Research on optical method of menchanical property of anchorage segment of full-length retrievabl resin bolt

Mechanical characters of full-length recoverable resin bolts bonding segment are different to common recoverable end-resin bolts,and it is necessary to study them.the author uses flexible glue undergo photoelastic test.In this test,the author plays stress on observing lines of equal shear and discover the distributing characteristic of maximum shear stress nearby bonding segment: the sheer stress of the bolt's anchored part gets maximum value at the bottom of the hole,and decreases in the axial direction.