ABSTRACT
N2105 mining face of Yuwu coal mine, in Shanxi Provence of China, are in conditions of low bursting of coal stratum, roof and floor. Combined action of static and dynamic load on coal and rock can induce the occurrence of rockburst. The prevention of rockburst needs to be consider on two aspects: (1) change the mechanical properties of coal and rock to weaken the capability to store elastic energy, (2) modify the stress state of coal and rock to decrease the degree of stress concentration. The prevention measures of pre-split blasting and destress drilling were put forward. A numerical model established by FLAC3D was investigates the stress evolution in surrounding rock and coal pillar during the implementation of prevention measures. The pre-split measure reduces the disturbance of roof fracturing and destress drilling measure can bring down the degree of stress concentration. In field test, sandstone strata with height from 23 m to 32 m was target region for pre-split blasting and the drilling borehole in pillar range from 20 m to 30 m in length. The implementation of comprehensive measures guaranteed N2105 working face was in normal production and advanced 1200 m securely.
