Constant resistance yielding support technology of mining gateway in seam with soft roof,soft coal and soft floor

In order to solve high deformation value of the surrounding rock during the driving and mining period of the mining gateway in Tertiary three soft seam,hard to support problem,multi repair and hard to keep stabilization problems,the paper analyzed the deformation failure features and mechanism of the gateway. The paper point ed out that the low compressive strength of the gateway surrounding rock,swelling with water,influenced by the mining as well as the conventional support material not suit the large deformation of the surrounding rock and broken would be the major causes to the deformation and failure of gateway. A constant resistance yield support technolo gy mainly with new constant resistance large deformation bolt( anchor) was provided. The application results of the transportation gateway in No.205 coal mining face of S outh No. 2 block showed that after the constant resistance yield support technology applied,the max floor heave of the gateway was about 350 mm. Within the allowed defo rmation scope,the max subsidence value of the roof would be about 200 mm. The completed deformation value of the gateway was highly reduced than previous support. T he support technology could effectively solve the high deformation problem of the mining gateway in the seam with soft roof,soft coal and soft floor.