Device and method for measuring actual triaxial creep of geotechnical engineering test specimen

Abstract

The invention discloses a device for measuring actual triaxial creep of a geotechnical engineering test specimen. The device comprises a support structure, and also comprises four confining pressure plates, an upper compression plate and a lower compression plate so as to form a closed cavity for wrapping a test specimen, wherein the confining pressure plates comprise two long confining pressure plates and two short confining pressure plats, the upper compression plate and the lower compression plate are a rectangular top steel plate and a rectangular bottom steel plate, the two outwards-bent L-shaped long confining pressure plates are overlapped on two adjacent side surfaces of the bottom steel plate, the two outwards-bent L-shaped short confining pressure plates are overlapped on the other two side surfaces of the bottom steel plate, the bottom ends of the short of the bottom steel plate plates are arranged on the bottom steel plate, the top steel plate is overlapped at the top ends of the long confining pressure plates, the top steel plate is clung to the inner side surfaces of the two short confining pressure plates, pressure sensors corresponding to the four confining pressure plates and the upper compression plate and the lower compression plate are vertically arranged inside the support structure, and grating rulers are arranged on the pressure sensors. The invention also provides a method for measuring the actual triaxial creep of the geotechnical engineering test specimen by using the device.

Description

technical field [0001] The invention relates to a device and method for measuring the true triaxial creep of a geotechnical engineering test block. Background technique [0002] Creep refers to the phenomenon that the strain of a solid material increases with time under the condition of keeping the stress constant. It is different from plastic deformation, which usually occurs after the stress exceeds the elastic limit, and creep can occur when the stress is less than the elastic limit, as long as the stress is applied for a long time. [0003] Creep phenomenon is very common in geotechnical engineering, and many geotechnical engineering disasters are also closely related to rock and soil creep, such as landslides, landslides, foundation settlements, etc. Important guarantee. [0004] In the past, creep tests in geotechnical engineering often stayed on uniaxial and pseudo-triaxial tests. The uniaxial test ignored the influence of the confining pressure of the test block, a...

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Problems solved by technology

[0004] In the past, creep tests in geotechnical engineering often stayed on uniaxial and pseudo-triaxial tests. The uniaxial test ignored the influence of the confining pressure of the test block, and the pseudo-triaxial test ignored the inequalities of the pressure in each direction of the test block. These cannot accurately reflect the real force and creep behavior of rock and soil under actual conditions.

True triaxial creep test instruments for rock and soil at home and abroad are very rare, with very complex structures, relatively large scale, cumbersome operations, and expensive prices, and are only used in high-strength creep tests. For triaxial creep tests under low-strength conditions often loses accuracy

At present, the research on the creep phenomenon of rock and soil under low strength conditions is relatively lacking.

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