Dynamic response test device and test method for simulating tunnel subjected to normal fault reverse fault seismogeny

Abstract

The invention discloses to a dynamic response test device and test method for simulating tunnel subjected to normal fault reverse fault seismogeny. The device comprises a box body and a slide rail mechanism, and the box body comprises a reaction force frame, a test box, a spring, a sliding groove and a bracket; the middle of the test box is divided into two parts including an upper disc and a lower disc. The device simulates a seismic dynamic response test of the surrounding rock of a tunnel under the coupling of horizontal and vertical ground vibration of a seismic zone by periodically dropping a test box from the sliding groove and controlling the height of a small ball and the time interval of releasing the ball, and reconstructs the seismic wave dynamic effect response process and response modes of the surrounding rock of the tunnel in an extreme seismic zone; the upper and lower disc setting of the test box simulates the influence of stratum displacement on the surrounding rock ofthe tunnel during an earthquake, and the device provides accurate reliable suggestions for engineering structure designs, geological disaster prediction and the like, and conducts seismic fortification for engineering construction.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, in particular to a dynamic response test device and a test method for simulating an epicenter tunnel subjected to an earthquake. Background technique [0002] An earthquake is a natural phenomenon in which seismic waves are generated during the vibration caused by the rapid release of energy from the earth's crust. Seismic waves are divided into three types according to the propagation mode: longitudinal wave, shear wave and surface wave. The longitudinal wave is a propulsive wave, and the propagation speed in the crust is 5.5-7 km / s. It reaches the epicenter first, also known as P wave, which makes the ground vibrate up and down, and is less destructive. The shear wave is a shear wave, and its propagation speed in the crust is 3.2-4.0 km / s. The second one reaches the epicenter, also known as the S wave, which makes the ground shake back and forth, left and right, and is more de...

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Problems solved by technology

The surrounding rock of the tunnel at the epicenter will also be dislocated, resulting in a very complex response of the tunnel surrounding rock. At present, numerical methods are often used to simulate the seismic dynamic action, and large-scale model tests such as shaking table tests and dynamic centrifugal model tests are often used to simulate. Earthquake action simulates the response of the surrounding rock in a closed test box, only considering the effect of the uniform transmission of energy on the tunnel during the earthquake, but there are few simulation test devices involving simple seismic dynamics, which can reproduce the epicenter of the tunnel surrounding rock. Earthquake dynamic response when normal fault or reverse fault occurs during earthquake

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