With the continuous improvement of the supporting technology of coal mine,it is more systematic in terms of type,support theory,construction technology and strength of bolt.But at present,the research on the stiffness of the composite structure of the bolt(cable)is not deep enough,so this paper will further study on the anchorage stiffness of the support.Firstly,the general situation of the development of anchor and anchor support technology at home and abroad,the classification and characteristics of ancho...