following the recent work of the authors in development and numerical verification of a new kinematic approach of the limit analysis for surface footings on non-associative materials, a practical procedure is proposed to utilize the theory. it is known that both the peak friction angle and dilation angle depend on the sand density as well as the stress level, which was not the concern of the fo...

 In pavement design, the CBR and direct shear tests are two very common laboratory investigations for predicting the strength of a subgrade layer. The relationship between the CBR and water content has been commonly presented in analyses, with the result of the direct shear being expressed from the aspect of effective cohesion and the internal friction angle. Even though most natural soil is in...

Future planetary exploration missions will require rovers to traverse very rough terrain with limited human supervision. Wheel-terrain interaction plays a critical role in rough-terrain mobility. In this paper an on-line estimation method that identifies key terrain parameters using on-board rover sensors is presented. These parameters can be used for accurate traversability prediction or in a ...

Inspecting the behavior of the rockfill materials is of significant importance in analysis of rockfill dams. Since the dimensions of grains in such materials are greater than the conventional sizes suitable for soil mechanics tests, it is necessary to experimentally study them in specific large-scale apparatuses. In this research, the behavior of rockfill materials in two large rockfill dams co...

To explore the mechanism of microstructural change in salinized soil under freeze-thaw cycles and strength characteristics subgrade improved by fly ash, an unconfined compressive test, a triaxial shear scanning electron microscopy test were carried out using samples with different ash contents along Suihua to Daqing expressway China. The results showed that after several cycles, strength, cohes...

This study aims to fully explore the influence of rock joint roughness in slope stability analysis an open mine. Therefore, based on least squares parameter estimation method, a generalized shear strength coupling roughness, which is used evaluate design, was established by matching formula reflecting relationship between coefficient and parameter. Firstly, verify calibrate model, physical dire...

Abstract Study of mechanical properties rock under hydro-mechanical coupling. The MTS815 mechanics system is used to perform triaxial compression tests water-saturated sandstones different confining pressures and pore water pressures. results show that the peak deviation stress its corresponding axial strain, residual stress, initial dilation deformation modulus sandstone are related pressure p...

This study includes the effect of lime addition on engineering properties gypseous soil taken from a part Najaf- Karbla plateau (52, 48, 72% gypsum). Also this shows increase in proportion gypsum northwest direction area. Maximum dry density and optimum moisture content (2.065, 2.025 2.003) at 15%, 14% 15% respectively for three samples. The maximum decrease while increases with increasing rati...