Citation

Bai C, Wang L, Liu S, Lu S, Nie W. China Saf. Sci. J. 2021; 31(9): 174-183.

Copyright

(Copyright © 2021, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2021.09.024

PMID

unavailable

Abstract

In order to study seismic performance degradation characteristics of goaf edge buildings under influence of coal mining,RC frame structure at the edge of goaf was taken as research object, factors such as surface subsidence, non-uniform settlement of buildings and seismic force under coal mining disturbance were considered. Mining simulation test bench was designed to simulate bidirectional non-uniform settlement of buildings under the four working conditions of 0, 2, 4 and 6 mm / m. Based on theory of uniform similarity rate, a scaling model with a similarity ratio of 1/10 was designed to conduct dynamic test under action of El-Centro waves at the intensities of 7 and 8 degree. Natural frequency of model was obtained by white noise sweep, and dynamic responses such as acceleration amplification coefficient, interlaminar deformation, energy time-history response, strain response, failure characteristics of model structure were studied. The test results show that under influence of mining, buildings had different degrees of initial damage, which are mainly concentrated at the bottom of the structure. In the effect of earthquake, the greater the influence of mining, the more significant the structural dynamic response increases, and the greater the structural stiffness reduction. When intensity of earthquake increases, plastic damage and deformation increase, and structural rigidity decreases sharply, and weak layer expands to the upper layer in the working conditions with large mining influence. © 2021 China Safety Science Journal

Language: zh