One-dimensional compression behavior of calcareous sand and its experimental technology under high stress conditions
LV Yaru1，2，LI Zhizhong3，LI Lang4
(1. College of Mechanics and Materials，Hohai University，Nanjing，Jiangsu 210098，China；2. Department of Civil and Environmental Engineering，Hong Kong University of Science and Technology，Hong Kong，China；3. State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact，PLA University of Science and Technology，Nanjing，Jiangsu 210007，China；4. Institute of Rocket Force，Beijing 100085，China)
Abstract：The yield stress and compressive index of calcareous sand under high stress conditions can be investigated by one-dimensional compression tests，but the lateral stress is difficult to be measured. This paper conducted 17 1D compression tests and 17 three-dimensional finite element numerical simulations on calcareous and silica sands. The effects of the tube roughness，thickness and lengths were analyzed. It is found that the compressive modulus of silica sand is approximately 3–4 times that of calcareous sand with an almost identical relative density. The compressive modulus increases with increasing relative density. The yield stresses of calcareous and silica sands are approximately 2 MPa and 10 MPa，respectively，beyond which amount of particles begin crush. The compression index of calcareous and silica sand is approximately 0.90 and 0.65，respectively. By comparing the computed and measured results，it is found that if the lateral stress is back-calculated by the outer tangential stress in tests，the stress state at the center of the samples is reasonable. Fulfilling the requirement in deformation，a smooth inner surface and a thin wall of the tube can efficiently decrease the monitoring error.
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2019, Vol. 38 
