Rock Mechanics and Geotechnical Engineering Research Quiz

Rock Mechanics Research Summary

• The text discusses various studies on rock mechanics and tunnel breakout behavior conducted by different researchers.
• Ortlepp (1997) and Read and Martin (1996) are mentioned as authors of studies related to borehole breakout and tunnel breakout, respectively.
• Rock strength, influenced by microstructures, is highlighted as a key factor affecting brittle rock failure in tunnel breakout (Martin, 1997).
• The text mentions that rock stress plays a role in brittle rock failure during tunnel breakout (Read et al., 1998).
• The presence of un-symmetrical breakouts in tunneling is attributed to massive quartzite, according to Ortlepp (2001).
• The text references specific numerical values for rock stress and breakout dimensions, such as 230, 227, 210, 200, 170, 157, 147, 140, 110, 80, 85, and 100.
• It is noted that the studies involve a significant amount of repetition of the author's name, MingCai.
• The text does not provide a clear explanation of the specific findings or methodologies of the studies mentioned.
• The studies are focused on understanding the factors and conditions leading to tunnel and borehole breakout in rock formations.
• The studies cited in the text are from the field of rock mechanics, which involves the study of the behavior of rocks under different conditions and the applications of this knowledge to engineering and construction projects.
• The text suggests that the mentioned studies are relevant to understanding the behavior of rock formations during underground construction projects such as tunneling and borehole drilling.
• The text does not provide a clear indication of the specific relevance or implications of the research findings.

Geotechnical Engineering Research and Findings

• The text discusses various studies in geotechnical engineering conducted by Ming Cai, focusing on the effects of excavation size on wedge size, stress-induced rock failure modes, stress-induced fractures, and diking in overcored samples.
• Ming Cai's research includes studies on the effect of excavation size on wedge size, stress-induced rock failure modes, stress-induced fractures, and diking in overcored samples.
• Kaiser et al. (2000) is cited in the context of stress-induced rock failure modes.
• De La Vaissière et al. (2014) is referenced in the discussion of stress-induced fractures, particularly related to shear fractures in claystone and tensile fractures.
• Cai (2016) is cited in the context of stress-induced fractures, particularly in relation to marble and tensile fractures.
• Cai (2001) is mentioned in the discussion of diking in overcored samples, specifically in the context of overcored samples from the URL.
• The use of a stepped drill bit is noted to be less likely to cause fractures in overcored samples from the Garson Mine (dyke), as indicated by Cai (2005) and Zhong et al. (2018).
• The presence of disking in overcored samples is discussed in relation to the URL and the use of a stepped drill bit as a sign of high in-situ stress or induced stress.
• The research encompasses a range of geological materials, including marble and claystone, and is conducted in various locations such as the Jingping Underground Research Laboratory.
• The studies cover a variety of geotechnical phenomena, including the impact of excavation size on wedge size, stress-induced rock failure modes, stress-induced fractures in different materials, and the occurrence of disking in overcored samples.
• The studies are conducted by Ming Cai and involve collaboration with other researchers, as evidenced by the citations of Kaiser et al. (2000), De La Vaissière et al. (2014), Cai (2016), Cai (2001), and Zhong et al. (2018).
• The findings provide valuable insights into the behavior of geological materials under various conditions and have implications for geotechnical engineering practices.