Abstract:Under engineering stresses in colliery,deformation of multiple structure of roadway surrounding rock is complex and unbalanced. The soft structure has important influence on shape of failure zone,process of deformation and stability of rock mass. There are eleven kinds of soft structures such as roof and floor and two sides with single property soft structures,layered soft structure of sides,coal and rock pillar soft structure,engineering stress and sectional shape soft structure,which can be divided into three types of rock feature,geometric shape and stresses by multiple structures and engineering stresses. Deformation of soft structure has failure effect that whole failure process of surrounding rock and supports is from failure of soft rock whose intensity is low and degree of stress concentration is high. Probing records of the ground penetrating radar in colliery present that shapes of failure zone are different and singular on interfaces of different rock masses whose diversity of rock properties is obvious. Soft structure has the leading role in the shape of failure zone,different type of soft structures has the great diversity to the shape of failure zone;and the thickness of failure zone is bigger than that in places else. Equal supporting patterns used frequently don¢t match to the deformation characteristic of soft structures in roadway;therefore,by high supporting strength on soft structure and unbalanced supports,deformation and failure of whole surrounding rock may be controlled effectively.