Self-balancing type true three-dimensional loading model testing bench frame with sliding wall

Abstract

The invention relates to a test bench of a true three-dimensional self-balancing loading model with a slide wall, the test bench has a loading system that is arranged outside a structural wall and comprises a door-typed reaction frame, the structural wall and the slide wall, the door-typed reaction frame can realize the loading of the upper, lower, left and right surfaces of a model body, only a hydraulic loading device is arranged in the outer side of the back structural wall in the forward and backward direction of the model body, and a plurality of reaction cross beams and a lateral pull rod can realize the symmetrically self-balancing loading in the forward and backward direction. The slide wall is arranged between the model body and the structural wall, and a plurality of bar observing windows are arranged surrounding the position of a perforated chamber on the structural wall. The test bench has the advantages that the test bench can realize three-dimensional graded loading, has convenient operations of excavation and shoring, and can remarkably reduce the surface friction force of the model body when loading, etc.

Description

technical field [0001] The invention relates to a geomechanics model test device, in particular to a self-balancing true three-dimensional loading model test bench device with a sliding wall. Background technique [0002] At present, the true three-dimensional loading systems that can be realized at home and abroad are mostly uniform loading systems without gradient changes, mainly because it is very difficult to implement step-by-step loading around the model body. In the geomechanics model test, there is a large friction force between the loading system and the contact surfaces of the model body, which will reduce the loading effect of the loading system and affect the overall deformation characteristics of the model body and the displacement and stress changes of internal measuring points. has a huge impact. How to achieve a reasonable true three-dimensional loading system and reduce the friction between the loading system and the contact surfaces of the model body has a...

AI Technical Summary

Problems solved by technology

[0008] (1) It is difficult to realize the model test research of underground caverns under the condition of large buried depth and high ground stress

[0009] (2) The depth of the model is large, and the cavern cannot realize manual layered excavation, grouting and anchoring, installation of convergence measuring points, pre-tightening of anchor cables, etc.

[0010] (3) The cracking phenomenon and development process of the surrounding rock cannot be observed during the test

[0011] (4) The frictional resistance between the loading system and the model body cannot be significantly reduced

This approach reduces the friction between the loading system and the model body to a certain extent, and has played a certain role in the test. However, the degree of reducing friction is not very large, and the friction coefficient is too high (up to 0.1). The problem of friction still exists and has become a major problem to be solved in model tests

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