High-pressure triaxial acoustic testing system

Abstract

The invention belongs to the technical field of sediment acoustics and particularly relates to a high-pressure triaxial acoustic testing system. According to the high-pressure triaxial acoustic testing system, a pressure chamber is a vertical cabin, and the upper end and the lower end of the cabin are provided with an upper end cover and a lower end cover respectively; the upper end cover is provided with a spoke type pressure transmitter and an exhaust hole; the lower end cover is provided with a water filling / draining hole, a confining pressure loading hole, a counter pressure loading hole,a hole pressure detecting hole and a watertight cable connecting hole; the lower end cover is connected with a confining pressure loading system, a counter pressure loading system and an axial loadingcylinder, wherein the axial loading cylinder is connected with an axial pressure loading system; a sample testing unit is arranged inside the cabin. The high-pressure triaxial acoustic testing systemcan achieve sound velocity and attenuation measurement of bottom sediment samples under pressure combined environments different in confining pressure, axial pressure and counter pressure and environments of consolidated undrained test, consolidated drained test and unconsolidated undrained test, and meanwhile, can achieve synchronous measurement of pore water pressure, and axial deformation andsize deformation of the bottom sediment samples under different pressure environment conditions.

Description

technical field [0001] The invention belongs to the technical field of submarine acoustics, and in particular relates to a high-pressure three-axis acoustic testing system. technical background [0002] Seabed sediments occur in different water depths and buried depths, and their geoacoustic properties are jointly affected by the seabed depositional environment (stress, temperature, chemistry, etc.) and sediment physical and mechanical properties (particle arrangement, skeleton structure, porosity, etc.) . Among them, the influence of stress environment on the geoacoustic properties of seabed sediments is an important scientific problem to be solved in the study of seabed acoustics. The stress environment of seabed sediments is composed of two parts: one is the hydrostatic pressure stress environment acting on the seabed determined by water depth (water depth stress environment); the other is the in-situ stress environment generated by the self-weight of overlying sediments...

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Problems solved by technology

[0004] However, at present, the measurement of sediment acoustic properties under stress environment is generally aimed at shear modulus and shear wave velocity, and there are few measurement systems for compressive wave velocity under stress environment, which is generally concerned by marine geologists.

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