Experimental Investigation and Numerical Modelling on Strength and Fracture Behaviors of Sandstone with Weak Distributed
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ORIGINAL PAPER
Experimental Investigation and Numerical Modelling on Strength and Fracture Behaviors of Sandstone with Weak Distributed Inclusions Zhenlong Zhao . Hongwen Jing . Xinshuai Shi
Received: 6 September 2020 / Accepted: 16 November 2020 Ó Springer Nature Switzerland AG 2020
Abstract In the diagenetic process of sedimentary rocks, inclusions widely exist in geological rock mass due to the intrusion of different lithologic rocks. In this paper, uniaxial compression experiments were performed on the sandstone specimens with weak inclusions of different distribution. The influence of inclusion arrangement on the strength and failure mode of the complex was analyzed. Due to the difference of lithology between inclusions and matrix, the mechanical behavior of specimens is different from that of homogeneous materials. Based on the laboratory experiments, the deformation and failure process of the composite model is further analyzed from the perspective of crack field and displacement field evolution by using the particle flow code. Indeed, the interaction mechanism and progressive nonlinear fracture behaviors between inclusions were discussed through the process of stress accumulation and transfer between the matrix and inclusions. The results show that the arrangement of inclusions can significantly affects the mechanical behaviors of composite
Z. Zhao H. Jing X. Shi (&) State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China e-mail: [email protected] Z. Zhao e-mail: [email protected] H. Jing e-mail: [email protected]
specimens. In particular, due to the evolution process of the concentrated stress between the inclusions and matrix, the penetrating surface between inclusions and macroscopic fracture surface of specimens were successively formed, which resulted in the failure of the composite specimens showing the progressive nonlinear fracture characteristic. Furthermore, the interaction mechanism and progressive nonlinear fracture behaviors between inclusions are discussed through the process of stress accumulation and transfer between the matrix and inclusions. Keywords Mechanical properties Composite rocks Sedimentary sandstone Weak inclusions Particle flow code
1 Introduction The sedimentary sandstone with weak inclusions exist widely in geological environment. In the field of rock mass engineering, such as underground mining, tunnel excavation and chamber construction, the mechanical responses of surrounding rock mass are very important to the stability of engineering structure in the process of design and construction (Rubino et al. 2014; Han 2018; Quesada et al. 2009). Rocks in the subsurface may be considered as uniform material. In general, due to the intrusion of weak or stiff inclusions, the rocks containing inclusions were also considered as a
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Geotech Geol Eng
composite material composed of matrix, inclusions and the interface betwee
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