroring the effects of sedimentary environments and geological ages.

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Evaluation of dynamic properties of calcareous sands in Egypt at small and medium shear strain ranges

Cited by 44 publications

References 43 publications

Düşük Deformasyon Seviyelerinde Kumların Dinamik Özelliklerinin Resonant Kolon Deneyi Yardımıyla Belirlenmesi

Düşük Deformasyon Seviyelerinde Kumların Dinamik Özelliklerinin Resonant Kolon Deneyi Yardımıyla Belirlenmesi

Dynamic Shear Modulus and Damping of MICP-treated Calcareous Sand at Low Strains

Experimental Study of the Dynamic Shear Modulus Ratio and Damping Ratio of the Quaternary Sedimentary Soils in the Offshore Areas of the Yellow Sea

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