Water-oil isolation type soaking three-axis testing tank and testing method

Abstract

The invention provides a water-oil isolation type soaking three-axis testing tank and a testing method, relates to the technical field of testing equipment and aims to solve the technical problem thatvariable confining pressure testing is hard to implement under a long-term soaking condition of a test part. The testing tank comprises a soaking pressure cabin, a hydraulic oil cabin, a heater, a pressure sensor, a temperature sensor, a transfusion channel, a refrigeration device, an oil pressure control device and a transfusion adjusting device, wherein the soaking pressure cabin is arranged inside the hydraulic oil cabin; a flexible film is arranged between the soaking pressure cabin and the hydraulic oil cabin; the transfusion channel is communicated with the soaking pressure cabin and the transfusion adjusting device. By adopting the device, operation such as confining pressure loading and confining pressure release is directly implemented on a test part in the soaking pressure cabin, and deformation situations of rock explored at different water full states of a mining well can be simulated. The testing tank structure provided by the invention has the advantages of being simplein structure, convenient to operate, and the like, and the testing method with the testing tank has the advantages of being small in experiment error, wide in simulation range, and the like.

Description

technical field [0001] The invention relates to the technical field of rock mechanics test equipment, in particular to a water-oil isolation type submerged triaxial test box and a method for performing triaxial tests using the device. Background technique [0002] In recent years, with the continuous development of my country's economy, my country's mining projects, tunnel projects, subway projects and other underground projects have developed rapidly. However, some projects will encounter soft rocks during construction. Soft rocks are easy to soften when exposed to water, resulting in a decrease in rock strength, which causes great difficulties in construction and has a serious impact on the safety of workers. Therefore, analyzing the mechanical properties of rocks immersed in water for a long time through rock mechanics experiments plays an important role in practical construction. [0003] In the existing mechanical experimental research on rock specimens under the actio...

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Problems solved by technology

[0003] In the existing mechanical experimental research on rock specimens under the action of water, most of them use methods such as controlling different immersion times and measuring the moisture content of the specimens. Take out the test piece for the experiment, and the loading process generally takes several hours. In this case, the water in the rock test piece is easy to evaporate, resulting in large errors in the experimental results.

Chinese patent CN201810004350 proposes a rock and soil shear creep meter considering dry-wet cycle, through which the dry-wet cycle simulation of specimen saturation and dehumidification can be carried out, but the long-term water immersion and confining pressure change are not considered situation, it is impossible to do mechanical experimental research on this kind of working condition

Chinese patent CN2017214773 proposes a humidity control device for uniaxial compression tests, through which the humidity of the test piece can be controlled to test the mechanical properties of the test piece under different dry and wet conditions, but this patent does not consider the long-term water immersion and different The working condition of confining pressure makes it impossible to carry out the mechanical experiment research under the corresponding working condition

In addition, existing triaxial experimental devices such as Chinese patents CN201110198841, CN201720459789, CN201730487413, CN201721715979, CN201721697658, etc., control the confining pressure of the sealed test piece by changing the volume of hydraulic oil around the sealed test piece, and separate the test piece from the hydraulic pressure by using some sealing measures. Oil, although this setting can change the confining pressure of the test piece, it is found through actual operation that the hydraulic oil will still be in contact with the test piece in the experiment, and the infiltrated hydraulic oil will change the mechanical properties of the test piece to a certain extent, causing an impact on the test piece Thereby changing the experimental results, so it is necessary to further improve the existing test equipment

[0004] In addition, the existing triaxial loading test method does not consider the actual working conditions of long-term water-soaked ore pillars and rock masses, and cannot simulate the mechanical experimental research under similar working conditions, especially for different liquid heights, different material test pieces, and different confining pressures. , Different loading forms of water-oil isolation and different confining pressure water immersion triaxial test method

The existing triaxial mechanical experiment method is to control the confining pressure of the sealed test piece by changing the volume of hydraulic oil around the test piece. Although this experimental method can change the confining pressure of the test piece, it is found through actual operation that the hydraulic oil in the experiment will still change. In contact with the specimen, the infiltrated hydraulic oil will change the mechanical properties of the specimen to a certain extent. The existing loading method changes and loads the confining pressure of the rock specimen immersed in water during the experimental loading process. In order to make the experimental results and the actual The engineering situation is closer, and then through the analysis of the experimental results, it can provide a more scientific and reasonable construction reference for the construction of similar working conditions, so it is necessary to further improve the existing experimental methods

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