Circumferential pressure equalization loading device for brittle soft rock, soft rock sampling device and sampling method

Abstract

A brittle soft rock circumferential uniform pressure loading device comprises a bottom plate, vertical partitions, horizontal partitions, elastic loading soft capsules and a loading power; wherein thenumbers of the vertical partitions and the horizontal partitions are both two, the vertical partitions and the horizontal partitions are mutually perpendicularly connected to form a quadrilateral cavity, the quadrangular cavity is mounted on the bottom plate; one elastic loading soft capsule is mounted on each of the vertical partitions and the horizontal partitions, and each elastic loading softcapsule is connected to the loading power by a pipe. A confining pressure is applied to an irregular test piece by hydraulic pressure, trouble caused by an uneven surface and surface defects of the irregular test piece can be eliminated by the elastic loading soft capsules and a flexible cushion layer on the surface of the irregular test piece, and uniform pressure application on the surface of the irregular test piece can be realized. A rock test piece can be completely fixed without causing local stress concentration of the test piece, the development of internal cracks of the test piece during sample drilling can be restrained, the strength of a brittle soft rock test block can be improved, and the drilling rate of a standard sample can be improved. The brittle soft rock circumferential uniform pressure loading device has the characteristics of simple operation, strong adaptability and high standard sample drilling rate.

Description

technical field [0001] The invention discloses a circumferential pressure equalization loading device for brittle soft rock, a soft rock sampling device and a sampling method; in particular, it relates to a circumferential pressure equalization loading device for brittle irregular soft rock, a sampling device and a sampling method for brittle irregular soft rock, belonging to Rock Mechanics Experiment Field [0002] technical background [0003] Soft rock exists widely in nature, and the study of its mechanical properties is of great significance to the healthy and rapid development of my country's hydraulic engineering, mining engineering, road and bridge engineering and other infrastructure and resource mining fields. Laboratory research on the mechanical properties of soft rock requires a standard sample (generally φ50mm×100mm) as the carrier. Cylindrical samples are widely used in rock mechanics experiments because they can eliminate the shape effect of the sample when t...

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Problems solved by technology

For hard rock, this drilling method can achieve good results, but for soft rock, especially brittle soft rock, due to its soft, brittle and brittle characteristics, it is not possible to apply a large preload when fixing the test block Due to the strong stress concentration in the drilling part during the processing, it is easy to cause the cracking and damage of the test block, and it is difficult to obtain an ideal cylindrical sample, which seriously affects the research on the mechanical properties of brittle soft rock.

In addition, because the surface of the irregular soft rock test block is often uneven and there are many defects, the traditional fixing method can easily cause the sample to be not fixed firmly during the sample drilling process, which in turn leads to the breakage of the drilled sample. Even if a sample with a suitable length is drilled, the interior of the sample is subjected to frequent stretching and compression, resulting in changes in the mechanical properties of the sample, which have a great impact on the results of the experiment and restrict the development of the field of soft rock engineering.

[0004] So far, there is no reliable sampling device and method for brittle irregular soft rock, and this has become a technical problem that needs to be solved urgently in this field

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