In situ damage testing of rock mass in large underground cavern

摘要

To understand the spatial damage and deterioration mechanism of rock materials duringnexcavation, an in situ test is carried out in an underground cavern 28?5 m in width, 21 m in heightnand 325 m in length. In this experimental cavern, the spatial distribution and intensity of rockndamage are exposed by non-destructive ultrasonic testing after excavation. The distributionnfunction of spatial damage has been calculated based on the measured data. To protect wallnrock, reparative measures of damaged rocks are discussed based on the measured results andnthe conception of damage reparation, which gives inspiration to the underground engineeringndesign.