Testing method for measuring tensile strength of rock by multiple times of splitting

Abstract

The invention discloses a testing method for measuring the tensile strength of rock by multiple times of splitting. The testing method comprises the following steps: firstly, preparing a to-be-measured rock sample; secondly, carrying out splitting test for the first time along the radial direction; thirdly, cementing the split rock sample; fourthly, replacing the non-cemented position, and carrying out the splitting test for the second time; fifthly, cementing the split rock sample; and sixthly, carrying out the splitting test further to the maximal allowable splitting times, thereby obtaining multiple tensile strength numerical values of the tested rock sample. According to the testing method for measuring the tensile strength of rock by multiple times of splitting, a plurality of rock tensile strength data can be obtained by carrying out on multiple times of splitting on the same rock sample, so that not only can the test cost be lowered greatly, but also the accuracy of the test result can be improved.

Description

technical field [0001] The invention relates to the field of measuring the tensile strength of rocks, in particular to a test method for measuring the tensile strength of rocks by splitting multiple times. Background technique [0002] In the design and construction of underground engineering, the tensile strength of rock is a very important mechanical index. The surrounding rock mass of underground engineering is often in a complex stress state, such as the surrounding rock mass of railway tunnels, highway tunnels, engineering slopes and underground engineering caverns, some places are in a state of tensile stress, while some parts are in a state of compressive stress , because the tensile strength of the rock is much lower than the compressive strength, the surrounding rock always begins to fail from the tensile stress area. Therefore, the correct regional division of the stress state of the underground surrounding rock, that is, the determination of the failure risk zone...

AI Technical Summary

Problems solved by technology

Since the final rock tensile strength value is obtained by substituting the test data into the theoretical formula, if the test conditions or operating process deviate greatly, and the force on the rock sample does not match the theory, its true tensile strength ca

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