Vacuum consolidation test device of unit soil sample under triaxial state

Abstract

The invention discloses a vacuum consolidation test device of a unit soil sample under the triaxial state. Liquid is injected to an outer cylinder; a confining pressure sensor is arranged in a chamber between the outer cylinder and an inner cylinder; the matching positions between a base and the outer cylinder and between a top cover and the outer cylinder are in liquid seal; the inner cylinder is arranged in the outer cylinder; a soil sample is arranged in the inner cylinder; a pore water pressure sensor is arranged on the soil sample; an exhaust water pipe is arranged in the soil sample; a through hole is formed in the side surface of the exhaust water pipe; the lower end of the inner cylinder is provided with an outer cylinder substrate; the upper end of the inner cylinder is provided with a piston plate; the piston plate is connected with a lifting shaft; the lifting shaft upwardly penetrates through the top cover; the upper end of the lifting shaft is provided with a pressure plate; the upper end of a main shaft is provided with a settlement gauge; a pressurizing hole is connected with a pressurizing device; the upper end of the exhaust water pipe is connected with a vacuumizing device through a vacuumizing pipeline; the base is provided with a water inlet pipeline conducted by an exhaust water plate; the water inlet pipeline is connected with the water inlet hole which is at the outer side; and the water inlet pipeline is provided with a water inlet pressure sensor. The test device disclosed by the invention can complete a soil sample pore water pressure change test under vacuum preloading, a soil sample settlement test and various testes under a pile loading condition. The test device disclosed by the invention can also be used for an exhaust water plate discharge capacity test experiment.

Description

technical field [0001] The invention relates to a vacuum consolidation test device for a unit soil sample in a triaxial state, in particular to the experimental research on the void water pressure of a soil sample when a circular drainage board is used at a fixed vacuum degree. . Background technique [0002] Before the present invention, the vacuum consolidation test device for unit soil samples under the triaxial state was very immature, and the test device only included three parts: vacuum pressure system, confining pressure pore pressure monitoring system and settlement monitoring. Most of the indoor soil unit model tests are mainly carried out on equipment such as dynamic triaxial instruments and hollow cylinder torsion instruments. The research objects of these tests are all soil samples. By analyzing the characteristics of the soil sample unit in the test environment, the mechanical properties and deformation laws under vacuum preloading are indirectly studied. This...

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Problems solved by technology

The actual situation of the soil sample is also different, which causes a large difference between the experimental research results and the actual measurement results.

At the same time, many parameters cannot be monitored and observed

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