Abstract
The cracking characteristics of ductile rocks were studied by similar materials with sand, barite, epoxide resin, polyamide, silicone rubber and alcohol, while the cracking characteristics of brittle rocks were investigated by similar material with sand, barite, rosin and alcohol. In this paper, to enhance the application range of the rock-like materials in the field of geotechnical engineering model tests, the values of the elastic modulus and the compressive strength of the artificial rock-like materials are changed in a wide range by adjusting the amount of cementitious materials (epoxide resin, polyamide, rosin, etc). The elastic modulus, compressive strength and cracking characteristics were obtained from the complete axial stress–strain curves of the specimens made of similar materials, which were cast using the different mixture ratios. These experimental data can provide quantitative investigation on mixture ratios of similar materials of rocks to model the geotechnical engineering. Furthermore, the effect of mixture ratios on mechanical properties and crack propagation pattern of specimens were also investigated by the specimens with pre-existing flaws under uniaxial compressive tests
Highlights
The similar simulation test in rocks on the basis of the similarity theory of modeling test is an explorative method to study the mechanical properties of geotechnical materials
Zhou et al [30] and Zhang et al [31,32,33,34] studied progressive failure of brittle rocks with non-isometric flaws. Such rock-like materials and real rock materials have common characteristics for crack evolution, and differences caused by the material properties, loading methods, and specimen geometry [3536]
With regard to brittle rock-like materials, sand and barite were used as filling materials, rosin was used as cementitious material, silicone rubber, epoxide resin and polyamide were used as auxiliary adjusting agents, and alcohol was used as organic solvent
Summary
The similar simulation test in rocks on the basis of the similarity theory of modeling test is an explorative method to study the mechanical properties of geotechnical materials. Zhou et al [30] and Zhang et al [31,32,33,34] studied progressive failure of brittle rocks with non-isometric flaws Such rock-like materials and real rock materials have common characteristics for crack evolution, and differences caused by the material properties, loading methods, and specimen geometry [3536]. The composition of the raw materials used to make similar models can be basically divided into three categories according to their use: the first one is filling material acted as the skeleton, the second one is cementing material that plays a role in bonding, and the third one is auxiliary admixture served as regulation of physical and mechanical properties. With regard to brittle rock-like materials, sand and barite were used as filling materials, rosin was used as cementitious material, silicone rubber, epoxide resin and polyamide were used as auxiliary adjusting agents, and alcohol was used as organic solvent. The ratio relationship of raw material is shown in Tabs. 1 and 2
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