System and method for laboratory testing of static and dynamic response characteristic of multifunctional reduced scale tunnel structure

Abstract

The invention discloses a system and method for laboratory testing of the static and dynamic response characteristic of a multifunctional reduced scale tunnel structure. The testing system comprises a static and dynamic loading subsystem, an observing and recording subsystem, a flange component and a flexible boundary component. Different forms of mechanical boundary conditions can be applied according to tunnel burial depth, bias state, surrounding rock grade and water bearing condition. The testing system is connected with a static loading system and a vibration table through the static and dynamic loading subsystem, static load and earthquake load can be applied conveniently, and parameter adjustment can be conducted according to actual conditions so as to simulate different load conditions. The testing device solves the problem of existing testing devices that the stress state of a tunnel structure under coupling of multiple factors including tunnel burial depth, bias state and surrounding rock grade can not be comprehensively considered, and application of earthquake load is achieved creatively through connection with the vibration table. Furthermore, the testing device is not limited to simulation of a single tunnel and is also suitable for simulation of an intersecting tunnel, and simulation of multiple work conditions can be achieved.

Description

technical field [0001] The invention relates to the technical field of indoor testing of tunnel structures, in particular to an indoor testing system and method for static and dynamic response characteristics of multifunctional scaled-down tunnel structures. Background technique [0002] In recent years, with the continuous expansion of the scale of cities in our country and the rapid expansion of urban population, in order to alleviate the traffic congestion in cities, there has been an upsurge of subway construction all over the country. However, due to the relatively weak experience in my country's subway construction, many problems and hidden dangers have also emerged under the wave of large-scale construction. For example, due to the constraints of surface buildings, underground pipelines, and social and political factors, various near-level construction projects continue to emerge; due to the needs of transportation functions, some subway lines must also cross earthqua...

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Problems solved by technology

[0004] Invention Publication No. CN104748993A Directly using jacks to load the tunnel lining cannot consider the load-bearing effect of the surrounding rock structure itself; the load applied by the gasket as a force-transmitting structure as a local surface load cannot simulate the surrounding rock pressure well, and it is easy to Cause stress concentration; the jack loading equipment used does not have corresponding digital display equipment, so it is difficult to quantitatively measure the magnitude of the applied force

[0005] Invention Publication No. CN103996348A directly using aluminum alloy hollow tubes to simulate the tunnel structure cannot reflect the geometric and material properties of the shield tunnel structure; it cannot adjust the soil stress in the box according to the actual engineering, and it is difficult to simulate bias and deep buried conditions. The stress state of the soil; at the same time, no corresponding measures were taken to reduce the influence of the boundary effect caused by the high rigidity of the steel box

[0006] In addition, the above-mentioned indoor test devices can only apply static loads, and cannot reflect the impact of dynamic loads, especially seismic loads, on the tunnel structure

[0007] Generally speaking, the existing tunnel structure test devices at home and abroad cannot simulate the interaction state between the tunnel structure and the surrounding rock under different buried depth conditions well, and at the same time, they cannot consider the impact of seismic load on the tunnel structure.

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