Experimental Study on the Effects of Initial Shear Stress and Vibration Frequency on Dynamic Strength of Saturated Sands

Zhang, Jian; Cao, Jiuting; Huang, Sijie

doi:10.1155/2019/3758527

Cited by 11 publications

(3 citation statements)

References 17 publications

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“…Taking into consideration of the aforementioned condition, 1 Hz and 0.1 Hz frequency are generally preferred for coarse-grained soil (sandy type) and fine-grained soil (silty type), respectively [62,63]. Based on the analysis of seismic events, Zhang et al [64] also adopted frequency starting from 1 to 3 Hz for saturated sand. However, many studies on dynamic properties of soil considered frequency range in between 0.5 and 2 Hz [65][66][67].…”

Section: Parameters Considered For the Present Studymentioning

confidence: 99%

Experimental investigation on dynamic behavior of silt-rich fly ash using cyclic triaxial and bender element tests

Ram

Mohanty

2021

Innov. Infrastruct. Solut.

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The present study mainly focuses on the evaluation of dynamic properties of silt-rich fly ash from Renukoot, India, under large and small strain conditions using cyclic triaxial and bender element test, respectively. The influence of confining pressure, loading frequency, relative compaction, and shear strain amplitude on dynamic properties of fly ash under small strain and large strain condition has also been studied. The dynamic shear modulus (G) found experimentally from cyclic triaxial test shows the decay in a nonlinear manner with the increment of loading frequency and cyclic shear strain. The increment in dynamic shear modulus of fly ash was noticed with the increment of relative compaction and confining pressure. Similarly, the increase in small strain shear modulus (G max ) was observed with the increment of confining pressure, relative compaction, and frequency of the waveform. The decrease in damping ratio was observed with an increase in shear strain, especially for higher strain side (i.e., γ > 0.5%) but vice versa is not true for lower strain side (γ < 0.5%). Therefore, irrespective of the soil type, there exists a threshold strain beyond which damping ratio decreases with an increase in shear strain. All the parameters except loading frequency have a prominent impact on G and G max is sensitive to the entire considered factors. Finally, empirical correlations were developed between normalized shear modulus ratio (G/G max ) and damping ratio (D) of silt-rich fly ash with cyclic shear strain (γ) at different confining pressure, relative compaction, and loading frequency. The developed correlations can be helpful in calculating the dynamic properties of Renukoot fly ash at different strain levels. The developed correlations will also assist in the safe design of structures with fly ash as geo-material in the seismic-prone regions.

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Section: Parameters Considered For the Present Studymentioning

confidence: 99%

Experimental investigation on dynamic behavior of silt-rich fly ash using cyclic triaxial and bender element tests

Ram

Mohanty

2021

Innov. Infrastruct. Solut.

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“…Much research has been conducted on the behavior of sand under cyclic loading using cyclic triaxial tests, with the focus being on the effects of confining pressure, loading amplitude and frequency, over-consolidation ratio, fine particle content, and relative density, etc. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Sharma and Maheshwari [21] conducted cyclic triaxial tests on sands with different degrees of saturation and found that the damping ratio of saturated sand is greater than that of dry sand and partially saturated sand.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Behavior of Gravelly Sand Reinforced with Geogrid under Cyclic Loading

et al. 2021

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In view of the dynamic response of geogrid-reinforced gravel under high-speed train load, this paper explores the dynamic characteristics of geogrid-reinforced gravel under semi-sine wave cyclic loading. A number of large scale cyclic triaxial tests were performed on saturated gravelly soil reinforced with geogrid to study the influence of the number of reinforcement layers and loading frequencies on the dynamic responses of reinforced gravelly sand subgrade for high speed rail track. The variation of cumulative axial and volumetric strains, excess pore pressure and resilient modulus with number of loading cycles, loading frequency, and reinforcement arrangement are analyzed. The test results reveal that the cumulative axial strain decreases as the number of reinforcement layers increases, but increases with loading frequency. The resilience modulus increases with the number of reinforcement layers, but decreases as the loading frequency increases. The addition of geogrid can reduce the excess pore water pressure of the sample, but it can slightly enhance the rubber mold embedding effect of the sand sample. As the loading frequency increases, the rubber mold embedding effect gradually weakens.

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“…Bu zemin elemanları herhangi bir ilave gerilme öncesinde de kayma gerilmelerine maruz durumdadırlar. Özellikle drenajsız şartlar altında, kumlu zeminlerin tekrarlı yükler altındaki davranışları üzerinde başlangıç statik kayma gerilmesinin etkileri sıvılaşma direnci açısından oldukça önemli bir konu olup günümüzde halen birçok araştırmacı tarafından ele alınmaktadır [2,[4][5][6]. Bu çalışmalar, başlangıç statik kayma gerilmesi varlığının, doygun kumların dinamik özelliklerini etkileyen önemli bir faktör olduğunu ortaya koymakta ve bu etkiyi yansıtabilmek için düzeltme faktörleri (Kα) önermektedirler.…”

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Effect of Initial Shear Stress on the Undrained Shear Behavior of Normally Consolidated Kaolin Clay

Dağdeviren

Gündüz

2020

Bilecik Şeyh Edebali Üniversitesi Fen Bilimleri Dergisi

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Arazideki zeminlerin gerilme koşulları incelendiğinde, zeminlerin pek çok durumda anizotropik gerilme şartlarında olduğu görülmektedir. Bu zeminler, herhangi bir ilave yükleme olmasa dahi kayma gerilmesine maruz durumdadırlar. Günümüzde arazideki gerilme şartlarına bakılmaksızın, maliyet, zaman ve kolaylık gibi gerekçelerden dolayı üç eksenli basınç deneyleri izotropik gerilmeler altında ve başlangıç kayma gerilmesinin olmadığı numuneler üzerinde gerçekleştirilmektedir. Bu nedenle, zeminlerin drenajsız koşullardaki davranışı üzerinde başlangıç kayma gerilmesi varlığının etkisi belirlenmesi gereken önemli bir konudur. Bu çalışmada, laboratuvarda bulamaç çamuru konsolidasyon yöntemi ile hazırlanmış olan normal konsolide kaolin kilinin, farklı başlangıç kayma gerilmeleri ve ortalama efektif gerilmeler altındaki drenajsız davranışı üç eksenli basınç deneyleri kullanılarak incelenmiştir. Deney sonuçları, başlangıç kayma gerilmesindeki artışın, drenajsız kayma mukavemetini ve aşırı boşluk suyu basıncı oluşumunu önemli ölçüde etkileyebileceğini göstermektedir. Çalışma sonunda, izotropik koşullarda gerçekleştirilen üç eksenli basınç deneylerinden elde edilen drenajsız kayma mukavemeti kullanılarak, başlangıç kayma gerilmesine maruz kil zeminlerin drenajsız kayma mukavemetini belirlemeye yönelik olarak bir düzeltme faktörü önerilmiştir.

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Experimental Study on the Effects of Initial Shear Stress and Vibration Frequency on Dynamic Strength of Saturated Sands

Cited by 11 publications

References 17 publications

Experimental investigation on dynamic behavior of silt-rich fly ash using cyclic triaxial and bender element tests

Experimental investigation on dynamic behavior of silt-rich fly ash using cyclic triaxial and bender element tests

Experimental Investigation on the Behavior of Gravelly Sand Reinforced with Geogrid under Cyclic Loading

Effect of Initial Shear Stress on the Undrained Shear Behavior of Normally Consolidated Kaolin Clay

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