Complete plane strain similar test system capable of applying gradient strain

Abstract

The invention relates to a complete plane strain similar test system capable of applying gradient strain. The whole system comprises a plurality of combined modules, a detachable combined module, a horizontal gradient strain servo control system, a vertical strain servo control system, a connecting lifting control system and a data acquisition control system. Due to the adoption of the system, a more practical test condition is provided for an urban underground construction and a mining engineering; the test system can slide freely along with a rock via the modules of two sides and limits the movement in the direction vertical to a model, so as to realize the plane strain similar test. The upper pressure under a deep geological condition can be compensated by the vertical strain servo control system, and the horizontal gradient strain is applied by the horizontal gradient strain servo control system. The test condition of the test system can be well consistent with the actual engineering condition, the results of the test are more real and more reliable, and can guide the design and construction scientifically and reasonably, and therefore a scientific test condition is provided for the stability research of geotechnical engineering.

Description

technical field [0001] The invention relates to coal mines, (non-)metal mines, urban subway projects, railway and expressway tunnel projects, slope projects, especially deep mining coal mines and other mines. According to the International Classification of Inventions (IPC), it belongs to the Department of Buildings, the Mining Division of Soil or Rock Strata, the test system for geotechnical engineering mining such as mines, tunnels and slopes, the stability of confining pressure of slopes and tunnels, and the safety of urban subway construction. It is a technical field of research on the stability of mining roadways in deep mines, and the law of mining roof collapse and disasters. Background technique [0002] For the safe and efficient mining of mines and the research on the roof collapse law and disaster mechanism of ore body mining, in order to ensure the safety of important infrastructure and municipal engineering, and to provide scientific design and construction basi...

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Problems solved by technology

[0004] However, all similar test devices at present are not complete plane strain test devices, because the strain in the vertical cross-sectional direction is not limited, and they are essentially plane stress test devices, and some baffles are used to limit the strain in the vertical cross-sectional direction. There is a large friction between the plate and the model, which constrains the strain of the model in the cross-sectional plane, and does not meet the plane strain deformation condition

Moreover, the current similar tests are carried out without considering the horizontal gradient stress, which is inconsistent with the stress state of the actual project, and the influence of the horizontal stress is very significant with the increase of the depth of the underground project, which can no longer be ignored

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