Abstract
The seepage-control design and evaluation of underground water conservancy projects need to consider the effects of water and original fissures on rock mechanical properties and fissure evolution laws. In this paper, uniaxial compression test was conducted on siltstone samples containing prefabricated fissures with different moisture contents to investigate the effects of fissure angle, ligament angle, and moisture contents on the mechanical properties and crack propagation. The results show that the peak stress, elastic modulus, and peak strain of rock are positively correlated with fissure angle and negatively correlated with the ligament angle. With increasing moisture content, the effects of fissure angle and ligament angle on rock mechanical properties gradually decrease, and the peak stress and elastic modulus are negatively linearly correlated with moisture content. The acoustic emission (AE) and photographic monitoring techniques were adopted to analyze the dynamic evolution laws of micro-crack propagation, and seven types of crack initiation and seven kinds of crack coalescence modes were summarized. The failure characteristics and crack coalescence of rock are controlled by fissure angle and ligament angle, and water content has an impact on the whole crack evolution process. This study provides a significant understanding of the instability and failure of underground rock engineering.
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