Abstract:Ocean scientific drilling is an important means of scientific exploration and research of the ocean floor， and has extremely important significance in many fields such as earth science， life science， and resource exploration. Circulation Obviation Retrofit Kit （CORK） is an important supplement to ocean scientific drilling. CORK can achieve the transformation from short-term sampling to long-term dynamic observation of the seabed environment. Over the past few decades， the technological means of underwater observation equipment have also been continuously improved in this process. CORK has derived four new versions based on the initial development of CORK， which have evolved from single layer sampling to multiple layer sampling and can also perform in-situ testing. The new round of ocean drilling program led by our country is about to be implemented， and it is urgent to increase the research and development efforts of CORK technology， use our own resources and talents to build an underwater CORK observation system， and lay a solid foundation for quickly entering the ranks of world maritime powers.

Abstract:In-situ remediation technology has become the mainstream of contaminated site management， but in-situ remediation technology is prone to slurry return， resulting in secondary contamination of the soil. In this paper， we designed a packer for in-situ remediation of contaminated sites using the principle of hydraulic expansion and elastic contraction， which can meet the requirements of the rotary injection process and enable the recycling of the packer. A model of the action mechanism of the packer was developed using FLAC3D， and the radial stress and displacement of the soil layer under different input pressures were analyzed at the microscopic level. The simulation results showed that the effect of the packer on the cohesive soil layer is in the range of about 1.5m. This study provided a reasonable reference for the optimization of in-situ remediation techniques for contaminated sites.