In this study

cyclic shear test were conducted on the crusted structural surface replicated with similar material under normal stress. The shear strength

deformation and morphology evolution characteristics of joints under cyclic shearing were studied without filling

with 3 mm yellow mud infilling

3 mm plaster infilling and 3 mm detritus infilling

respectively. It was found that the failure mode of joints developed under cyclic shearing. Joints without filling changed from shear failure to wear-out failure

while joints with yellow mud mainly showed slip failure. Joints with plaster changed from shear failure to slip failure and then to wear-out failure

while joints with detritus changed from shear failure to wear-out failure. With the increase of cyclic shear times

the peak shear stress of joints without filling and with yellow mud infilling decreased in deceleration rate

while those with plaster and detritus infilling decreased firstly and then increased in deceleration rate. These results indicate that filling material can weaken the shear strength of joints under cyclic shearing

especially for those with yellow mud filling. Under different filling conditions

the average dilation angles all reduce in deceleration rate under cyclic shearing. The shearing shrinkage is more obvious in filled joints

in which the shearing shrinkage is the smallest with yellow mud infilling and the largest with plaster infilling. The wear degree of filled joints after cyclic shear is lighter than that of unfilled joints

while the wear degree is the smallest when filling yellow mud

the wear degree is relatively biggest when filling plaster.