Surrounding Rock Control Technology of Gob-side Entry Retaining in Alternative Variational Roof

The article analyzes alternative variational lithologic character roof of 1252（1）face track crossheading in Panyidong Mine. Under the condition of lower supporting strength in tunneling, the roadway is divided into two types including compound roof type and sandstone roof type according to the roof lithology. Roof structure is changed by applying pre-splitting blasting technique. Hollow grouting anchor cable is used to reinforce and strengthen the entry. The performance of bearing capacity of soft surrounding rock is improved. In the situation of two types of roofs alternately appearing, pre-splitting blasting and support parameters are adjusted in time. By using these methods, deformation failure of surrounding rocks under the condition of mining is decreased.