Test device for simulating tunnel seismic response under fault movements and test methods

Abstract

The invention discloses a test device for simulating a tunnel seismic response under fault movements, which comprises a vibration table, a model test box, a guide rail underframe, a guide rail, a calibrated rod, a spring matrix, a spring mounting plate, a load-bearing bottom plate, an adjustment connecting rod, a fixed bearing, a mobile bearing, a lifting drawer, a jack base and a hydraulic jack. The invention further discloses two test method adopted by the test device for simulating the tunnel seismic response under the fault movements, and the two methods are respectively used for normal fault simulation and reverse fault simulation. A dynamic response of a seismic action in a condition that a fault movement force acts on a tunnel model can be realized by adopting the test device disclosed by the invention, the fault movement force is provided by the hydraulic jack, faults with any inclination angle can be simulated, and the spring matrix can ensure continuous dynamic movements of a hanging side soil body when the vibration table is in operation, so that stress of the tunnel model is enabled to be more consistent with actual situations, the authenticity and the precision of a test result are significantly improved, and research on anti-seismic and shock absorption design of a fault crossing tunnel is facilitated.

Description

technical field [0001] The invention relates to a tunnel anti-seismic test device, in particular to a test device and a test method for simulating the seismic response of a tunnel under fault dislocation. Background technique [0002] The 5.12 Wenchuan Earthquake in Wenchuan, China in 2008 resulted in varying degrees of damage to a number of tunnels. Among the total 57 tunnels investigated, 49 had concrete block cracks, falling, or even steel bar bending in the lining of 49 tunnels. destruction. [0003] The survey shows that when the tunnel passes through the active fault zone, the fault movement will produce a shearing effect on the tunnel structure. Under the action of the earthquake, the supporting structure of the tunnel will be subjected to a greater shearing effect, and the tunnel lining will be structurally damaged. In severe cases, it may cause Casualties and losses, and it is difficult to recover in time due to traffic interruption, and it is also impossible to ca...

AI Technical Summary

Problems solved by technology

[0004] The test device for simulating the seismic response of tunnels can be referred to as the earthquake model test device. The existing seismic model test devices cannot simultaneously consider the shear action of fault dislocation and the impact of earthquakes on the tunnel, and cannot simulate the continuous occurrence of faults when the tunnel is subjected to seismic loads. This makes the experimental process not highly consistent with the actual situation, and the authenticity and accuracy of the test results are not high enough, which is not conducive to the research on the anti-seismic design of tunnels crossing faults

Images