Stress path automatic controlling triaxial apparatus

Abstract

The invention discloses a stress path automatic controlling triaxial apparatus comprising a pressure controlling device, a data measuring and collecting apparatus, a common triaxial apparatus, and a microcomputer. An input terminal of the pressure controlling device is connected to the microcomputer. An output terminal of the pressure controlling device is connected to the common triaxial apparatus for transmitting pressure load. An input terminal of the data measuring and collecting apparatus is connected to the common triaxial apparatus for transmitting analogue signals of displacement, pressure, and volume change. An output terminal of the data measuring and collecting apparatus is connected to the microcomputer for recording data. According to the invention, on a basis of a common triaxial apparatus, a function of a stress path automatic controlling experiment is realized, such that complicated stress path experiments can be carried out. With an additional axial pressurizing cylinder, a tensile experiment can be carried out by using the common triaxial apparatus. During an experiment process, ambient pressure and axial pressure can change automatically, and the measuring and collecting processes of the data are automatic. Therefore, the apparatus provided by the invention is characterized in enhanced function and simple operation.

Description

technical field [0001] The invention relates to a device in the field of civil engineering indoor test technology, and in particular to a stress path automatic control triaxial instrument. Background technique [0002] When establishing the constitutive model of soil, the plastic yield surface equation must be determined first. The stress path test is an important means to obtain the plastic yield surface, and the test equipment is required to be able to automatically control the load to obtain various stress paths that meet the requirements. [0003] The most commonly used instrument matrix in stress path testing is a conventional triaxial instrument. The conventional triaxial instrument is mainly used to measure the strength index, stress-strain relationship and stress path of soil. It is an intuitive, simple, reliable and effective experimental equipment. Since its successful development in 1930, after more than 70 years of development, it has been widely used in the fi...

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Problems solved by technology

[0004] However, the general conventional triaxial instrument has its limitations: it can only perform strain control experiments, and the motor drives the pressure chamber to rise at a certain rate to achieve axial stress loading, and cannot perform stress control experiments; the size of the confining pressure needs to be manually controlled, which is inconvenient Continuously changed during the experiment

However, this technology does not involve the technology of automatic control of stress path

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