Combined ultrathin flexible uniformly distributed pressure loading device for geomechanical model tests

Abstract

The invention relates to a combined ultrathin flexible uniformly distributed pressure loading device for geomechanical model tests. The device comprises an ultrathin hydraulic oil cylinder thruster and a combined flexible force transfer cushion layer, wherein the center of the hydraulic oil cylinder thruster is provided with a loading oil cylinder; the top of an oil cylinder piston is provided with a connecting flange; and the bottom of the hydraulic oil cylinder thruster is provided with the combined flexible force transfer cushion layer. The device can be widely applied to the surface loading of various geomechanical model tests, has a simple structure and is flexibly assembled and convenient to operate, a single loading unit has a reasonable size, a hydraulic oil cylinder is a two-way oil cylinder with an oil inlet and an oil outlet, and a hydraulic station and a hydraulic automatic control system are matched to realize loading and unloading; meanwhile, a plurality of loading devices can be combined in different arrangement modes, so that gradient loading is realized. The hydraulic oil cylinder, the rigid thruster and the flexible force transfer rubber cushion layer are integrated, so that the loading space is greatly reduced, the size of a model counter force frame is reduced, and the steel of the counter force frame is saved.

Description

[0001] technical field [0002] The invention relates to a loading device, in particular to a composite ultra-thin flexible uniform pressure loading device suitable for geomechanical model tests. Background technique [0003] The geomechanics model test is beneficial to highlight the main contradiction in the complex test process, and it is easy to grasp and discover the inner relationship of the phenomenon. Abroad, experts headed by Furman Green created the engineering geomechanics model test technology in the Italian Structural Model Test Institute. Subsequently, countries such as the United States, Germany, France, the United Kingdom, and Japan also carried out a large number of model test studies. In China, Tsinghua University, the Third Research Institute of the General Staff Engineering Corps, Shandong University and many other scientific research institutes have successively carried out geomechanical model test research on many large-scale engineering projects in Chi...

AI Technical Summary

Problems solved by technology

[0010] 1. Most of the loading system is actually a rigid loading system of hydraulic cylinder + thruster, the load deviation is large, it is easy to cause stress concentration, and the purpose of uniform load distribution on the model surface cannot be achieved

[0011] 2. Due to the disadvantages of small stroke, easy oil leakage, poor durability, only one-way loading, and difficult perforation and wiring on the hydraulic bladder loading, it cannot meet the needs of large-scale model tests.

[0012] 3. The structure of the piston-type uniform pressure loader is complex, the price is high, and it is not conducive to the extraction of the buried measuring line in the model

[0013] 4. The loading method of most oil cylinders is in the form of oil cylinder + thruster, which needs to reserve a large loading space, and has poor adaptability to the situation of limited loading space

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