Flexibility uniform distribution pressure loading device applicable to geomechanical model test

Abstract

The invention relates to a flexibility uniform distribution pressure loading device applicable to a geomechanical model test, comprising a hydraulic cylinder thrustor, wherein the upper end of the hydraulic cylinder thrustor is connected with a hydraulic cylinder by virtue of a spherical hinge, and the bottom of the hydraulic cylinder thrustor is provided with a flexible force-transfer cushion layer. The loading device can be connected with a counter-force frame by virtue of a preposition flange or a postposition flange of a hydraulic cylinder, the maximum load of 50t can be applied, the maximum load intensity on the model surface is 4.5MPa, the load intensity deviation is less than or equal to 5%, the stress on the model surface is uneven, and the depth is less than 100mm. The invention can realize flexible uniform distribution pressure loading on the model surface; the structure is simple, the assembling is flexible, the operation is easy, the size of single loading unit is reasonable, and the loading and unloading can be realized when the hydraulic cylinder is combined with a hydraulic station and a hydraulic automatic control system; and meanwhile multiple loading devices can be combined in different arrangements, and the gradient loading is realized. The invention integrates the hydraulic cylinder, the spherical hinge, the thrustor and the flexible force-transfer cushion layer, and the uniform distribution loading effect is better.

Description

[0001] technical field [0002] The invention relates to a loading device, in particular to a 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 China. [0004] The mod...

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

Images