A Method for Repairing Defective Rock Samples in Rock Tests

Abstract

The invention relates to a method for repairing a defect rock sample in rock test. The method comprises the steps of selecting an incomplete rock sample and an undersized rock sample which cannot be subjected to the cutting test and cleavage test, and clearing the dust of the rock sample; preparing K39 crystal resin at the temperature of 35 to 45 DEG C (in warm water bath) according to the following weight percent: 0.2 to 0.8 percent of defoaming agent, 0.3 to 0.5 percent of promoter and 0.6 to 1 percent of hardening agent, sequentially adding the promoter, the hardening agent and the defoaming agent after measuring resin according to the requirement at the interval of 20s, and uniformly stirring the resin; pouring the stirred resin into a clean mold which is coated with lubricating oil until the surface of the mold is covered by the resin, arranging the defect rock sample in the step 1 into the mold, finally adding the resin to a preset size, and waiting for the solidification of the resin; removing the mold 1 to 2 hours later after the solidification of the resin, and polishing the outer surface of the demolded rock sample. By adopting the method, mass acquisition and drilling of the rock sample can be reduced, and the utilization rate of the incomplete and irregular rock sample in the drilling and construction process can be increased.

Description

technical field [0001] The invention discloses a defect rock sample repairing method in rock test, which is used for reforming the defect problem of sample selection before rock splitting and shearing test. Background technique [0002] The strength parameter of rock is one of the important parameters in rock engineering design. Tensile failure is one of the basic forms of rock failure, and tensile strength is an important index of rock mechanical properties, which is of great significance to underground engineering design, analysis and calculation. Due to the complex processing of rock specimens by the direct tension method, the test operation is difficult. Therefore, the indirect tensile test-split method is widely used to measure the tensile strength of rock. At present, the most commonly used rock strength theory or rock failure criterion in engineering is still Coulomb's (Coulomb) criterion, Mohr's (Mohr) criterion and Griffith's criterion. One of the most commonly us...

AI Technical Summary

Problems solved by technology

[0004] Previous studies mainly used mortar, gypsum, etc. for filling. During the implementation process, water was involved in infiltration, so that the mortar, etc. entered the interior of the rock mass with the infiltration of water, which would seriously affect the authenticity of the data.

Chinese Patent: "A Method for Making Rock Samples", (Application No.: 201110002099.5) discloses a technical scheme that uses rock sample fragments to make test blocks, but when carrying out shearing, splitting and point load tests, it cannot Ensure that the failure surface completely passes through the original rock blocks, resulting in data distortion