A Method for Measuring the Tensile Mechanical Properties of Rock Rapidly

Abstract

The method for quickly measuring the tensile mechanical properties of rocks comprises the following steps: (1), making a rock sample; (2), using superglue to bond the two ends of the rock sample to the clamping sleeve in the clamping assembly respectively, and The superglue between the two ends of the rock sample and the clamping sleeve is rapidly cooled and solidified through the rapid condensation device; (3), after the two ends of the rock sample and the clamping sleeve are firmly bonded, it is taken out from the rapid condensation device , assemble the clamping sleeves at both ends of the rock sample with the remaining parts in the clamping assembly, then fix the clamping assemblies at both ends of the rock sample on the tensile testing machine, and start measuring the tensile mechanical properties of the rock sample; (4 ), after the stretching is over, remove the rock sample and the clamping assembly, and quickly disassemble the rock sample and the clamping assembly; (5), repeat the above steps (1)-(4), and continue to measure several rocks Tensile mechanical properties of the sample; (6), the end of the test. The invention is convenient and fast in disassembly and assembly, and improves 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...

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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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