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Experimental Study on Failure Characteristics of Rock-Like Material with Prefabricated Primary and Secondary Cracks Zhongchang Wang . Jiahui Wang . Wenquan Zhang

Received: 5 June 2020 / Accepted: 28 June 2020 Ó Springer Nature Switzerland AG 2020

Abstract The crack propagation of rock material is an important research topic in the field of geotechnical engineering, which has important theoretical guiding significance for engineering design, construction, monitoring and maintenance. To explore the effect of prefabricated cracks on the crack propagation and rock failure characteristics of rock, the rock-like material was used to perform uniaxial compression tests on five sets of specimens with prefabricated primary and secondary cracks. It was shown that in all crack combinations, the crack firstly originated from the tip of the primary crack. When the primary and secondary cracks intersected, the crack at the tip of the secondary crack initiated later, and only the end far away from the primary crack initiated; When the primary and secondary crack was separated, the primary and secondary crack tips cracked almost at the same time; All specimens under uniaxial compression were ultimately dominated by tensile failure; the larger the distance between the primary and secondary cracks, the smaller the peak strength and the possibility of penetration. Z. Wang (&)
J. Wang School of Traffic and Transportation Engineering, Dalian Jiaotong University, 116028 Dalian, Liaoning, China e-mail: [email protected] W. Zhang College of Mining and Safety Engineering, Shandong University of Science and Technology, 266590 Qingdao, Shandong, China

Keywords Rock-like material
Uniaxial compression
Prefabricated crack
Crack propagation

1 Introduction The cracks in the fractured rock mass (Zhou 1990) extend and connect with each other, which can easily lead to catastrophic natural disasters such as earthquake (Tang et al. 2015), rock burst (Yan et al. 2018; Guo and Liu 2018), and landslip (Zhu et al. 2013). Therefore, it is of great practical significance to deeply study the deformation and failure characteristics of fractured rock mass. A relatively reliable method for studying fractured rock masses is laboratory testing. And the experimental research had evolved from early prefabricated single crack to today’s prefabricated multiple cracks. Brace and Bombolakis (1963) used photosensitive resin with single prefabricated crack for uniaxial compression test, and concluded that the airfoil cracks expanded along the direction of the maximum principal stress after initiation. Song et al. (2014) studied the effect of crack on rock strength, deformation and fracture trend by using marble with single prefabricated crack for uniaxial and biaxial loading and unloading tests,; Zhang et al. (2019) studied the relationships between stress–strain behaviors, acoustic emission characteristics, the propagation and coalescence of cracks by using rock-like material with s