Model experiment method and device of gallery test under simulation deep condition

Abstract

The invention provides a model experiment method and device of gallery test under a simulation deep condition, and relates to the field of underground engineering. The model experiment method comprises the steps of selecting a model sample material conforming to a similar theory, placing the mixed material in a die, burying a pressure sensor and a resistance sensor at corresponding positions in the material, performing formation and compaction to form an experiment piece, placing the experiment piece in a model rack, converting centralized load to a uniformly-distributed load through a force transmission plate by a jack so as to apply onto the model, digging the experiment piece by a simulation digging device, and recording corresponding gallery stress condition and displacement and dynamic characteristic change of a key part rock during the simulation digging process and after completion of the digging. The model experiment method and device of the gallery test under the simulation deep condition can be used for researching mechanical behavior, deformation and damage mechanism under the gallery deep stress condition, and the change of each aspect of the gallery under the deep stress state can be more truly, accurately, intuitively and comprehensively reflected.

Description

technical field [0001] The invention relates to the technical field of underground engineering, in particular to a model test method and a device thereof for simulating tunnel tests under deep conditions. Background technique [0002] The rapid development of the world economy has gradually depleted the mineral resources in the shallow part of the earth, and the development of resources has continued to move to the deep part of the earth. At the same time, the needs of human survival and development and the exploration of the unknown world have continuously expanded the underground space for activities. On the Earth scale, the continental crust has an average thickness of 30-40 km, the mantle has a thickness of 2700 km, and the lithosphere composed of the crust and the top of the mantle has an average thickness of about 200 km. In terms of resource mining, the depth of coal mining has reached 1500m, the depth of geothermal mining has exceeded 3000m, the depth of non-ferrous ...

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Problems solved by technology

[0006] Model tests play a very important role in the development of related rock theory research and engineering research and development. At present, many researchers have researched and developed some roadway model test devices, which can reflect the characteristics of the roadway model in some cases. These devices still have The following deficiencies: (1) The existing roadway model test device is only designed according to a specific scientific research project or construction project, which has certain limitations and cannot be applied to roadway model tests under other conditions

(2) The loading accuracy of the existing roadway model test device is poor. As mentioned in the background information, the actual stress of deep underground engineering should be in a state of complete hydrostatic pressure, and the existing underground engineering model test system cannot accurately simulate the actual stress state

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