Modeling of Triaxial Pressure Tests with Uniform Granular Materials Discrete Particle Method

Öz

Predicting the mechanical behavior of the soils on which the structures and facilities are built is crucial in civil engineering. Although solutions are made by modeling the soils as continuous homogeneous environments due to their ease and fast solutions, the soil is the combination of particles in a multiphase environment. Therefore, the Discrete Element Method, which offers a closer approach to the soil properties, was used in the study. This study modeled the behavior of homogeneous granular materials under triaxial compression tests using the Discrete Element Method (DEM). DEM, an ideal numerical technique for simulating particle environments, was used to investigate the mechanical responses of granular assemblies when subjected to varying confining pressures. The research focused on the effects of particle shape, size distribution, and contact mechanics on the material's stress-strain relationship and deformation behavior during the test. Using the DEM approach and PFC3D, the triaxial compression test of uniform sands was modeled to estimate the Poisson's ratio, Young's modulus, and bearing capacity.

Anahtar Kelimeler

• Discrete Element Method
• PFC3d
• Triaxial Pressure Test

Modeling of Triaxial Pressure Tests with Uniform Granular Materials Discrete Particle Method

Öz

Yapı ve tesislerin üzerine inşa edildiği zeminlerin mekanik davranışların tam ve doğru olarak tahmin edilmesi inşaat mühendisliği açısından çok önemlidir. Günümüzde gerek kolaylığı gerekse hızlı çözümler sunduğu için zeminler sürekli homojen ortamlar gibi modellenerek çözümler yapılsa da zemin parçacıkların çok fazlı ortamda birleşmesidir. Bu nedenle çalışmada zemin özelliğine daha yakın yaklaşım sunan Discrete Element Method kullanılmıştır. Bu çalışmada, üç eksenli basınç testleri altında homojen granüler malzemelerin davranışı Ayrık Eleman Yöntemi (DEM) kullanılarak modellenmiştir. Partikül ortamları simüle etmek için ideal bir sayısal teknik olan DEM, granüler düzeneklerin değişen sınırlayıcı basınçlara maruz kaldığında mekanik tepkilerini araştırmak için kullanılmıştır. Araştırma, parçacık şeklinin, boyut dağılımının ve temas mekaniğinin, test sırasında malzemenin gerilim-şekil değiştirme ilişkisi ve deformasyon davranışı üzerindeki etkilerine odaklanmıştır. DEM yaklaşımı ve PFC3D kullanılarak üniform kumların üç eksenli basınç testi modellenerek poisson oranı, young modülü ve taşıma kapasitesi tahmin edilmeye çalışılmıştır.

Anahtar Kelimeler

• Ayrık eleman yöntemi
• PFC3d
• üç eksenli basınç testi

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