Behavior of Soil Reinforcements in Slopes

Onur, Mehmet İ̇nanç; Tuncan, Mustafa; Evirgen, Burak; Ozdemir, Bertan; Tuncan, Ahmet

doi:10.1016/j.proeng.2016.06.061

Cited by 18 publications

(7 citation statements)

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“…Maximum values for Y s0 and G s0 for these simulations are representative of strong rock (Y s0 = 146 MPa, G s0 = 100 GPa). Minimum values (Y s0 = 174 kPa, G s0 = 27 MPa) are similar to the cohesion and shear modulus for clay (Onur et al 2014). The strength and shear modulus for damaged material in successful simulations are also similar to the properties of sediment.…”

Section: Matching δVsupporting

confidence: 57%

Predicting Asteroid Material Properties from a DART-like Kinetic Impact

Kumamoto¹,

Owen²,

Syal³

et al. 2022

Planet. Sci. J.

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NASA’s Double Asteroid Redirection Test (DART) mission is the first full-scale test of the kinetic impactor method for asteroid deflection, in which a spacecraft intentionally impacts an asteroid to change its trajectory. DART represents an important first step for planetary defense technology demonstration, providing a realistic assessment of the effectiveness of the kinetic impact approach on a near-Earth asteroid. The momentum imparted to the asteroid is transferred from the impacting spacecraft and enhanced by the momentum of material ejected from the impact site. However, the magnitude of the ejecta contribution is dependent on the material properties of the target. These properties, such as strength and shear modulus, are unknown for the DART target asteroid, Dimorphos, as well as most asteroids since such properties are difficult to characterize remotely. This study examines how hydrocode simulations can be used to estimate material properties from information available post-impact, specifically the asteroid size and shape, the velocity and properties of the impacting spacecraft, and the final velocity change imparted to the asteroid. Across >300 three-dimensional simulations varying seven material parameters describing the asteroid, we found many combinations of properties could reproduce a particular asteroid velocity. Additional observations, such as asteroid mass or crater size, are required to further constrain properties like asteroid strength or outcomes like the momentum enhancement provided by impact ejecta. Our results demonstrate the vital importance of having as much knowledge as possible prior to an impact mission, with key material parameters being the asteroid’s mass, porosity, strength, and elastic properties.

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Section: Matching δVsupporting

confidence: 57%

Predicting Asteroid Material Properties from a DART-like Kinetic Impact

Kumamoto¹,

Owen²,

Syal³

et al. 2022

Planet. Sci. J.

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show abstract

“…Mohr-Coulomb göçme kriterine göre granüler zeminlerdeki kayma dayanımı içsel sürtünme açısı ve kenetlenme etkisinden kaynaklanmaktadır. Geogridlerde ise bahsi geçen parametrelere ek olarak adezyon kuvveti ile sürtünme direnci oluşmaktadır [4]. Bu yüzden literatürdeki çalışmalar genellikle farklı koşullar altındaki zemin donatılarının sıyrılma direnci veya kopma mukavemetini incelemeye yöneliktir.…”

Section: Giriş (Introduction)unclassified

Üç boyutlu yazıcı teknolojisi ile üretilen geogridlerde ölçek etkisi

GÜLEÇ

Evirgen

2023

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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Son dönemlerde tıp, güzel sanatlar, makine, havacılık ve hatta yiyecek sektörüne kadar birçok alanda üç boyutlu yazıcı teknolojisi uygulama yeri bulmaktadır. Bu çalışmada, her türlü katı cismin yazdırılmasına imkan tanıyan söz konusu teknolojinin geoteknik alanında kullanılabilirliğini değerlendirmek için üç boyutlu çıktıları alınan geogridlerde ölçek etkisine odaklanılmıştır. Özellikle laboratuvarda gerçekleştirilen ölçekli çalışmalarda küçültülen zemin hücresi oranında geogridlerin de küçültülmesi gerekmektedir. Aksi halde, deneylerde yapılan kabuller ve sınır koşulları arazideki gerçek durumu yansıtamamaktadır. Bu amaçla, referans olarak adlandırılan orijinal geogridler ile birlikte 1:1, 1:2 ve 1:4 ölçeklerinde üretilen geogridler, çekme testi ve kesme kutusu deneylerine tabii tutulmuştur. Çıktı ham maddesi olan ABS filamentinin ortalama çekme mukavemeti %1,45 birim şekil değiştirme değerinde 14,60 MPa hesaplanmıştır. 0,10 mm ve 0,20 mm katman kalınlığına sahip baskı kalitesinin çekme mukavemeti üzerinde ciddi bir etkisi olmamasına rağmen, ölçek oranı azaldıkça nihai çekme mukavemeti ve birim şekil değiştirme değerleri azalmaktadır. Diğer taraftan, üç boyutlu geogrid çıktılarını içeren kesme kutusu deneylerinde orijinal geogrid donatılı deneylere kıyasla kayma gerilmesi değerlerinde ortalama %10,00 artış gözlenmiştir. Sonuç olarak üç boyutlu yazıcı teknolojisinin projelere özgü inovatif geosentetiklerin üretiminde kullanılabileceği kanıtlanmıştır.

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“…The geogrid improves the engineering properties of the foundation by mechanical stabilization 24 – 27 . Several studies have been carried out to understand the geosynthetic reinforced expansive subgrades behavior 21 , 28 – 32 . The use of geogrid improves the service life of the pavement structure by reducing the reflective crack and reinforcing the subgrade materials 33 – 38 .…”

Section: Introductionmentioning

confidence: 99%

An experimental study on strength improvement of expansive subgrades by polypropylene fibers and geogrid reinforcement

Tiwari

Satyam

2022

Sci Rep

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The rapid development of infrastructure often encounters the loose subgrades and is becoming difficult to carry to construction activities. Numerous counteracting methods are developed to control the swelling-shrinkage behavior of the expansive subgrades. The mechanical stabilization of the expansive subgrades by reinforcing with the polypropylene fiber and geogrid is sustainable. Geogrids and polypropylene fibers have been used extensively to strengthen the expansive subgrade and foundations as individuals. The polypropylene fiber reinforcement enhanced the reinforced expansive subgrades's tensile strength capacity, wherein the geogrid reinforcement is the quick fix mechanical stabilization technique, which reduces the pavement failures. In this research, the polypropylene fiber and geogrid reinforcement’s combined effect has been evaluated to stabilize the pavement subgrades. The various mechanical strength test such as unconfined compressive strength (UCS) and large direct shear box test was conducted to evaluate the mechanical interaction between expansive subgrades, polypropylene fiber, triaxial geogrid, and biaxial geogrid at the interface. The polypropylene fiber of 12 mm length was used in the proportion of 0.25%, 0.5%, and 1.0% and single geogrid layer at mid-depth. The result shows that reinforced subgrades’ shear strength with a layer of biaxial/ triaxial geogrid and polypropylene fiber increases by 177%. It is also observed that the unconfined compressive strength of the expansive subgrades increased ranging 3.8–139.6% with the inclusion of polypropylene fiber with geogrid in different combinations. The combined reinforcement method shows an effective treatment methodology to improve the property of expansive subgrades.

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Behavior of Soil Reinforcements in Slopes

Cited by 18 publications

References 0 publications

Predicting Asteroid Material Properties from a DART-like Kinetic Impact

Predicting Asteroid Material Properties from a DART-like Kinetic Impact

Üç boyutlu yazıcı teknolojisi ile üretilen geogridlerde ölçek etkisi

An experimental study on strength improvement of expansive subgrades by polypropylene fibers and geogrid reinforcement

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