Uniaxial Compression Study on Mechanical Properties of Artificial Rock Specimens with Cross-Flaws
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ORIGINAL PAPER
Uniaxial Compression Study on Mechanical Properties of Artificial Rock Specimens with Cross-Flaws L. X. Xiong . H. J. Chen . D. X. Geng
Received: 11 November 2019 / Accepted: 25 September 2020 Ó Springer Nature Switzerland AG 2020
Abstract Uniaxial compression tests have been performed on artificial rock specimens weaken by feathered with cross-flaws. The effects of the angle a between the primary joint plane and the loading direction, the angle b between the primary joint plane and the secondary joint plane, the length of the primary joint plane, the length of the secondary joint plane, and the number of secondary joint planes on the mechanical behaviors of artificial rock specimens have been studied. Research results show: (1) For artificial rock specimens with two intersecting joint planes of equal length, the uniaxial compressive strength (UCS) is generally higher when the primary and the secondary joint planes are more symmetrically L. X. Xiong (&) School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China e-mail: [email protected] L. X. Xiong Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China H. J. Chen Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing, China e-mail: [email protected] D. X. Geng School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China e-mail: [email protected]
distributed on both sides of the loading direction. This is mainly due to a shear failure being less likely to occur in this configuration. When the angle b between the primary joint plane and the secondary joint plane remains constant, the UCS of specimens is lowest when the primary joint plane is perpendicular to the loading direction. (2) When the model specimen contains two joint planes and the angle a is the same, the change of the UCS with angle b from 0° to 90° is the same for artificial rock specimens with different lengths of the secondary joint plane. When the angle a and the angle b both remain unchanged, the UCS of the artificial rock specimen decreases with increasing length of the secondary joint plane. (3) When the model specimen contains varied (or equal) lengths of joint planes, the UCS of the specimen decreases with increasing number of secondary joint planes. The UCS does not change substantially when the number of secondary joint planes exceeds 4. Keywords Artificial rock specimen Cross-flaws Uniaxial compressive strength (UCS)
1 Introduction Natural rock fractures and joint planes have a significant influence on the mechanical properties of rock masses. Jointed rocks are commonly observed in construction of various projects, which has been a hot
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Geotech Geol Eng
topic over the last five decades. Therefore, it is of great practical significance to carry out research on the influence of geometrical parameters of joints on the strength and failure modes of jointed
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