Acta Geotechnica
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Study on the mechanical behavior of sands using 3D discrete element method with realistic particle models
Acta Geotechnica - Tập 15 - Trang 2813-2828 - 2020
Presented is a study on the geometrical characteristics of sand particles and the mechanical behavior of sand material under external loading. Based on computed tomography technique, a reconstruction method of granular particles was developed and used to build a database of 3D geometrical models for sand particles. The studied sand particles showed good regularities in morphological characteristic......
Framework for incorporating multi-level morphology of particles in DEM simulations: independent control of polydisperse distributions of roundness and roughness while preserving form distributions in granular materials
Acta Geotechnica - - Trang 1-24 - 2024
Particle shape in granular materials exhibits both polydisperse and multi-level characteristics, which are intrinsically linked to the mechanical behaviours of granular materials. This study develops a particle generation framework to achieve independent control of polydisperse distributions of roundness (second level of particle shape) and roughness (third level) while preserving form (first leve......
Microscopic origin of shape-dependent shear strength of granular materials: a granular dynamics perspective
Acta Geotechnica - Tập 17 - Trang 2697-2710 - 2021
The shear strength of granular materials has been found to increase nonlinearly with particle asphericity before reaching a steady value independent of particle asphericity. Although the origin of shear strength has been extensively studied, the underlying mechanism of its nonlinear dependency on particle shape remains unclear. In this study, we present a microscopic investigation of shape-depende......
Modeling and monitoring in a soft argillaceous shale tunnel
Acta Geotechnica - Tập 4 - Trang 273-282 - 2009
Taking advantage of measurements from an in situ monitoring program and an elastoplastic model using the finite-difference method, this paper simulates and evaluates the deformation and stability of a tunnel in soft argillaceous shale. The elastoplastic model is implemented in FLAC3D program to simulate the deformation and the stress of the soft argillaceous shale during construction. In situ test......
Bearing strength surface for bridge caisson foundations in frictional soil under combined loading
Acta Geotechnica - Tập 11 - Trang 1189-1208 - 2016
The problem of estimating the bearing capacity of massive caisson foundations in frictional soil under combined vertical (N), horizontal (Q) and moment (M) loading is examined numerically by means of three-dimensional finite element analyses. The analysis is performed with due consideration to the foundation’s depth-to-width ratio (D/B), the magnitude of the vertical load and the caisson-soil cont......
A cyclic elastoplastic constitutive model and effect of non-associativity on the response of liquefiable sandy soils
Acta Geotechnica - Tập 13 - Trang 1283-1297 - 2018
A large number of constitutive models for geomaterials, such as soils and rocks, have been proposed over the last three decades. Those models have been implemented into computer codes and have been successfully used to solve practical engineering problems particularly under monotonic loading conditions. Compared with the models for monotonic loadings, more improvements for cyclic models are necess......
Đánh giá thử nghiệm đất trong suốt của hệ thống rèm hỗn hợp đứng-ngang trong quá trình bơm nước Dịch bởi AI
Acta Geotechnica - Tập 17 - Trang 3293-3313 - 2022
Hệ thống rèm đứng-ngang (rèm VH) đôi khi được sử dụng trong việc bơm nước ở hố móng dưới các điều kiện địa chất thủy văn phức tạp. Tuy nhiên, cơ chế hoạt động của hệ thống này khi rèm ngang là bán thấm và không thể hoàn toàn ngăn chặn tầng nước ngầm dưới vẫn chưa được biết đến. Một thử nghiệm mô hình vật lý đất trong suốt đã được thực hiện để làm rõ cơ chế kiểm soát nước của hệ thống rèm VH với rè......
#rèm đứng-ngang #bơm nước #cơ chế kiểm soát nước #mô phỏng số #địa chất thủy văn
Resilient and permanent deformation of unsaturated unbound granular materials under cyclic loading by the large-scale triaxial tests
Acta Geotechnica - Tập 15 Số 12 - Trang 3343-3356 - 2020
Application of improved physics-informed neural networks for nonlinear consolidation problems with continuous drainage boundary conditions
Acta Geotechnica - - Trang 1-14 - 2023
In this paper, improved physics-informed neural networks (PINNs) with hard constraints (PINNs-H) are introduced to simulate the variation of the excess pore water pressure in the nonlinear consolidation problems with continuous drainage boundary conditions. In the PINNs-H, we modify the network architecture to automatically satisfy the corresponding initial and boundary conditions accurately, and ......
A micro-investigation of unsaturated sand in mini-triaxial compression based on micro-CT image analysis
Acta Geotechnica - Tập 17 - Trang 4799-4821 - 2022
The mechanical behaviours of unsaturated soils are highly related to the water content and pore water and air distributions. Under the context of climate change, geo-disasters related to soil moisture change attract more and more research attentions. Due to the heterogeneity of soil textures and the complicated morphology of liquid phases, it is crucial to understand the microstructural features o......
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