Composite flexible uniform pressure loading device suitable for geomechanical model test

Abstract

The invention relates to a composite flexible uniform pressure loading device suitable for a geomechanical model test. The device comprises a hydraulic oil cylinder thruster, wherein the upper end of the hydraulic oil cylinder thruster is connected with a hydraulic oil cylinder through a spherical hinge; and a composite flexible power transfer cushion layer is arranged at the bottom of the hydraulic oil cylinder thruster. The device can be widely applied to surface loading of various geomechanical model tests, has a simple structure, is flexible to assemble and convenient to operate and ensures rational size of a single loading unit; the hydraulic oil cylinder is a two-way oil cylinder with an oil inlet and an oil outlet; loading and unloading can be realized by matching a hydraulic station with a hydraulic automatic control system; meanwhile, a plurality of loading devices can be combined in different arrangement modes to realize gradient loading. In the device, the hydraulic oil cylinder, the spherical hinge, the thruster and the composite flexible power transfer cushion layer are organically combined, and the device has better uniform loading effect. An oil cylinder front loading flange can be fixed on a counterforce frame and a steel plate is penetrated by a piston rod to provide power, so the loading space is compressed, materials are saved and high adaptability is ensured.

Description

technical field [0001] The invention relates to a loading device, in particular to a composite flexible uniform pressure loading device suitable for geomechanical model tests. Background technique [0002] 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 China. [0003] The mo...

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Problems solved by technology

[0009] 1. Most of the loading system is actually a rigid loading system of hydraulic cylinder + thruster. The load deviation is large, which is easy to cause stress concentration and cannot achieve the purpose of uniform distribution of load on the surface of the model.

[0010] 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.

[0011] 3. The structure of the piston-type uniformly distributed pressure loader is complex, the price is high, and it is not conducive to the extraction of the buried measuring line in the model

[0012] 4. The loading method of most oil cylinders is 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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