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以松散承压含水层下采煤压架突水灾害防治问题为工程背景,基于含水层载荷传递机理设计了专门的模拟实验装置,就松散承压含水层赋存特征对其载荷传递特性及关键层复合破断的影响进行了研究。结果表明:松散承压含水层骨架颗粒粒径越大,组分越单一,含水层的流动补给性能越好,作用在基岩顶部的载荷较大,覆岩越易发生复合破断,易导致压架突水事故;骨架颗粒粒径越小,粒度组分复杂,含水层流动补给性能越差,作用在基岩顶界面的载荷易随采动降低,含水层载荷传递系数小,覆岩关键层自下而上逐层破断,不易导致压架突水事故。研究形成了含水层载荷传递系数的确定方法,在祁东煤矿的开采条件下,洪冲积扇区域含水层的载荷传递系数应为0.83~0.94,漫滩沉积区域可取0.69~0.71。
Based on the engineering background of the prevention and control of water rains inrush caused by unconsolidated confined aquifers, a special simulated experimental device was designed based on the mechanism of load transfer in aquifers. The characteristics of load transfer and its key The effect of layer composite fracture was studied. The results show that the bigger the particle size of loosely confined aquifer is, the more the single component is, the better the flowability of aquifer is. The load acting on the top of bedrock is larger and the overburden is more prone to compound rupture, Water inrush. The smaller the particle size and the more complex particle size, the worse the rechargeability of the aquifer. The load acting on the top of the bedrock tends to decrease with the mining, the load transfer coefficient of the aquifer is small, Bottom up and broken layer by layer, not easy to cause pressure racking accident. The method of determining the load transfer coefficient of aquifer was established. Under the condition of mining in Qidong Coal Mine, the load transfer coefficient of aquifer in the area of flood alluvial fan should be 0.83 ~ 0.94, and 0.69 ~ 0.71 in floodplain sedimentary area.