Experimental platform for the interaction between tunnel granular soil and support structure

Abstract

The invention belongs to the field of mechanics study of grained soil and in particular relates to an experimental platform for an interaction between tunnel grained soil and a supporting structure. An experimental bin is a rectangular box, wherein the box comprises a front side face, a rear side face, two end side faces and a bottom surface; the upper top surface is open; fixing plates are arranged at the bottoms of the front side face and the bottom side face; movable doors are respectively arranged on the fixing plates; baffles are respectively mounted at the movable doors; anchor bolt holes are distributed in the baffles; multiple holes are formed below the anchor bolt holes; the holes are used for allowing cuboid-shaped plates to insert; strain gages are distributed on the cuboid-shaped plates; and the anchor bolt holes are used for allowing an anchor bolt of an anchor bolt simulator to insert. According to the platform, an area needing to be measured is divided into many rectangular small areas by utilizing the principle that the stress of the plates is related to deformation thereof, the deformation amount of each small plate is measured, and the pressure in the area is approximately obtained by utilizing calculation or numerical simulation. The sizes of the areas can be changed, and the smaller the divided areas are, the more accurate the result is.

Description

technical field [0001] The invention belongs to the field of granular soil mechanics research, and in particular relates to an interaction experiment platform for tunnel granular soil and supporting structures. Background technique [0002] Particulate matter is a kind of material form that exists in nature and daily life and is often seen, such as sand, stones, soil, snow particles, etc. in nature, sugar, salt, grain, etc., and industrial Commonly seen in production are medicines, ores, etc. In mechanics, granular matter is defined as a material system composed of a large number of particles connected in various complex ways, and the diameter of the particles in this system is greater than 1 μm. [0003] In recent years, with the rapid development of my country's national economy, more and more attention has been paid to the development and utilization of urban underground space. More and more cities have planned and built a large number of underground engineering faciliti...

AI Technical Summary

Problems solved by technology

[0005] In the field of scientific research, the mesoscopic mechanical properties and migration laws of the stability of the granular soil surrounding rock are still uncertain; the mesoscopic failure mechanism of the granular surrounding rock of the tunnel under the partial excavation method of the granular surrounding rock is less studied; The nature of the surrounding rock The evolution mechanism of the surrounding rock collapse pressure arch is not clear; the location and timing of the surrounding rock failure cannot be accurately judged, etc.

At present, the calculation of the load of granular surrounding rock is mainly based on the theory of loose body pressure, but when the theory is derived, many assumptions are artificially stipulated, resulting in a large difference between the calculated result and the actual load of the surrounding rock.

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