E3S Web Conf.
Volume 283, 20212021 3rd International Conference on Civil, Architecture and Urban Engineering (ICCAUE 2021)
|Number of page(s)||6|
|Section||Research on Civil Engineering and Geotechnical Hydrological Structure|
|Published online||07 July 2021|
Experimental Study on Influence of Unloading Rate on Creep Characteristics of Marble under High Stress
Zhejiang Guangchuan Engineering Consulting Co, Hangzhou 310020, China
* Corresponding author: firstname.lastname@example.org
In the engineering of high stress area, the measures to control the stability of surrounding rock by reducing excavation footage and excavation speed are to adjust the unloading rate of surrounding rock caused by excavation. In this study, unloading creep tests of marble under high stress conditions were carried out to study the effect of unloading rate. Research results showed that the axial and lateral instantaneous strain and creep strain of the sample increased with the increase of unloading rate; the lateral creep characteristic of marble under unloading condition was stronger than that of axial creep characteristic, and it was more obvious with the increase of unloading rate; the failure of specimens under unloading creep condition was mainly caused by the rapid increase of lateral strain, and the brittleness of rock was increasing with the increase of unloading rate. The Burgers model was used to describe the creep curves of specimens, and the variation of the parameters with the unloading rate was analyzed. The fitting results showed that the instantaneous elastic modulus E1, E'1 and the viscosity coefficients η1, η'1 all decreased with the increase of the unloading rate, which can be described by linear relationship within the unloading rate range of this experiment. Compared with the time of whole creep tests, the time for each specimen to enter the steady-state creep was similar, it was considered that the effect of unloading rate on η2/E2 and η'2/E'2 can be ignored.
© The Authors, published by EDP Sciences, 2021
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