The effect of initial damage induced by stress on the time-dependent behaviour of Beishan granite

Author:

Yu Peiyang12,Pan Peng-Zhi12ORCID,Chen Jianqiang3,Miao Shuting12,Wang Zhaofeng12,Wu Zhenhua12

Affiliation:

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China

2. University of Chinese Academy of Sciences, Beijing 100049, China

3. Shenhua Xinjiang Energy Company Limited, Urumqi 830027, China

Abstract

To understand the time-dependent fracture behaviour of hard rock in the excavation damage zone, a series of stress paths are designed to obtain the same initial damage extent induced by excavation. The influence of initial damage under different stress states on the creep process of Beishan granite is investigated experimentally. A unified indicator, i.e., the time-dependent fracture potential index ( ξTFPI), is proposed to conveniently describe the effect of applied stress on the creep process. The results show that the time-dependent strain increases with increasing initial damage extent and is significantly affected by the applied stress at a given initial damage extent. Under the same initial damage extent, with the increase in ξTFPI, the larger the primary creep strain rate and secondary creep strain rate are, and this phenomenon is more obvious in the lateral creep results. The secondary creep strain rate increases with increasing ξTFPI, and the increasing trend of the axial secondary creep strain rate with ξTFPI is greater with a higher initial damage. Finally, a quantitative relationship of the secondary creep strain rate with the initial damage and ξTFPI is established and validated against the experimental results.

Publisher

Canadian Science Publishing

Subject

Civil and Structural Engineering,Geotechnical Engineering and Engineering Geology

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