Soft rock tunnel buffer layer model test device and test method

By designing a soft rock tunnel buffer layer model test device, the deformation of the buffer layer material in the tunnel is simulated, its mechanical properties and pressure-relieving mechanism are detected, and the problem of unclear performance of buffer energy-absorbing materials in the prior art is solved, and effective detection of buffer layer material and improvement of construction technology are achieved.

CN119715124APending Publication Date: 2025-03-28SHAOXING UNIVERSITY
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Patent Information

Application Number
CN202411862557.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-17
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The mechanical properties of existing buffer energy-absorbing materials in tunnels and their compressive mechanisms are unclear, which leads to the inability to unify the support parameter design and construction technology, which limits the application of buffer pressure-back technology in tunnels and underground engineering.

Method used

A soft rock tunnel buffer layer model test device is designed. By simulating the real deformation of the buffer layer material in the tunnel, it can detect the mechanical and pressure performance of buffer layer materials of different thicknesses under the working conditions where the radial pressure, circumferential pressure and the simultaneous existence of both.

Benefits of technology

The basic mechanical properties and compression mechanism of the buffer layer material are detected, the protective effect of the buffer layer material on secondary lining is verified, the preparation cycle of the new buffer layer material is shortened, and the uniformity and economicality of the construction process are improved.

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Abstract

The invention discloses a soft rock tunnel buffer layer model test device and test method, and belongs to the technical field of geotechnical engineering.The soft rock tunnel buffer layer model test device comprises an outer box, and the outer box comprises a bottom plate, a top plate and four side plates which are fixedly connected; a first round steel sheet is arranged between the top plate and the bottom plate and is a cylindrical hollow steel sheet, the top end of the first round steel sheet is welded with the edge of the round hole of the top plate, and the bottom end is welded with the bottom plate; a simulation surrounding rock is arranged in the outer box; a second round steel sheet, a third round steel sheet and a fourth round steel sheet are arranged on the inner side of the first round steel sheet; a primary support is cast between the first round steel sheet and the second round steel sheet, and a secondary lining is cast between the third round steel sheet and the fourth round steel sheet; and a buffer layer is arranged between the primary support and the secondary lining. Real deformation of different buffer layer materials in a tunnel is simulated through the tunnel detection model, and the performance of the buffer layer materials can be detected under three different working conditions of radial yielding, annular yielding and simultaneous existence of the radial direction and the annular direction.
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