Self-balancing rock full end face true three-axial compression test apparatus

Abstract

The invention discloses a self-balancing rock all-end-surface true triaxial compression test device, which consists of a triaxial pressure chamber, a four-link-plate mechanism, a sigma 1 loading transfer system, a sigma 2 loading transfer system and a sigma 3 loading transfer system. The device is characterized in that the sigma 1 loading transfer system is positioned at an upper end of the triaxial pressure chamber and is connected with the triaxial pressure chamber through a piston in a sigma 1 direction; the sigma 2 loading transfer system is positioned at the side end of the triaxial pressure chamber and is connected with the triaxial pressure chamber through a piston in a sigma 2 direction; the sigma 3 loading transfer system is connected with the triaxial pressure chamber through a drain hole and a water inlet hole; and the four-link-plate mechanism is positioned inside the triaxial pressure chamber. The device can perform a plurality of tests on various rocks, and perform true triaxial compression tests on most of soluble rocks and undissolved rocks. The device can apply unidirectional pressure through water solution, and can perform a stress-dissolution coupling test on the soluble rocks. The device can apply the stress on all end surfaces of a rock specimen to truly reflect the load bearing state of a rock body; and the test device has a simple structure, is easy to operate, and has a self-balancing function.

Description

technical field [0001] The invention relates to the technical fields of geology and rock mass engineering, and more specifically relates to a self-balancing rock full-face true triaxial compression test device, which is mainly used for studying the basic mechanical properties of rocks and the stress of soluble rocks under complex combined stress states - Dissolution coupling characteristics, test results can be applied to geosciences and rock mass engineering research and rock mechanics. Background technique [0002] Under natural conditions, the crust and engineering rock mass are deformed and destroyed under complex combined stress states. Rock mass is a complex geological body, which is in a complex three-dimensional stress field, and the failure of rock mass is usually caused by the change of its existing stress state. Conventional triaxial rock mechanics tests generally apply a certain confining pressure to the rock, and then keep the confining pressure constant (i.e. ...

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Problems solved by technology

The oblique section of the pressure plate can expand the deformation range of the rock specimen, but due to the small space between the oblique section pressure plates in different directions, the measurement range of the test device is still small, and the deformation range is small, so it is not suitable for large deformation. rocks, which limits the scope of application of the test device

[0010] (3) The full-end stress is applied to the rock specimen, but due to the interaction between the pressure plates in different directions, the friction between the rock specimen and the pressure plate is large, which is inconsistent with the actual stress state of the rock

[0011] 2. The test instrument does not have the "self-balancing" function in structure, that is, the test device cannot realize the balance between the loading force and the reaction force from its own structural design, which causes the test instrument to use a huge load-bearing column to bear the load due to For the reaction force generated, the size of the test device is large, the instrument is bulky, the stress is applied in a single way, the operation is difficult, and the test operation by manpower is difficult and the safety is poor.

[0012] 3. Some rock triaxial compression test devices are designed to limit the function of the device, and the function of the test instrument cannot be expanded well, especially the stress-dissolution coupling test of rock specimens cannot be carried out.

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