A device for measuring free expansion rate and water content of rock and its application method

Abstract

The invention discloses a device for measuring the free swelling rate and the water content of a rock and a using method thereof. By adoption of the Archimedes principle as a reference, the device utilizes a basic principle that the volume of displaced water of the rock changes with the volume change of the rock in water after the rock swells by water absorption. The structure of the device for measuring the free swelling rate and the water content of the rock is largely simplified by adoption of technical means such as sealing and packaging of a rock sample to be measured with rubber film. The device has characteristics of simple structure, convenient raw material selection, low manufacturing cost, convenient operation, and the like. The whole experiment device is small in systemic error. Experiment results are true, reliable and accurate. The device is suitable for laboratory use, and particularly can be used for simultaneously perform measurement of the free swelling rate and the water content of soft rocks.

Description

technical field [0001] The invention relates to an experimental device for measuring the hydraulic properties of rocks and a method for using the same, in particular to a device for measuring the free expansion rate and water absorption rate of rocks used in a laboratory and a method for using the same. Background technique [0002] The hydraulic properties of rocks refer to the properties of rocks under the action of aqueous solution, including water absorption, hydraulic conductivity, softening, frost resistance, expansibility and solubility of rocks, which are important factors affecting the stability of rock engineering. General engineering rock mass always exists in a certain water environment. Affected by the change of water environment, the mechanical properties of engineering rock mass, such as strength, deformation and failure, will change, especially in soft rock conditions. Therefore, it is of great significance to accurately grasp the hydraulic characteristics of...

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Problems solved by technology

[0003] In the engineering rock test method standard (GBT 50266-1999), the free expansion rate and water absorption rate of rock samples are only suitable for rocks that are not easy to disintegrate when exposed to water, and the free expansion rate of hydrophilic soft rock cannot be measured

Another way to measure the free expansion rate is to weigh a certain amount of the crushed rock sample and pour it into a measuring cylinder, shake it flat, record the initial volume of the sample, then inject a sufficient amount of distilled water, and place it in a constant temperature box for regular observation. Record the volume change of the sample. The free expansion rate is the increment of the sample volume divided by the initial volume. Although this method can quickly measure the free expansion rate of the rock, it destroys the original structure of the rock and may have large errors.

[0004] Chinese patent application CN102830060A discloses a multi-functional rock expansion tester. Although it can be used for accurate measurement of rock expansion rate, due to its measurement principle and structural reasons, it inevitably has large size, complex structure and high cost. , cumbersome operation, etc.

[0005] On the other hand, the rock expansion tester in the prior art generally has the disadvantage of a single use function, and cannot meet the requirements for simultaneously measuring the expansion rate and water absorption rate of rocks.

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