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ORIGINAL PAPER

Experimental Study on Mechanical Properties of Anchored Rock-Like Material with Weak Interlayer Under Uniaxial Compression Ming-yang Ren . Qiang-yong Zhang . Shang-yuan Chen . Long-yun Zhang . Yu-yong Jiao . Wen Xiang

Received: 16 October 2019 / Accepted: 10 April 2020 Ó Springer Nature Switzerland AG 2020

Abstract The weak interlayer in rock mass is an important factor affecting the stability of geotechnical engineering. In practical engineering, bolt is widely adopted to reinforce the rock mass with weak interlayer. In order to investigate the anchorage mechanical properties of rock with weak interlayer, we employed cement mortar and gypsum to simulate rock and weak interlayer and then conducted a series of uniaxial compressive experiments of anchored rock-like material. Our experimental results show that: (1) the weak interlayer significantly increases the heterogeneity and anisotropy of rock mass, resulting in many fluctuations on the stress–strain curve. Compared with the nonbolted rock, the stress–strain curve of anchored rock

M. Ren (&)
Q. Zhang (&)
S. Chen Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, Shandong, China e-mail: [email protected] Q. Zhang e-mail: [email protected] L. Zhang Logistics Security, Shandong University, Jinan 250100, Shandong, China Y. Jiao Faculty of Engineering, China University of Geosciences, Wuhan 430074, Hubei, China W. Xiang School of Qilu Transportation, Shandong University, Jinan 250061, Shandong, China

exhibits stronger ductility; (2) for the non-bolted rock with inclined interlayer, the uniaxial compressive strength, elastic modulus and Poisson’s ratio decreases gradually with increasing interlayer inclination. (3) The influence of the dip angle of the weak interlayer on the failure modes of rock mass with weak interlayer is more notable than anchorage angle. The failure modes of anchored rock with weak interlayer can be divided into four patterns: splitting failure of weak interlayer, splitting failure of both weak interlayer and rock, composite failure of weak interlayer splitting and rock shear fracture as well as composite failure of weak interlayer splitting and rock-interlay interface shear slip. Keywords Anchorage mechanical property
Rocklike material
Weak interlayer
Uniaxial compression test
Interface slip

1 Introduction Natural rock mass is a kind of typical defective material which usually contains a lot of discontinuities (such as fissures, joints, and weak interlayers, etc.) under the long-term tectonic movement (Liu et al. 2016; Zhou et al. 2016). These flaws have a profound impact on the strength and deformation of rock mass, and threaten the safety and stability of geotechnical engineering (Li et al. 2011; Ren et al. 2019a). In most

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Geotech Geol Eng

cases of engineering, it has been proved that as a commonly reinforcement element, the bolt can effectively improve the structure and performance of rock mass and decrease