True triaxial apparatus of unsaturated soil

Abstract

The present invention discloses the true triaxial apparatus of an unsaturated soil, including a host, pore water and a gas pressure controller, a hydraulic load controller and a signal acquisition and processing unit; the host base is equipped with an axial regulating piston, which communicates with the pressure chamber base upward through an axial hydraulic cylinder; the pressure chamber base is enclosed into a pressure chamber upward through the side wall of pressure chamber and the roof; the side of pressure chamber base is provided with four lateral displacement sensors, wherein the probe of each lateral displacement sensor contacts with a lateral deformation measurement guide rod, and four lateral deformation measurement guide rods penetrate into the pressure chamber from four sides to contact with the specimen; an axial pressure sensor is arranged on the cross bar of the host bracket; an axial displacement sensor is mounted on the pole of host bracket. The device provided by the invention has reasonable structure, convenient use, and meets the requirement of unsaturated soil mechanic performance test with true triaxial under controlling and measuring the suction.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering testing equipment, and relates to a true triaxial instrument for unsaturated soil. Background technique [0002] Unsaturated soil is widely distributed in nature. Most of the soil on the earth's surface is in an unsaturated state. In actual engineering practice, unsaturated soil is often encountered, such as earth dams, railway and road embankment fill, and airport runways. The compacted fill is in an unsaturated state. Because there are great differences in engineering properties between unsaturated soil and saturated soil, changes in water content often cause significant changes in engineering properties of soil, which poses a threat to the safety of buildings and structures. [0003] The significance of unsaturated soil research has long been recognized by everyone. Soil mechanics researchers began to consider the problem of unsaturated soil as early as the 1930s. However, due...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a true triaxial instrument for unsaturated soil, which solves the problem of measuring the pore water pressure and pore air pressure of unsaturated soil under the conditions of vertical rigid loading and lateral flexible loading of true triaxial stress. , or it is not easy to control the test of pore water pressure and pore gas pressure, resulting in the problem of insufficient accuracy

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