doi:10.16186/j.cnki.1673-9787.2019100117

Received:2019/10/31

Revised:2020/01/13

Published:2021/01/15

Study on dynamic response test and catastrophe theory of specimens underinstantaneous unloading

GUO Yanhua1, LI Leyu1, QIAO Chen2

1.College of Civil Engineering， Hebei University of Engineering， Handan  056038 ， Hebei， China;2.College of Civil and Resource Engineering， Beijing University of Science and Technology， Beijing  100083 ， China

Abstract:In order to study the dynamic response of coal and rock mass under instantaneous unloading， cube specimens made of similar materials were used in this paper， and the experimental device designed and processed by ourselves was used to carry out instantaneous unloading test， and the deformation and failure mechanism of the specimens were analyzed through test and mutation theory. The results showed that the instantaneous unloading of the specimen was a complicated nonlinear process. Under certain confining pressure， the specimen would break suddenly. Under the condition of low stress， the vertical stress had a certain linear relationship with the transverse stress. According to the different accumulations of energy in the specimens of different loading stages， the specimens would be damaged to different degrees， and the vertical critical stress of instantaneous unloading failure of the specimens was 12. 6 MPa. Due to the nonlinear and discontinuous characteristics of the test process， the experiment mechanism was analyzed by using the catastrophe theory， and it was concluded that the vertical critical stress of the failure was about 13.27 MPa， and stronger failure would occur when the value was higher than that. The results were in good agreement with the results of the instantaneous unloading test.

Key words:similar material;instantaneous unloading;dynamic test;catastrophe theory

试件瞬间卸载动力响应试验及突变理论研究_郭延华.pdf