【摘要】 矿井水害是因井巷和采掘工作面与含水层、地表水体或含水的裂隙带、溶洞、构造破碎带等接近或沟通而突然发生的出水事故,由于其突发性和出水量巨大的特点,常常影响矿山生产甚至造成淹井等严重后果。断裂带作为岩体内的低强度带,受矿体开挖影响常常产生断层活化现象,而有可能成为矿坑突水的通道。本文根据三山岛金矿新立矿区海底采矿的地质条件,结合实际工况,采取数值模拟方法,对矿床开采引起断裂带活化的状况以及上覆海底粘土隔水层的沉陷变形进行了分析。模拟结果表明:断裂带与上盘围岩接触带是受到开采扰动强烈的地带,断裂带和上覆海底粘土隔水层的阻水效应随着采场的逐渐上移而弱化,当开采至-135m水平时,海底矿山的生产安全将受到海水溃入的威胁。更多还原

【Abstract】 Being a water yielding accident,water disaster in a mine happened suddenly when mine shafts or mining faces got close or connected to aquifers,surface water,water-filled fracture zones or karst caves.It often set back mine productivity or even caused flooding because of its sudden break-out and enormous quantity.As the fracture zone was generally a low strength region in the rock mass,mining the ore body often made a fault active,which probably formed a pathway for water bursting.Based on the geological conditions of submarine mining in Xinli mining area of Sanshandao Gold Mine and the practical working conditions,the paper analyzed the status of fracture zone’s activation and of the subsidence deformation of the upper clay confining beds by the use of numerical simulation.The results showed that the contact zone between the fracture zone and the upfaulted wall rock would be strongly disturbed by mining.The watertight capacity of the upper clay confining bed decreased as the stope shifted up.When mining to-165m,the fracture zone and its accompanied fractures on both sides would spread and connect to the upper confining bed and sandy soil layer,forming an aquiduct for seawater to the stope.The safety of undersea mining would be threatened by seawater pouring.更多还原