关键词: 沉积物贯入强度, 强磁传导, 原位测试, 载人潜水器

Abstract:  Sediment penetration test was an important in-situ testing technique for deep-sea sediment strength. In view of the extreme environmental characteristics of the 7000 meter deep sea and the scientific demands for fine in-situ measurement， a deep-sea non-contact strong magnetic sediment penetration strength in-situ measurement device was developed based on the Jiaolong manned submersible， which broke through the problem that the original penetration measurement techniques in the 7000 meter deep sea structure was complex and could not achieve in-situ and fine measurement， A new method of solving deep-sea pressure resistance and strain gauge deformation conduction was proposed based on the non-contact principle of permanent magnetic force balance conduction of manned submersible. The prototype development and deep-sea sea tests were completed， and good test results were obtained. The whole system adopted self-contained working mode to collect and store data， and might be connected with the computer to realize in-situ data reading. The operating water depth is as 7000 m， the maximum penetration depth is as 250 mm， the measuring range is as 0～100 kPa， and the accuracy may reach 5%~10% FS(full scale). In March 2021， the Jiaolong manned submersible completed 5200 m and 6650 m sea trials in 181 and 185 dives in the Parihivila basin， and successfully obtained geotechnical data. 

Key words:  , sediment penetration, strong magnetic conduction, in-situ test, manned submersible