Method for positioning and forming hidden and buried grotto in geomechanical model test

Abstract

The invention relates to a method for positioning and forming a hidden and buried grotto in a geomechanical model test. The method comprises the following steps of: 1) manufacturing a wooden mould which has the same shape as the grotto, fixing a positioning steel rod in the middle at the top of the wooden mould of the grotto, connecting the positioning steel rod with a steel cross beam on a model frame through a positioning bolt, and moving the positioning steel rod up and down by translating the steel cross beam and rotating the positioning bolt to position the hidden and buried grotto precisely; 2) according to the spatial shape of the wooden mould of the grotto, manufacturing a high-strength pressing plate with steel lantern rings which are concentric and have different diameters, and compacting a model material layer by layer by using the high-strength pressing plate; and 3) moving the positioning steel rod up by rotating the positioning bolt, and pulling out the wooden mould to form a modeled hidden and buried grotto. By adopting the method, the modeled hidden and buried grottoes with different shapes and different diameters can be manufactured; the spatial precise positioning of the hidden and buried grotto can be realized; the interference of the model material on the periphery of the grotto in the grotto forming process is reduced; and standard shape, smooth inner wall and uniform and compact peripheral material of the grotto are effectively ensured.

Description

technical field [0001] The invention relates to a method for positioning and forming a buried cavern in a geomechanical model test, and mainly relates to a method for positioning and forming a buried cavern in deep underground engineering geomechanical model tests in the fields of energy, resources and national defense engineering. Background technique [0002] In recent years, my country's economic development has become more and more rapid, and the requirements for infrastructure construction have continued to increase. With the continuous development of the national economy, a large number of large-scale underground projects in the fields of hydropower, transportation, energy, and national defense have started construction one after another. Due to its concealment and complexity, underground engineering requires theoretical research on the one hand and model tests on the other. Under the condition of basically satisfying the principle of similarity, the geomechanical mod...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the inner wall of the cavity is easy to form joints, and the physical and mechanical parameters between the prefabricated blocks are discontinuous, which greatly affects the test results.

With this method, the excavation of concealed caverns needs to be positioned on the basis of the excavated caverns of the previous level, and the excavation of caverns with variable cross-sections cannot be carried out.

[0007] (4) The invention patent with application number 201110067678.8 proposes a cavity-forming device for buried caverns in underground engineering test models, but the patent does not introduce the positioning and forming methods of buried caverns in models

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