Triaxial test soil unit central position pore water pressure test system

Abstract

The invention relates to a triaxial test soil unit central position pore water pressure test system. The system comprises a pressure chamber and a loading cylinder at the top of the pressure chamber,wherein the upper end and the lower end of the pressure chamber are provided with a pressure chamber air inlet / outlet pipe and a pressure chamber water inlet / outlet channel respectively; a soil unit is placed inside the pressure chamber and is clamped up and down through a soil unit pressurization upper cap and a soil unit base; a displacement sensor is arranged at the top of the loading cylinder,a cylinder pressure head is arranged at the bottom of the loading cylinder, and the cylinder pressure head is inserted into the pressure chamber and covers the soil unit pressurization upper cap; a force sensor is arranged below the soil unit base; and a micro pore water pressure sensor is arranged at the central position of the soil unit. The system is simple an compact in structure, low in cost, convenient to assemble and easy to operate, a computer can be controlled to directly and objectively measure, monitor and display the pore water pressure changing process of the soil unit through atest and draw a pore water pressure-vibration curve, and the measurement result has the advantages of being comprehensive and accurate.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a pore water pressure testing system at the center of a triaxial test soil unit. Background technique [0002] In soil mechanics, the deformation and strength of the soil after being stressed depend on the effective stress of each broken granular material in the soil, that is, the pressure difference between the total stress on the soil and the pore water pressure. When using triaxial tests to study the engineering properties of soil, such as strength and deformation characteristics, it is necessary to objectively and accurately capture and record the change of pore water pressure in the soil unit during the test. [0003] When the existing triaxial test device measures the pore water pressure in the soil unit, the pore pressure sensor is often placed on the bottom, top or side of the test soil unit. Due to the restraint of the top hat and the base on the soil unit, the s...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of pore water pressure testing system at the central position of a triaxial test soil unit, which can directly measure the pore water pressure in the middle of the soil unit, and can complete the static triaxial test or cyclic triaxial test under the stress control or strain control mode, Overcome the shortcomings of the existing triaxial test system that cannot truly and objectively measure the pore water pressure in the soil unit during the triaxial test

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