Abstract：Serious floor heave of the haulage tunnel at the southern –190 m level was a great problem in Gequan coal mine in China. The main physical and mechanical properties of surrounding rocks around the roadway are tested. On the basis of the study of large range of rock mass around the roadway，the factors resulting in the floor heave are analyzed. Through numerical modeling with UDEC3.1，the plastic region and stresses distribution around the roadway are understood under the original support. Thus，the principal factors resulting in floor heave i.e.，the properties of surrounding rock，water，and support form，are released. With the recognition of the mechanism of the floor heave，the control scheme that whole section grouting is combined with side and corner bolt reinforcement is put forward. Through numerical modeling，the support parameters of the new scheme are optimized. In-situ measurement shows that good result of controlling the floor heave is obtained with the scheme.
