Speakers

Prof. Dongfang Yang

Guizhou Minzu University, China

Research Area: Quantitative preliminary study on the growth process of phytoplankton in Jiaozhou Bay

Prof. Xiuxin Wang

Southeast university, China

Research Area:  Structural Disaster Design/Structure Inspection/Bridge Design/Seismic Isolation/Sustainable Building Development

Assoc. Prof. Yang Wu

Guangzhou University, China

Title：Experimental investigation on mechanical behavior and particle crushing of calcareous sand retrieved from South China Sea

Abstract: Calcareous sand containing weak particles originated from the deposition of skeletal residue of marine organisms is susceptible to significant particle crushing under compression and shearing. The breakage of grains results in excessive deformation and foundation failure. A series of isotropically drained and undrained triaxial compression tests were performed on reconstituted calcareous sand samples at different initial densities and at a wide range of confining stresses. The amount of particle crushing for calcareous sand after shearing was measured and quantified. Experimental results demonstrate that the shear response of calcareous sand had been well interpreted within the critical state framework. The amount of particle crushing for calcareous sand increases with increasing density and confining stress. Compared with the undrained condition, a larger amount of particle crushing of calcareous sands is observed in the drained triaxial compression test. Stress-dilatancy curves exhibit similar varying tendency for calcareous sand. Multiple critical state lines for calcareous sands with different initial densities are identified in the void ratio and logarithm of the mean stress plane. Considering the variation in stress ratio at the critical state induced by particle crushing, all stress paths are normalized to determine the state bounding surface for calcareous sand at varying densities and stresses.

Prof. Hongfu Zhou

Shandong University of Science and Technology, China

Research Area: Engineering Geology and Geological Hazards