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Geotechnical Challenges in Tunnelling Through Weak Rocks
Abstract Engineers associated with construction of tunnels in weak rocks are frequently met with geotechnical problems like instability of tunnels, yielding of the rock mass and excessive deformations due to squeezing. The problems are induced due to redistribution of in situ stresses around tunnel periphery caused by excavation of the tunnel. It is a challenging task to have proper understanding of the geotechnical issues before starting the excavation. The present chapter discusses some of the most challenging geotechnical issues which can be resolved in advance with characterisation of the rock mass at the site. These issues include assessing rock mass strength subject to given confining pressure for unreinforced and bolted rock mass, assessment of squeezing potential, assessment of tunnel deformation and expected support pressure. If adequate understanding on these issues is available with the designers, proper strategies may be formulated to handle problems at construction stage.
Geotechnical Challenges in Tunnelling Through Weak Rocks
Abstract Engineers associated with construction of tunnels in weak rocks are frequently met with geotechnical problems like instability of tunnels, yielding of the rock mass and excessive deformations due to squeezing. The problems are induced due to redistribution of in situ stresses around tunnel periphery caused by excavation of the tunnel. It is a challenging task to have proper understanding of the geotechnical issues before starting the excavation. The present chapter discusses some of the most challenging geotechnical issues which can be resolved in advance with characterisation of the rock mass at the site. These issues include assessing rock mass strength subject to given confining pressure for unreinforced and bolted rock mass, assessment of squeezing potential, assessment of tunnel deformation and expected support pressure. If adequate understanding on these issues is available with the designers, proper strategies may be formulated to handle problems at construction stage.
Geotechnical Challenges in Tunnelling Through Weak Rocks
Singh, Mahendra (author)
2018-01-01
24 pages
Article/Chapter (Book)
Electronic Resource
English
Geotechnical Challenges in Tunnelling Through Weak Rocks
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