ABSTRACT

Deep sea cone penetration testing has played an increasingly important role in marine engineering geological survey. In view of the harsh and complex environment of the deepsea, the pressure resistance performance of the cone penetration testing probe plays a vital role in the normal operation of the equipment. In addition, the influence of the deepsea water pressure on the static penetration parameters cannot be ignored. This paper, through finite element simulation, The influence of hydrostatic pressure on the probe and its measurement in the deep sea working environment is discussed.

INTRODUCTION

Natural gas hydrate, also known as combustible ice, is a solid substance composed of water, methane, and other gases under high pressure and low temperature. It is a new, high-energy-density fuel source, boasting 10 times the energy density of coal or carbonaceous shale and twice that of conventional natural gas (Chen, 2020). Due to the harsh conditions required for its formation, natural gas hydrates are mostly found in polar seafloor sediments (in the shallow water areas) and continental slope sediments (in the deep water areas). Changes in temperature or pressure in the sediment layer where natural gas hydrates occur can compromise their structural stability, leading to explosive decomposition, collapse, submarine landslides, and other seabed geological disasters that can inflict significant damage on underwater engineering structures, such as submarine cables (Chen, 2020).

Therefore, it is an indispensable step before exploration and exploitation to obtain the soil property parameters of the sediment layer rich in natural gas hydrate. The investigation and study of the properties of marine soil is an essential part of the construction of offshore oil platforms, subsea tunnels, oil and gas pipelines, optical cables and other marine engineering. The study of the properties of sediment within a few meters to tens of meters below the seabed is of great significance to the marine environmental investigation, seabed resource exploration, marine development and utilization, and other aspects.

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