Method for quickly measuring tensile mechanical properties of rocks

Abstract

The invention provides a method for quickly measuring tensile mechanical properties of rocks. The method comprises the following steps: step (1), manufacturing a rock sample; step (2), enabling the two ends of the rock sample to be bonded with clamping sleeves in clamping assemblies respectively by using super glue, and rapidly cooling and curing the super glue between the two ends of the rock sample and the clamping sleeves through a rapid condensing device; step (3), after the two ends of the rock sample are firmly bonded with the clamping sleeves, taking out the rock sample from the rapid condensing device, and assembling the clamping sleeves at the two ends of the rock sample and the rest components in the clamping assembly, fixedly installing the clamping assemblies at the two ends ofthe rock sample on a tensile testing machine, and starting to measure the tensile mechanical property of the rock sample; step (4), after stretching is finished, taking down the rock sample and the clamping assemblies, and rapidly splitting the rock sample and the clamping assemblies; step (5), repeating the above steps (1) to (4), and continuing to measure the tensile mechanical properties of several rock samples; and step (6), ending the test. The method for quickly measuring the tensile mechanical properties of the rocks provided by the invention is convenient and rapid to assemble and disassemble and capable of improving the test efficiency.

Description

technical field [0001] The invention relates to the technical field of rock tensile tests, in particular to a method for quickly measuring the tensile mechanical properties of rocks. Background technique [0002] Rock is a heterogeneous material with defects such as microcracks and pores inside, which makes the tensile strength of rock much lower than its compressive strength, so rock cannot bear large tensile stress. Tensile failure is one of the main failure forms of engineering rock mass and natural rock mass. The failure of engineering rock mass often starts from the local tensile failure of the rock. The surrounding rock mass of underground engineering is mostly in a three-dimensional stress state. After unloading, the surrounding rock body may have a stress state of two directions of compression and one direction of tension in a certain direction, so it is necessary to study the strength characteristics of rocks under tension stress. [0003] Chinese patent CN20582642...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN205826421U discloses a device for measuring direct tensile mechanical parameters of rocks, which can perform direct tensile tests on rock samples, effectively avoid eccentric loading of rock samples when they are pulled, easy to operate, easy to disassemble and assemble rock samples, It can directly measure the deformation of the rock sample under load through the strain gauge, and the measurement is accurate; however, this device still has some defects: the upper connecting seat and the lower connecting seat are connected by connecting bolts, and the installation and disassembly are time-consuming and laborious. If the connecting column is threadedly connected with the threaded hole on the lower connecting seat, the lower connecting seat needs to be rotated and tightened on the connecting column during assembly. The operation is complicated, and assembly errors are likely to occur after the thread is worn. The bottom surfaces of the two grooves are bonded with superglue. The bonding surface of this bonding structure is small, the strength is low, and debonding is easy to occur, so the test effect is not good. Moreover, after a rock tensile test is completed, the rock sample Due to the effect of superglue, it is not easy to separate between the two ends of the rocker and the bottom of the two grooves, which seriously affects the efficiency of the rock tensile test; and when the rock sample is bonded, the curing time of the superglue is relatively long

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