Weakly-cemented rock mass water absorption test device and test method

Abstract

The invention discloses a weakly-cemented rock mass water absorption test device and test method. The device comprises a test specimen tube, a test specimen tube support, a lifting screw rod, a weighing sensor, a weighing sensor recorder, a water supply tank, a constant-temperature water tank, leveling supports, a temperature controller, heating modules, temperature sensors, a water level controlvalve and the like. The water temperature and water level can be accurately controlled by the temperature controller and the water level control valve, and influences of water temperature and water level variation on test specimen mineral water absorption activity and water absorption mass monitoring results in a testing process can be eliminated while water absorption tests of weakly-cemented rock mass test specimens under different temperature conditions can be carried out. By the high-accuracy weighing sensor, test specimen water absorption mass variation can be continuously monitored to obtain a test specimen water absorption mass variation law under different temperature conditions. By a CCD (charge coupled device) camera module, an evolution law of macro-micro crack (fracture) structures on surfaces of test specimens can be recorded in real time. The test device and the test method have advantages that scientificity, feasibility and convenience in operation are achieved, and testefficiency and test result accuracy can be remarkably improved.

Description

technical field [0001] The invention relates to a water absorption test device and test method for argillaceous weakly cemented rock mass, in particular to a water absorption, water diffusion and test method for samples of weakly cemented rock mass with high clay mineral content under different temperature conditions. A test device and a test method for real-time monitoring of the evolution process of the micro-crack (crack) structure on the surface. Background technique [0002] The argillaceous weakly cemented rock mass is a porous medium material, including a large amount of hydrophilic clay minerals such as montmorillonite, illite, and kaolinite. Transport occurs in vivo. After the rock mass with high clay minerals interacts with water, the cementation property decreases, the strength parameters weaken, and it is very easy to lose stability under the action of engineering stress. Water-rock interaction is one of the most basic research topics on the structural stabilit...

AI Technical Summary

Problems solved by technology

[0005]In a word, if the sample is taken out from the sample cylinder, then the water absorption, water level line and the macro-microscopic crack (crack) structure test of the sample surface are respectively carried out analysis, there will be many problems in this way; firstly, after the sample absorbs water, the strength of the water-absorbing end of the sample is low, especially the weakly cemented rock mass (lower strength, easy to muddy and disintegrate), which is easy to fracture and damage in the process of taking it out, almost The water absorption test of the sample under different immersion time conditions cannot be carried out multiple times; secondly, due to the environmental differences such as temperature, pressure difference, and water level fluctuations inside and outside the sample cylinder, the sample loses water and absorbs water alternately, which will lead to rock mass Structural changes, resulting in large measurement errors

In addition, repeated operations have a disturbing effect on the structure of the sample, which affects the structural and mechanical properties of the sample to a large extent, causing errors in test results.

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