【摘要】 为实现海底沉积物在原位环境的模拟测量，设计海底环境模拟三轴加压系统。通过围压、反压、轴压3个加压单元，组合实现模拟海底沉积物所受的水深压力和埋深压力。建立液压加压单元的数学模型，通过水介质的割线体积弹性模量方程得出不同条件下水的体积弹性模量，研究不同温度、压力和海水盐度对加压系统加压性能的影响。经过分析与测试得出：每1℃温度变化、每1 MPa压力变化、每1‰盐度变化对加压系统加压效果的影响分别为0.36%、0.14%、0.21%;通过模拟环境波动引发水的体积弹性模量变化，导致测试仓产生0.6 MPa压力扰动变化，系统自动恢复稳定状态的调节时间不超过5 s。实验表明系统的超调量小于0.05 MPa, 1～10 MPa的保压10 min内测试压力波动不超过±0.005 MPa。系统的压力控制特性和抗干扰性好，满足测量要求。更多还原

【Abstract】 In order to realize the simulation measurement of seabed sediment in situ environment, the seabed environment simulation triaxial compression system was designed.Through the three pressure units of confining pressure, back pressure and axial pressure, the water depth pressure, buried depth pressure of seabed sediments were simulated.The mathematical model of the hydraulic pressurization unit was established, and the bulk elastic modulus of water under different conditions was obtained through the secant bulk elastic modulus equation of the water medium.The effect of different temperature, pressure and seawater salinity on the pressurization performance of the pressurized system was studied.After analysis and test, it is concluded that the influence of temperature change per 1 ℃,pressure change per 1 MPa, and salinity change per 1‰ on the compression performance of the pressurized system is 0.36%,0.14%,and 0.21% respectively.By simulating the elastic modulus change of water volume caused by environmental fluctuation, the 0.6 MPa pressure disturbance changes in the test bin, and the adjustment time for the system to automatically restore the stable state should not exceed 5 s.The experiments show that the overshoot of the system is less than 0.05 MPa, and the test pressure fluctuation within 10 min from 1 MPa to 10 MPa does not exceed ±0.005 MPa.The system pressure control characteristics and anti-interference performance are good, meeting the measurement requirements.更多还原