A device and method for producing true triaxial geotechnical specimens with different fracture geometric parameters

Abstract

The invention belongs to the field of rock and soil mechanics, and provides a device and method for preparing true triaxial rock and soil test pieces with different geometric parameters of cracks. A true triaxial rock-soil test piece device for preparing different geometric parameters of cracks, comprising: a fixed support frame component, a crack position control component, a crack angle control component, and a crack depth control component. The crack position control component is fixedly connected with the fixed support frame component. The slit angle control component and the slit position control component are hinged through a ball joint. The crack depth control component is fixedly connected with the crack angle control component. The device and method of the present invention can meet the preparation of true triaxial fracture rock-soil test pieces with different crack positions, different crack inclination angles, different crack depths and different crack lengths by adjusting each component of the device, which improves the true triaxial crack rock-soil test specimens. The preparation accuracy of the parts has the advantages of unique structure, reasonable structure, convenient operation, economical and durable.

Description

technical field [0001] The invention belongs to the field of rock and soil mechanics, in particular to a device and method for preparing true triaxial rock and soil test pieces with different geometric parameters of cracks. Background technique [0002] In engineering practice and in nature, natural fractured rock mass or fractured soil mass is usually in a three-dimensional stress field formed by self-weight stress and tectonic stress and is in a stable state. When excavating fissure rock mass or fissure soil, the balanced three-dimensional stress field is broken. At this time, the fissure rock mass or fissure soil will form local stress concentration and stress release near the fissure, and the fissure rock mass or fissure soil The stress in the body will undergo complex stress path changes such as unloading, loading, and combination of loading and unloading, so the stress status of cracked rock mass or cracked soil mass is very complicated. Simulate the mechanical proces...

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Problems solved by technology

When making a true triaxial sample, the current method has the following disadvantages: Since there is no binding force around the iron sheet, when the iron sheet is inserted into a complete true triaxial sample, the iron sheet is prone to severe deflection and the iron sheet It is difficult to determine the insertion depth accurately and intuitively; when determining the inclination angle of the crack, it is determined by artificially marking the surface of the complete true triaxial sample, and the inclination angle of the crack is not accurate enough; when making cracks of different lengths, it is necessary to pull out and insert the iron sheet many times , the error accumulated many times caused the produced crack to be not straight enough in the length direction

[0005] 1) Serious deflection easily occurs when the iron sheet is inserted, and the insertion depth of the iron sheet is difficult to determine accurately and intuitively;

[0006] 2) The prepared crack inclination is not accurate enough;

[0007] 3) Errors accumulated many times cause the cracks produced to be not straight enough in the length direction;

[0008] 4) It is impossible to accurately control the insertion depth of the insert, and it is difficult to accurately locate the crack position without crack position control components

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