Model experiment on dynamic behavior of jointed rock mass under blasting at high-stress conditions. (April 2018)

• Record Type: Journal Article
• Authors: Yang, Renshu; Ding, Chenxi; Yang, Liyun; Chen, Cheng
• Is Part Of: Tunnelling and underground space technology. Volume 74(2018)
• Page Start: 145
• Page End: 152
• Publication Date: 2018-04
• Subjects: High stress condition -- Joint -- Blasting -- Crack initiation -- Crack propagation; Tunneling -- Periodicals; Underground construction -- Periodicals; Tunnels -- Periodicals; Underground areas -- Periodicals; 624.193
• DOI: 10.1016/j.tust.2018.01.017
• Languages: English
• ISSNs: 0886-7798

Abstract

Highlights: The blasting response of joint under high-stress conditions is studied. Crack initiation mode and initiation angle at the joint are analyzed. High-stress condition enhances shear failure of the crack initiation. The minimum strain energy density factor can predict crack initiation behavior. Abstract: The blasting response of jointed rock mass under high-stress conditions is studied in a laboratory experiment using model specimens. The crack initiation mode and initiation angle at the joint are analyzed, as well as the stress intensity factor and crack velocity. The blasting stress wave increases the stress concentration at the joint which promotes crack initiation and propagation. The dynamic behavior of the crack can be divided into two stages – the initiation stage and the propagation stage. The theoretical criterion based on the minimum strain energy density factor can well predict and explain the crack initiation behavior under blasting loading. The high-stress condition enhances the degree of shear failure of the crack initiation at the joint, which has significant effects on the dynamic behavior of subsequent crack propagation and leads to larger crack initiation angles.