Effect of water chemical corrosion on mechanical properties and failure modes of pre-fissured sandstone under uniaxial c
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RESEARCH PAPER
Effect of water chemical corrosion on mechanical properties and failure modes of pre-fissured sandstone under uniaxial compression Chuan-Gen Gong1,2,3 • Wei Wang1,2 • Jian-Fu Shao1,2,3
•
Ru-Bin Wang1,2 • Xiao-Wei Feng1,2
Received: 13 April 2020 / Accepted: 12 September 2020 Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this study, effects of chemical corrosion on mechanical properties of pre-fissured red sandstone samples are investigated. Cylinder samples containing a single fissure are fabricated and immersed in different chemical solutions. Different lengths and orientations of fissure are considered. All the pre-fissures are filled with gypsum. The apparent changes of samples due to chemical reactions are first examined. Uniaxial compression tests are then performed on chemically treated samples. The variations of elastic properties and uniaxial compression strength of tested samples are analyzed in terms of geometrical configuration of pre-fissure and different chemical solutions. Cracking patterns of samples during uniaxial compression tests are also investigated. Keywords Elastic modulus Failure mode Pre-fissured rock Sandstone Uniaxial compression strength Water chemical corrosion
1 Introduction Sandstone is widely encountered in many situations such as oil industry, underground and surface constructions and acid gas sequestration. In some cases, sandstone is in contact with chemical solutions. Its physical and mechanical properties are affected by different kinds of chemical reactions. According to previous studies, elastic modulus and shear strength of sandstones were deteriorated by chemically active solutions [3, 7, 41]. Some studies were devoted to water-assisted compaction and stress-induced
& Wei Wang [email protected] & Jian-Fu Shao [email protected] 1
College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China
2
Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China
3
CNRS, UMR9013, LaMcube, University of Lille, 59000 Lille, France
water–rock interaction in sandstones [4]. It is thus crucial to investigate the chemical degradation of those properties for the durability analysis of constructions. In most geological formations, there exist different types of natural and induced fractures [10]. Their presence modifies the process of chemical reactions. Therefore, it is necessary to investigate chemical degradation effects in fractured rocks. At the laboratory scale, chemical–mechanical tests are generally performed on samples with preexisting fissures. This has first been done on rock-similar materials. For instance, some authors have studied mechanical properties on pre-fissured samples of gypsum [2, 28], cement-based materials [27, 29, 31] and composite materials [20, 30]. In other works, the propagation and coalescence of cracks in pre-fissured samples have been investigated, for i
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