Centrifugal test model for verifying combined action of supporting structure and soil body and manufacturing method of centrifugal test model

Abstract

The invention discloses a centrifugal test model for verifying combined action of a supporting structure and a soil body and a manufacturing method of the centrifugal test model and belongs to the field of geotechnical engineering test. The centrifugal test model structurally comprises a model box; a supporting plate for simulating a supporting wall is vertically embedded into the model box; a bending moment strain gauge is arranged on the supporting plate to detect the bending moment strain value of the supporting plate; the supporting plate divides the inside of the model box into a foundation soil layer zone and an excavation zone, the foundation soil layer zone is filled with foundation soil, the lower part of the excavation zone is the foundation soil, and an excavating bucket soil bag for simulating the earthwork of an excavating bucket is arranged at the upper part of the excavation zone; a soil pressure sensor is arranged in the foundation soil to detect the pressure value of the foundation soil; displacement meters are respectively arranged on the surface of the foundation soil and the supporting plate. The centrifugal test model disclosed by the invention is suitable for a centrifugal model test for verifying the scientificity of combined action of the supporting structure and the soil body, simple and definite in principle, low in manufacturing cost and consistent with actual construction conditions and conforms to the actual stress change of the soil body.

Description

technical field [0001] The invention relates to the field of geotechnical engineering tests, in particular to a centrifugal test model and a manufacturing method for verifying the joint action of a support structure and soil. Background technique [0002] Traditional geotechnical engineering laboratory tests are carried out under constant gravity conditions. Since it is impossible or difficult to reproduce the actual size conditions on site, it is often a scaled model. According to the self-weight stress of the soil, the scaled model brings the soil depth h The shrinkage, and then change the stress field of the soil self-weight, for the structure with self-weight as the main load, it cannot reflect the stress state of the prototype, so that the model test cannot simulate the phenomenon that occurs in the prototype. [0003] The geotechnical centrifugal model test can truly simulate the existence of the gravity field and reproduce the actual stress state of the project. It is...

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Problems solved by technology

[0004] To sum up, with the large scale and complexity of underground engineering, the previous practice of relying on engineering experience will not meet the design and construction requirements. The centrifugal model test of foundation pit engineering can effectively study the problems of foundation pit engineering and promote the improvement of foundation pit engineering. Perfection of theory and numerical simulations

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