Combined metal shrink ring for lateral restricted expansion test for rock

Abstract

The invention discloses a combined metal shrink ring for a lateral restricted expansion test for a rock. The combined metal shrink ring comprises a split cavity and an open cutting ring. The split cavity is composed of two butted semicircular molds and bolts by connection. A central inner circle of the split cavity is provided with the open cutting ring. The open cutting ring is a stainless steel cylinder provided with a longitudinal opening. The split cavity is graded according to differences of central inner circle diameters. Different grades of the split cavities having the different central inner circle diameters are provided with the corresponding open cutting rings having different wall thickness values. The combined metal shrink ring can satisfy requirements of lateral restriction of rock samples having different diameters in a lateral-restricted rock expansion test, can satisfy lateral-restricted expansion test requirements and can be directly used for rock core drilling in the field. The combined metal shrink ring for a lateral-restricted rock expansion test has structural features equivalent to the existing metal shrink ring and can satisfy technical conditions required by the existing railway rock test standard.

Description

technical field [0001] The invention belongs to supporting equipment for rock expansion test instruments in construction engineering, in particular to a combined metal collar with lateral restraint for rock expansion tests. Background technique [0002] The rock expansion test is a test for various building foundations, slopes, underground projects, and whether the rock used as a building material has expansibility and its various expansibility indicators. The subject content of this application only involves Laterally confined rock expansion rate and expansion pressure tests. [0003] Expansion rate test with lateral restraint refers to a rock sample of a specified shape, which is wrapped and fastened with metal components in the lateral direction so that it does not produce lateral deformation in any state, and then the rock sample is placed in the In a specific immersion container, the bottom of the metal member is permeable and fixed, and the top is preset with a certai...

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Problems solved by technology

[0006] However, due to the different sample preparation process or on-site drilling and sampling conditions, there are often many rock samples that do not conform to the inner diameter specifications of the integral metal collar. There are certain practical difficulties, and because the rock sample will be firmly entangled with the integral metal collar after saturation and expansion, it is very difficult to remove the sample and separate the two. Therefore, in the actual operation of implementing the above procedures, the integral collar with a fixed inner diameter cannot Satisfying the actual situation of the variety of rock sample diameters and the difficulty in separating the sample from the overall collar after expansion affects the smooth progress of the test

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