Floor Heave Law and Control Technology of Roadway Within Coal Face Sagging Subsidence Zone

In order to solve the problem of a large engineering quantity of tunnel heading while mining coal resources left, the site observation was applied to analy ze the law of roadway deformation under dynamic pressure and proposed floor heave control scheme. The results showed that under the condition of original support m ajor deformations were floor heaves of roadway which was affected by the lower mining face, the largest deformation value was 788 mm; The acuteness of floor heave zone of roadway occurs in the interval from 35 m in front of the working face to 13 m in the rear of the working face, the floor heave accounted for 76% ~ 81%. The pap er proposed roadway temporary support and bottom anchor strengthen scheme, which could effectively controll the floor heave of roadway under the conditions of dyna mic pressure.