DYNAMIC RESPONSE CHARACTERISTICS OF TUNNEL INVERT UNDER HIGH GROUND STRESS
The construction of high ground stress tunnels is increasing over years,and structural cracks are inevita-ble in tunnels under the action of ground stress.This paper studies the relationship between the initial cracks and the propagation of train vibration response.The internal vibration and damping characteristics of an arch structure under high ground stress conditions are investigated by numerical simulation methods,considering different sizes of pre-set fractures at the foot and center of the arch and on the side of the track.The research findings indicate that the presence of initial fractures leads to varying degrees of fluctuation in the internal vibration response of the arch,with the peak response showing a decreasing-then-increasing trend along the vertical direction of the arch.The re-sponse amplification caused by fractures at different locations varies,primarily due to changes in fracture width caus-ing greater response amplification than changes in depth.In practical engineering,appropriate fracture control mea-sures should be implemented based on the varying degree of structural fracture risks at different locations.
high ground stresstrain vibrationinvert crack damagedynamic response
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