Ultra-deep excavation centrifuge model test simulation apparatus and testing method thereof

Abstract

The invention relates to an ultra-deep excavation centrifuge model test simulation apparatus and a testing method thereof. The apparatus is composed of an excavation driving part and an excavation model part, and the structure of the excavation driving part is characterized in that a supporting plate is fixed to the top of a model box, and an elevating motor driven through a speed reducer by a large power single-phase motor and a linear bearing are fixed to the supporting plate; the structure of the excavation model part is characterized in that a guide rod traverses through the linear bearing and can freely vertically move in the linear bearing; the upper end of the guide rod is provided with a lifting beam; a load sensor is fixed to the lower surface of the lifting beam; and a lifting model is fixed to the lower end of the guide rod. The apparatus can normally run under the high gravitational field of a centrifuge, has the advantages of simulation of large excavation depth and excavation amount, excavation mode control and transformation convenience, benefiting for the arrangement of a geotechnical centrifuge model, very safe operation and precise control, and can simulate various types of excavation engineering (or filling engineering).

Description

technical field [0001] The invention relates to an auxiliary device applied to a geotechnical centrifuge, in particular to a device that can be used to simulate the centrifugal model test of ultra-deep excavation conditions, and is especially suitable for carrying out deep excavation such as ultra-deep excavation channels, deep foundation pits, etc. Larger engineering test simulations to study the mechanism of soil rebound deformation due to unloading caused by deep excavation. By controlling the reverse loading of the driving device, this equipment can also be applied to the centrifugal model test simulation of super high filling engineering to study the mechanism of soil compression deformation caused by the load caused by high filling. Background technique [0002] With the rapid development of China's social economy, geotechnical engineering has encountered more and more technical problems. Among them, there have been more and more ultra-deep excavation projects in recen...

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Problems solved by technology

[0012] The purpose of the present invention is to provide a kind of ultra-deep excavation centrifugal model test simulation equipment, aiming at solving the following key problems under the high gravity acceleration field of the centrifuge: 1. The excavation depth that can be simulated by the prior art is small and the excavation volume is relatively small. Small size, inconvenient control of excavation type; 2, the existing technology is not conducive to the layout of the geotechnical centrifugal model; 3, the existing technology is not safe; 4, the existing technology is difficult to achieve precise control

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