Prevention of buckling rockburst with water based on statics and dynamics experiments on water-saturated rock

Rockburst involves both rock statics and rock dynamics factors. Its prevention mechanism by means of water is rarely studied on the basis of rock dynamics. According to the static and impact compressive experiments on water-saturated sandstone from Kaiyang Phosphate Mine, the statics and dynamics mechanisms of prevention of rockburst under lamination spallation buckling with water are discussed based on static and dynamic failure characteristics of water-saturated sandstone from different aspects, such as structural effect of surrounding rock, boundary effect of stress wave and energy principle. Static destructions of water-saturated sandstone are shown as extension-shear failure and tensile failure, which can inhibit surrounding rock splitting into plates, so preparation process of rockburst under lamination spallation buckling is prevented. As the dynamic mechanical properties of sandstone influenced by water are significantly improved, the boundary effect of stress wave of water-softened roadway does not influence the main bearing structure of surrounding rock, and its bearing capacity can be maintained to prevent rockburst under lamination spallation buckling. The dynamic broken lumpiness of water-saturated sandstone is larger than that of air-dried sandstone, and its ability of accumulating elastic energy is weakened, therefore ejection of rock block in rockburst under lamination spallation buckling is also weakened.