A dynamic response test device and test method for simulating the lateral impact load of a tunnel in a meso-seismic region

Abstract

The present invention discloses a device of dynamic response test for simulation of a meizoseismal area tunnel suffered from side-direction impact load. The device comprises a counter-force frame, a test box, a spring, a chute and a support; the upper portion, the bottom portion, the left portion and the right portion of the counter-force frame are provided with steel plates, the test box is arranged in the counter-force frame, the upper portion, the left side wall and the right side wall of the test box are correspondingly connected with the steel plates located at the upper portion, the leftside and the right side of the counter-force frame through the spring, a horizontally freely sliding steel ball in a left and right direction is arranged between the test box and the steel plate at the bottom portion of the counter-force frame, the bottom portion of the chute is provided with at least one support for fixing the chute. The device can really represent the response equation and theresponse mode of the meizoseismal area tunnel suffered from side-direction impact load to provide accurate and reliable suggestion for engineering structural design and geologic hazard prediction, andis simple in structure, easy to manufacture and easy to operate, and the test method is simple, economical and reused.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, in particular to a dynamic response testing device and a testing method for tunnels in extremely seismic regions. 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 its propagation speed in the crust is 5.5-7 km / s. It reaches the epicenter first, also known as P wave, which causes the ground to vibrate up and down and is relatively weak in destructiveness. 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 m...

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Problems solved by technology

[0005] Earthquake dynamics are very complex. Numerical methods are often used for simulation in current research. At the same time, large-scale model tests such as shaking table tests and dynamic centrifugal model tests are often used to simulate earthquake effects. However, there are few test devices involving simple earthquake dynamics simulations that can reproduce The Response of Tunnel Surrounding Rock Under Different Intensity Seismic Wave Shear Wave Dynamic Action

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