海底沉积物温压环境三轴试验系统的研制与初步应用OA北大核心

To investigate the mechanical properties of deep-sea sediments under in situ stress and temperature con-ditions in the laboratory,a self-developed underwater sediment triaxial testing system with precise volumetric measurement capabilities was created.Building upon a geotechnical stress path triaxial testing system,the devel-oped system incorporates a dual water bath circulation design to achieve uniform and precise temperature control of sediment specimens and a dual pressure chamber design to enable high-pressure stress loading and precise volu-metric measurements under deep-sea pressure and temperature conditions.The system was tested for temperature control and triaxial test repeatability,and the results demonstrated stable and precise temperature control over ex-tended durations and reliable volumetric measurements under temperature-controlled conditions.Ottawa sand was used to prepare saturated sandy sediment specimens,and triaxial shear tests were conducted under four temperature conditions.The results indicated that within the range of 5-40℃,decreasing the temperature reduces the shear strength and deteriorates the shrinkage characteristics of the sand.The above tests preliminarily verified the relia-bility of the developed testing system,providing technical support for studying the mechanical properties of deep-sea sediments.