Stress loading device

Abstract

The invention relates to a stress loading device. The stress loading device comprises a loading cabin, a hydraulic control system and a servo oil source; the loading cabin comprises an axial horizontal rear loading cover, an annular loading frame and a front counter-force cover; a test piece platform for horizontally bearing a model is arranged on the bottom side in the annular loading cabin frame; uniformly distributed loader arrays which are used for applying stress are arranged on the left side, the right side and the upper side, opposite to the left surface, the right surface and the upper surface of the model, in the annular loading frame; uniformly distributed loader arrays are arranged in the axial direction, opposite to the rear surface of the model, of the rear loading cover; a front counter-force plate is arranged in the axial direction, opposite to the front surface of the model, of the front counter-force cover. The uniformly distributed loaders in the loading cabin are connected with the servo oil source; a displacement sensor and an oil pressure sensor are arranged in the loading cabin; the displacement sensor and the oil pressure sensor are connected with a hydraulic control system. The annular loading frame is detachably connected with the rear loading cover and the front counter-force cover in a sealed manner. The device can apply a variety of modes of stress to the models with different sizes.

Description

technical field [0001] The invention relates to geomechanics model test loading equipment, in particular to a stress loading device for coal and rock engineering simulation experiments. Background technique [0002] The model loading system is a key technology in the geomechanics model test, because it is directly related to the simulation effect and accuracy, and also directly affects the similarity of the stress (strain) field formed in the model block. It plays a vital role in whether the model test results can conform to the actual stress state of the project. [0003] In the existing model loading technology, the following two loading methods are commonly used: one is to use a true triaxial loading system to load the model, such as the high ground stress true three-dimensional loading model test system disclosed in CN101285808B; the other is to use a flexible rubber bag to load the model. Model loading, such as the disclosed high ground stress flexible loading instant ...

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Problems solved by technology

The disadvantages of the above two loading methods are also gradually exposed: (1) the force in each direction of triaxial loading can only be a whole, and the uneven force state of the model in the same direction cannot be faithfully simulated; (2) loading with flexible rubber , the loading uniformity is acceptable, but its stroke is small and the load intensity is low, which cannot meet the large deformation and high strength requirements of the model, and the scope of application is greatly limited; it cannot be recycled and practical, the cost is high, and the loading The size of the model is generally small (all less than 1 cubic meter), and the simulation can be realized in the case of relatively simple geological environmental conditions, but it cannot fully simulate the situation of more complex geological conditions

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