Determination of advancing distance of sealing hole for water-releasing borehole in working face floor

In order to decrease the influence of advancing abutment pressure on water-releasing borehole around working face during mining process, it is necessary to research advancing distance of sealing hole of water-releasing borehole in floor. An engineering geological model was established taking Ⅲ610 isolated working face of Yangzhuang Coal Mine as an example, and influence range of advancing abutment pressure of the working face during mining process was researched by use of FLAC3D numerical simulation software. The simulation result shows that the influence range is 20-30 m. The influence range of advancing abutment pressure was also theoretically calculated with a result of 29.81 m when considering repeated mining influence, which was basically consistent with the numerical simulation result. According to results of numerical simulation, theoretical calculation and field test, advancing distance of sealing hole of water-releasing borehole in floor of Ⅲ610 isolated working face is determined as 30 m, and its rationality was verified by practice.