水下沉积物土工力学原位测量技术研究

Study on In-situ Measurement Technology of Geomechanics of Underwater Sediment

针对深海沉积物土工力学参数海底原位测量面临的测量不准、误差大的问题,提出深海高围压下原位极小变量测量方法、深海高围压下非接触式扭力传递技术及海底拖航连续多站位作业技术,并研制了深海沉积物土工力学原位测试系统,在中国大洋54航次、70航次中完成了海底原位测量作业。对中国大洋54航次DY54Ⅲ-A3-TG01站位的原位测量数据和船上实验室测量数据进行了对比分析。结果表明:利用土工力学原位测试系统在同一站位测得的海底原位数据具有较高一致性,但原位测量数据和船上实验室测量数据存在较大差异。水下沉积物土工力学原位测试系统的成功研制对开展深海沉积物原位测量具有重要意义。

In order to solve the problems of inaccurate measurement and large measurement error in the in-situ measurement of the geomechanics parameters in deep-sea sediment,the in-situ minimum variable measurement method under high confining pressure,non-contact torque transmission technology under high confining pressure and continuous multi-station operation technology of seabed towing in deep sea were proposed.The in-situ measurement system of geomechanics in deep-sea sediment was developed,and the in-situ measurement of seabed was completed in the 54th and 70th voyages of China Ocean.The in-situ measurement data of DY54III-A3-TG01 station in the 54th voyage of China Ocean and the laboratory measurement data on board were compared and analyzed.The results show that the in-situ data of seabed measured by the in-situ measurement system of geomechanics at the same station have high consistency,but there is a big difference between the in-situ measurement data and the laboratory measurement data on board.The in-situ measurement system of geomechanics of underwater sediment is of great significance for in-situ measurement of deep-sea sediments.