Stepless adjustable shearing box suitable for square structural surface with equal height and random plane size

Abstract

The invention relates to a stepless adjustable shearing box suitable for a square structural surface with an equal height and a random plane size. The box comprises an upper disc shearing box body forinstalling an upper disc structural surface sample and a lower disc shearing box body for installing a lower disc structural surface sample, and the structure of the upper disc shearing box body is identical to that of the lower disc structural surface sample; the upper shearing box body comprises an upper shearing box base and four upper shearing box stepless supporting bases, reversed-T-shapedlimit guide grooves are formed in the four top corners of the upper shearing box base and are the first upper shearing box sliding guide groove and the second upper shearing box sliding guide groove respectively, and the two guide grooves are perpendicular to each other; the upper shearing box stepless supporting bases are composed of upper limit plates, upper base plates, upper connection shafts,upper fixing bolts and upper fixing plates, each upper base plate is provided with two upper fixing holes with screw threads, and the four stepless supporting bases are symmetrically inserted in thefirst upper shearing box sliding guide groove and the second upper shearing box sliding guide groove respectively. The stepless adjustable shearing box is good in testing effect, convenient to operate, short in construction period, low in manufacturing cost and small in occupation space.

Description

technical field [0001] The invention relates to a stepless adjustable shear box suitable for a square structural surface with equal height and arbitrary plane size, suitable for direct shear tests of any square structural surface within the maximum testable size range, and belongs to the field of engineering technology. Background technique [0002] In human engineering activities, engineering accidents caused by rock mass deformation and instability emerge in endlessly, causing huge loss of life and property. The study of the size effect of rock discontinuities is of great significance to guide the stability of rock mass engineering. To conduct direct shear tests on rock discontinuities of a series of sizes, a shear box of the corresponding size is required. The usual practice is that each A rock structural surface sample of different sizes requires a shear box matching the size of the sample. This method not only requires a large number of shear boxes, high cost, and takes...

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Problems solved by technology

[0003] In order to overcome the disadvantages of conventionally adopting a series of shear boxes of various sizes in the shear strength size effect test of the structural surface, such as a large number, complicated procedures, long test period, and large space occupation, the present invention provides a The stepless adjustable shear box with a square structure surface has the characteristics of good test effect, convenient operation, short construction period, low cost, and small space occupation.

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