Tunnel model test device for global observation of surrounding rock deformation and fracture

Abstract

The invention discloses a tunnel model test device for global observation of surrounding rock deformation and fracture. The tunnel model test device includes a model test box and a loading device for simulating pressure application to a soil layer; the model test box comprises a bottom wall, a peripheral side wall fixedly connected with the bottom wall in a detachable manner, and an observation assembly used for observing the interior of the model test box; the observation assembly is arranged on the side wall; the loading device includes a loading frame, a force applying mechanism and a force measuring mechanism; the model test box is located in the loading frame; and the force applying mechanism and the force measuring mechanism are arranged at the upper part of the loading frame. The tunnel model test device of the invention is simple and convenient to assemble. The size of the model test device can be adjusted according to different research objects. With the tunnel model test device adopted, change and influence in various aspects, of a tunnel surrounding rock support and protection system can be reflected more truly, comprehensively, intuitively and accurately, and therefore, the interaction mechanism of a tunnel surrounding rock support and protection structure can be better learned, and the mechanical properties of tunnel surrounding rock can be understood more deeply.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to a tunnel model test device for observing deformation and damage of surrounding rock in the whole field. Background technique [0002] In recent years, due to the rapid development of my country's economy and the country's vigorous investment in the field of transportation infrastructure, my country's road traffic has developed rapidly. my country is a country with many mountains and hills, especially in the hinterland of the west. Due to the special requirements of roads on lines and slopes, tunnels have become the best solution for roads and railways in China, and they account for a large proportion of my country's transportation construction. . Due to the complexity and randomness of the geological conditions of tunnel engineering, sometimes it is difficult to obtain satisfactory results only by calculation and analysis. Many related studies have shown that the research on th...

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Problems solved by technology

[0004] 1. The existing tunnel model test device is only designed according to a specific scientific research topic or construction project, which has certain limitations and cannot be used for tunnel indoor tests under other conditions;

[0005] 2. The existing tunnel model test devices only consider a similarity ratio of the model, and do not consider that the model can be adjusted in size to adapt to different similarity ratio tests;

[0006] 3. The existing tunnel model test device cannot directly observe and measure the surrounding rock changes in key parts of the tunnel and the scope of its influence. Changes of some local points in the surrounding rock;

[0007] 4. The loading system of the existing tunnel model test device has poor flexibility, and cannot study the mechanical behavior of the simulated tunnel at different depths of rock strata, nor can it study the mechanical behavior of the simulated tunnel at different partial conditions;

[0008] 5. The rigidity of the existing tunnel model test device is not enough, and it is easy to cause deformation of its overall structure during the process of continuous increase of force, resulting in the inconsistency between the model test and the actual situation, making the measured data not accurate enough, the precision is not high, often It is easy to cause waste of manpower and material resources

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