Loading experiment process

safety monitoring method and results of rock-anchored beam in Jinping I hydropower station underground powerhouse

are introduced. The results show that anchor stress

crack openings

rock deformation and anchoring load losses are caused by secondary stress; their increments caused by test loads is far less than monitoring physical quantities; most of the anchor bolts stresses are tensiles. C anchor stress increment reflects more sensitive than A

B anchor stress increments; anchor stress increment diminishes quickly with the buried depth increases; during the whole process

all levels of load variation monitoring physical quantities are less than their design control standard values. It is suggested that the rock anchor beam design and construction should consider surrounding rock and rock anchor beam jointed effects in surrounding rock deformation.