Proceedings of GeoShanghai 2018 International Conference: Rock Mechanics and Rock Engineering by Lianyang Zhang Bruno Goncalves da Silva & Cheng Zhao

Author:Lianyang Zhang, Bruno Goncalves da Silva & Cheng Zhao
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

(2)University of Chinese Academy of Sciences, Beijing, 100049, China

(3)School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, 100083, China

Xiao-shan Shi

Email: [email protected]

Jing-rui Niu (Corresponding author)

Email: [email protected]

Abstract

The investigation on anisotropy of shale in mechanical and psychical characteristics is of great significance to successful implementation of hydraulic fracturing in gas shale exploitation. In this paper, the effect of shale anisotropy on tensile strength was studied via Brazilian splitting tests (BD) at different loading angles (the angle between loading axis and the stratification). The specimens were prepared along different angles (0°, 30°, 45°, 60°, 90°) with respect to the stratification of black shale (BS). The results indicate that the tensile strength for samples with different loading angles exhibits obvious anisotropy. It was noted that complex tensile fractures can be formed under larger loading angels. Studying the tensile strength anisotropy of shale can provide some theoretical guidance for optimization of fracturing scheme and fracture evaluation.

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