Low-temperature dynamic triaxial apparatus

Abstract

The invention relates to the field of civil engineering, and particularly to a low-temperature dynamic triaxial apparatus. A confining pressure direct interface and a pore water pressure measuring interface are respectively formed in the side surface of a chassis, a footwall cold bath loop inlet and a footwall cold bath loop outlet are respectively formed in the side surface of a footwall base, an interior shaft chamber is arranged above the footwall base, a hanging wall cap is arranged at the top part of the interior shaft chamber, an exterior shaft chamber is arranged at the periphery of the interior shaft chamber, a cold bath loop chamber is arranged at the periphery of the exterior shaft chamber, a peripheral cold bath loop inlet and a peripheral cold bath loop outlet are respectively formed in the side surface of the cold bath loop chamber, a hanging wall cold bath loop inlet and a hanging wall cold bath loop outlet respectively penetrate the exterior shaft chamber, the cold bath loop chamber and two sides of hanging wall cap, a piston is arranged above the hanging wall cap and is fixed through a ball screw, and a pressure chamber upper cover is arranged at the periphery of the piston. The low-temperature dynamic triaxial apparatus has the following advantages that the temperatures of the top end and the bottom of the soil sample can be controlled, the soil sample freezing process can be simulated, the freezing and thawing state of the soil sample is kept, the temperatures of different parts of the soil sample are monitored, and the deformation and the strength of the soil sample are measured.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a low-temperature dynamic triaxial instrument. Background technique [0002] In recent years, with the construction of a large number of expressways in my country and the expansion and reconstruction of existing roads, the traffic volume and the intensity and frequency of dynamic loads have been greatly increased, and the requirements for the stability of roadbed deformation are also getting higher and higher. Greater attention must be given to deformation induced by action and subsequent weakening of subgrade strength by melting. In-depth research on the impact of highway, especially the dynamic load of expressway vehicles on subgrade frost heave deformation and subsequent mud pouring, research on new standards for anti-freezing damage of subgrade fillings, research on construction and maintenance technology for road subgrades in cold regions under dynamic load conditions, and re...

AI Technical Summary

Problems solved by technology

[0004] (1) The temperature cannot be adjusted and set, and the soil sample cannot be controlled to maintain a constant temperature and frozen state;

[0005] (2) The process of natural freezing of soil samples cannot be simulated

This cannot be achieved with existing dynamic triaxial instruments

[0006] Therefore, the existing dynamic triaxial instrument cannot meet the needs of simulation of frozen soil behavior under dynamic load conditions, cannot simulate the freezing process of soil samples, maintain the state of soil samples, and cannot effectively test the dynamic parameters of frozen soil. Development of dynamic triaxial instrument for frozen soil

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