JI Weiwei,YANG Qing,KONG Gangqiang,et al.Triaxial Test on Mechanical Properties of Saturated Sand Influenced by Pore Liquid Phase State[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(04):871-877.
JI Weiwei,YANG Qing,KONG Gangqiang,et al.Triaxial Test on Mechanical Properties of Saturated Sand Influenced by Pore Liquid Phase State[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(04):871-877. DOI: 10.13409/j.cnki.jdpme.20211120004.
Triaxial Test on Mechanical Properties of Saturated Sand Influenced by Pore Liquid Phase State
The decomposition of hydrate will cause changes in the pore liquid phase of the sediments during the process of natural gas hydrate mining, which reduces the safety and stability of the seabed. Based on the low temperature and high pressure triaxial test apparatus, using silt fine sand as the skeleton, the ice-containing/ice-free methane hydrate sediment samples and saturated sand samples were prepared, and the triaxial compression tests were carried out. The stress-strain and strength characteristics of the sample with different pore liquid phases were analyzed. The changes in parameters such as pore water pressure and tangent modulus during the shearing process were compared. The test results show that the strength ratio between ice-containing/ ice-free methane hydrate sediments and saturated sand is about 2.6:1.7:1, and all three samples show strain hardening; the structure of the ice hydrate sediment is stronger than the others, which means a high initial tangent modulus of the ice hydrate sediment; but its tangent modulus decreases rapidly when the structure is destroyed after shearing.
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