| CPC G01N 13/00 (2013.01) [G01N 33/24 (2013.01)] | 14 Claims |
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1. An experimental apparatus for studying an interfacial shear characteristic between a hydrate-bearing sediment and a structure, the apparatus comprising a triaxial shear pressure cell, a torsional and axial loading device, a methane gas source, a first pressure-volume controller, a water bath device, a second pressure-volume controller, an oil tank, a back pressure valve, a gas-water separator, a gas flowmeter, and a data acquisition system, wherein
the triaxial shear pressure cell comprises a pressure chamber upper cover, a high-pressure sealing cover and a lower rotating base disc, wherein the pressure chamber upper cover, the high-pressure sealing cover and the lower rotating base disc are arranged in sequence from top to bottom to form a sealed pressure chamber; the pressure chamber upper cover and the lower rotating base disc are detachably connected through a plurality of locking lead screws; a water bath jacket communicated with the water bath device is provided around the high-pressure sealing cover; a thermal insulation plate and a lower pressing plate are arranged in sequence below the lower rotating base disc; a top cap, a specimen assembly and a base are coaxially arranged from top to bottom in the sealed pressure chamber; the specimen assembly is clamped by a plurality of fixing screws between the top cap and the base; the base is fixed at a bottom of the sealed pressure chamber, and a cylindrical hole passes through a central-axis position of the base; a loading rod is vertically provided, with a lower part passing through the top cap and the specimen assembly, a bottom extending into the cylindrical hole of the base, and a top protruding from the pressure chamber upper cover and detachably connected to an upper fixed disc; a top of the upper fixed disc is connected to an upper pressing plate; the lower rotating base disc is provided with an exhaust channel, a confining pressure control channel, a temperature sensor channel, an intake channel and a drainage channel, wherein the exhaust channel, the confining pressure control channel, the temperature sensor channel, the intake channel and the drainage channel are communicated with the sealed pressure chamber; the exhaust channel is connected to a fourth valve, the back pressure valve, the gas-water separator, and the gas flowmeter in sequence through a first tubing; the confining pressure control channel is externally connected to a second tubing having a third valve, and a tail end of the second tubing is connected to the second pressure-volume controller and the oil tank in parallel; the temperature sensor channel houses a temperature sensor for measuring an internal temperature of the sealed pressure chamber; the intake channel is communicated with the methane gas source through a third tubing having a second valve, and the third tubing is communicated with the first pressure-volume controller through a branch having a first valve; and the drainage channel communicates the cylindrical hole of the base to an outside; and
the torsional and axial loading device comprises an axial actuator located at an upper end and fixedly connected to a top of the upper pressing plate and a torsional actuator located at a lower end and fixedly connected to a bottom of the lower pressing plate; the axial actuator, the triaxial shear pressure cell, and the torsional actuator are coaxially arranged; and the data acquisition system is connected to the first pressure-volume controller, the temperature sensor, the second pressure-volume controller, the water bath device, and the torsional and axial loading device.
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