Fake triaxial creeping device and method for geotechnical engineering under uniform confining pressure

Abstract

The invention discloses a fake triaxial creeping device for geotechnical engineering under a uniform confining pressure. The fake triaxial creeping device comprises a force applying device, wherein the force applying device is contacted with one end of a test piece needing to be tested by a pressure sensor; readings of a control sensor guarantee that an applied axial force of the force applying device is constant; a rubber ring covers the outer part of the test piece so as to ensure that the confining pressure is applied uniformly and vertically; a sheet-shaped flexible material piece is uniformly wound at the outer part of the rubber ring; one end of the sheet-shaped flexible material piece is fixedly arranged on a clamp and the other end of the sheet-shaped flexible material piece is movably connected to a loading device; a uniform pull force on the sheet-shaped flexible material piece finally acts on the test piece by the loading device to finish the application of the confining pressure. The invention simultaneously discloses an operation method of the device. The fake triaxial creeping device can effectively guarantee that the confining pressure is applied uniformly and vertically; the experiment efficiency is improved and the experiment operation is convenient.

Description

technical field [0001] The invention relates to a geotechnical engineering technology, in particular to a pseudo-triaxial creep device and method for geotechnical engineering under uniform confining pressure. Background technique [0002] At present, creep refers to the phenomenon that the strain of solid materials 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] At present, the creep phenomenon of rock and soil has been deeply studied at home and abroad, and corresponding experim...

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Problems solved by technology

[0004] At present, the creep phenomenon of rock and soil has been deeply studied at home and abroad, and corresponding experimental devices have emerged. Uniaxial creep test devices are more common, but they cannot accurately describe the actual stress state of the specimen. The variable testing machine uses oil pressure to apply circumferential pressure, which is extremely cumbersome to operate and consumes manpower and material resources. Other devices are only approximate approximations of confining pressure, which cannot achieve uniform pressure in the circumferential direction, and it is difficult to achieve the current creep test.

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