Testing device and method for gas-containing soil sample consolidation tests and penetration tests

Abstract

The invention discloses a testing device and method for gas-containing soil sample consolidation tests and penetration tests. The testing device comprises a base, a middle ring is connected with the top of the base, an upper ring is mounted at the top of the middle ring, a rubber water bag is arranged at the lower part of the middle ring, a water injection pipe is mounted outside the middle ring,a three-way valve A is communicated with the water injection pipe and communicated with a water inlet pipe and a water outlet pipe, and a pressure sensor B is mounted on the water outlet pipe; a waterflow channel B and a water flow channel C are formed in the middle of the middle ring, a pressure sensor A is connected at the water flow channel B in a closed manner, the water flow channel C is communicated with a three-way valve B through a pipeline A, and the three-way valve B is communicated with a flow measuring pipe and a water supply device through pipelines; a piston is mounted in the upper ring, a top cap is mounted at the top of the piston, and a drain pipeline is formed in the lower part of the top cap and communicated with a liquid metering pipe through a pipeline B; an exhaust pipe is arranged at the top of the top cap. The testing device is suitable for gas-containing soil penetration and consolidation tests, has the advantages of novel structure, lower cost and the like and improves the measurement accuracy of tests.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering geotechnical tests, in particular to a test device and method for consolidation tests and permeability tests of air-bearing soil samples. Background technique [0002] Air-bearing soil generally refers to the soil with closed gas phase, and the gas phase exists in the form of free, dissolved or gas-water compounds, and is generally distributed at the bottom of lakes, estuaries, valley bottoms, deltas, seabeds, and shallow areas with relatively rich oil and gas resources in the formation. Among them, the gas-bearing soil rich in shallow gas and the gas phase exists in the phase of free bubbles generally has the characteristics of high water content, dissolved and saturated gas phase, gas pressure higher than atmospheric pressure, small permeability coefficient, and a metastable equilibrium state. In the field of geotechnical engineering, little is known about this kind of air-bear...

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Problems solved by technology

The device can be applied to air-bearing soil, and can be used for gas sealing and water-gas separation in the consolidation process and independent measurement; however, this device cannot realize the permeability test of air-bearing soil, and is more complicated in operation, which is not conducive to the air-bearing soil. Accurate and rapid measurement of air-soil sample consolidation test and permeability test

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