A kind of preparation method of soft rock undisturbed sample
A production method and soft rock technology, which is applied in the field of rock mechanics testing, can solve the problems of inability to produce standard cylindrical samples of soft rock with a specific size, and achieve the effects of saving resources, high success rate of sample preparation, practical and convenient
Inactive Publication Date: 2018-08-28
HEFEI UNIV OF TECH
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Problems solved by technology
[0005] The purpose of the present invention is to solve the problem that the traditional method cannot make a standard cylindrical sample of soft rock with a specific size, and to provide a method for making the original sample of soft rock
Method used
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Embodiment
[0065] The following steps are taken to make a cylindrical soft rock sample with a diameter of 3.91 cm and a height of 8 cm for the triaxial test:
[0066] Step 1: Determine the size and error range of the undisturbed soft rock cylinder sample to be prepared. This test determines the sample diameter
[0067] D=3.91cm, height H=8cm, error range: error range: D, H±0.05cm.
[0068] Step 2: Prepare the cutting mold. Cut a hollow Q235 steel pipe with an inner diameter of 4.1cm, a height of 10cm, and a wall thickness of 0.4cm into a semicircular tubular shape, and grind one port into a sharp knife-edge shape.
[0069] Step 3: Cut the rock sample. Place both ends of the rock sample flat, and use a wire saw to cut the large piece of soft rock into small pieces of rock. The small piece of soft rock is close to a cuboid, and the lengths of the two short sides are similar. The short side length is 2.0-3.0 cm larger than the diameter D=3.91 cm, and the long side of the cuboid is 2.0-4...
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The invention relates to a manufacturing method of a soft rock undisturbed sample. The manufacturing method comprises the following steps: predetermining the size and error range of a soft rock cylindrical undisturbed sample; manufacturing a semi-circle cutting mould; cutting a large rock into small rock samples, whose size is larger than the predetermined size; cutting the rock sample into a roughly cylindrical shape, finely cutting the rock sample by the semi-circle cutting mould until the diameter is close to the predetermined size, finely grinding the rock sample until the diameter is in the error ranged, grinding two ends of the rock sample to the predetermined sized, wrapping the rock sample by a preservative film, and saving the rock sample for later use. In the prior art, soft rock is softened and disintegrated by water, so a standard cylindrical undisturbed sample cannot be produced by a conventional water drilling method, the size of cylinder is hard to control by artificial cutting, the success rate of sample manufacturing is low, and the provided manufacturing method solves the problems mentioned above. Moreover, the manufacturing method has the advantages of low cost, resource saving, simple manufacturing process, practicality, and convenience.
Description
technical field [0001] The invention belongs to the field of rock mechanics tests, and in particular relates to a method for making an undisturbed sample of soft rock. Background technique [0002] Indoor rock mechanics test is an important means to obtain rock mechanics parameters, especially the triaxial test needs to make a standard cylindrical undisturbed sample of a specific size according to the specification requirements. The production of rock samples is a crucial step. For traditional cylindrical samples, drill cores are usually used. During the drilling process, the high temperature generated by the heat of the drill head will not only affect the mechanical properties of the rock but also damage the drill bit itself. To solve this problem, it is often Using rhinestones, through the water to achieve the purpose of cooling. [0003] However, soft rock is a kind of engineering material with special properties. When it is disturbed in a dry state, it is extremely easy...
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IPC IPC(8): G01N1/28
CPCG01N1/286
Inventor 姚华彦刘鹤张振华陈清
Owner HEFEI UNIV OF TECH