Pressure chamber for rock-soil rheological test

Abstract

The invention relates to a pressure chamber for a rock-soil rheological test, which comprises an axial pressure chamber and an annular pressure chamber, wherein the axial pressure chamber comprises an upper pressure chamber, a test-piece chamber and a lower pressure chamber, which are sequentially laminated, a rock-soil test piece is placed inside the test-piece chamber, oil with adjustable pressure is respectively inputted into the annular pressure chamber, the upper pressure chamber and the lower pressure chamber, the annular pressure chamber surrounds the axial pressure chamber in the radial direction, and the axial pressure chamber is formed by an internal space of an elastic jacket. The annular pressure chamber is separated from the axial pressure chamber in the pressure chamber through the elastic jacket, so that the axial pressure and the radial pressure of the rock-soil test-piece in the pressure chamber can be absolutely isolated, and the axial pressure and the radial pressure born by the rock-soil test piece in the test-piece chamber can be independent from each other.

Description

technical field [0001] The invention relates to a pressure chamber for rheological tests of rock and soil. Background technique [0002] The rheological properties of rock and soil mainly include creep characteristics and force relaxation characteristics. The study of rheological properties of rock and soil is very important for the quality control of geotechnical engineering, safe operation, soft rock support and rock and soil mechanics research, especially for deep rock and soil Engineering and geomechanics are more important. The research on the rheological characteristics of rock and soil mainly focuses on the study of the failure mechanism of rock and soil, so as to promote the improvement of quality control, safe operation and soft rock support level of geotechnical engineering. At present, the rheological test of rock and soil mainly uses a triaxial rheometer, which can exert pressure on the radial and axial directions of the rock and soil, but the radial pressure an...

AI Technical Summary

Problems solved by technology

At present, the rheological test of rock and soil mainly uses a triaxial rheometer, which can exert pressure on the rock and soil in the radial and axial directions, but the radial pressure and the axial pressure interfere with each other, so the axial Pressure and radial pressure cannot be independent

In the actual failure process of rock and soil, rock and soil tension and shear stress are the main reasons for rock and soil damage. During the rock and soil tension process, the axial force is smaller than the radial force, and the current triaxial rheometer It can realize that the axial force of the rock and soil specimen is greater than the radial force, because when the traditional triaxial rheometer is used for the triaxial test, the entire specimen bears the working oil pressure inside the pressure chamber (customarily called hydrostatic pressure) -"Archimedes' Law"), the axial pressure of the specimen includes the pressure inside the pressure chamber in addition to the pressure exerted by the axial loading system. When the pressure of the axial loading system is zero, the axial pressure of the specimen still bears the pressure inside the pressure chamber working oil pressure, it is impossible to realize that the radial pressure of the specimen is greater than the axial pressure, so it is impossible to simulate the stress field when the rock and soil are stretched, which greatly reduces the reference value of the rock and soil rheological test results

[0003] In addition, each group of rock and soil creep tests requires at least 5 specimens, and the test for each specimen ranges from dozens of hours to hundreds or even thousands of hours. It often takes several months to complete a set of tests, not only Delayed engineering requires the acquisition of data and consumes considerable manpower and financial resources

Using multiple sets of test equipment to conduct tests at the same time can reduce the period of completion of the test, but each set of test equipment needs to be equipped with an oil supply system, a power system and a test bench, all of which require high manufacturing costs, thus greatly increasing the cost of rock and soil. The cost of rheological testing, and a great waste of energy, is neither economical nor environmentally friendly

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