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由于岩石渗透率的突跳现象与底板突水现象的力学机理相同,通过进行实验室三向应力下岩石渗流实验,从力学的角度对底板突水机理进行了合理的解释,并提出了底板突水的实用突水判据.结果表明:底板突水是由于底板应力场与承压水渗流场相互作用形成的,矿山压力导致底板隔水层中的裂隙扩展贯通是底板突水的必要条件,承压水在裂隙面的法向扩张力及切向剪切力大于裂隙面的内力是底板突水的充分条件.只有同时满足充分条件和必要条件时,底板突水事故才会发生,理论分析结果与现场突水规律一致.
Because the phenomenon of sudden jump of rock permeability is the same as the mechanical mechanism of floor water inrush phenomenon, the mechanism of floor water inrush is reasonably explained from mechanics point of view through the rock seepage experiment under three-direction laboratory stress. The results show that the water inrush from the floor is formed by the interaction between the stress field of the floor and the seepage flow field of the confined water. The pressure of the mine leads to the expansion of the crack in the aquifuge floor, which is a necessary condition for water inrush from the floor. The normal expansion force of the confined water in the fracture surface and the shear force in the tangential direction that is greater than the fracture surface are sufficient conditions for water inrush from the floor.When the sufficient and necessary conditions are met simultaneously, The result is consistent with the law of water inrush on site.