矿井涌水量动态预测非稳定释水-断面流法

Unsteady Water Release Cross Section Flow Method Based Mine Water Inflow Dynamic Prediction

我国北方煤田上覆地下水系统含水层以砂岩为主,是矿井主要充水水源。除浅部、露头区外,上覆砂岩地下水系统总体上构成非径流型蓄水构造,弹性贮存是其地下水主要赋存状态,压力传导、局部渗流为地下水动力学模式,矿井涌水主要为承压含水层弹性释放。非充填开采,煤层上覆地层周期性冒裂形成冒裂二元结构体,其自身释水(弹性、重力)与其外侧含水层断面弹性释水叠加形成矿井涌水。冒裂二元结构体释水随冒裂周期发生,时间短暂。外侧含水层断面释水可用非稳定流定降深沟(渠)流方程描述,进而获得外侧含水层断面释水单宽流量。外侧含水层释水断面随冒裂周期性延展累积,迭代更新,矿井涌水流量随之变化。在研究、刻画外侧含水层释水断面延展、迭代时空规律基础上,给出含水层断面释水流量预测方法、公式,与冒裂二元结构体自身周期性释水流量叠加,获新的矿井涌水量预测方法—非稳定释水-断面流法。

Lithology of coalfield overlying groundwater system aquifers are mainly sandstone in northern China,the aquifers are main mine water filling source.Besides shallow part and outcrops,overlying sandstone groundwater system has contributed to non-runoff water storage structure overall.Elastic storage is the main groundwater hosting state;pressure conduction and local seepage are groundwater dynamics modes.Mine water inrush is mainly confined aquifer elastic release.During non-filling mining,coal overlying strata periodic caving and fracturing can form caving and fracturing binary structure,the superposition of itself water release(elastic,gravitational)and lateral aquifer cross section elastic release will form mine water inrush.Caving and fracturing binary structure water release happens with periodic caving and fracturing,the time is short.Lateral aquifer cross section release can use unsteady flow fixed drawdown trench(canal)flow equation to describe,and then acquires lateral aquifer cross section water release flow per unit width.Lateral aquifer water lease cross section will accumulate with caving and fracturing periodic extension,iterative renovation,and then mine water inflow will change along with.Based on study,depiction of lateral aquifer water release cross section extension,iterative spatiotemporal regular pattern have provided aquifer cross section water release flow prediction method,formula;and superposed on caving and fracturing binary structure itself periodic water release flow has acquired new mine water inflow prediction method—the unsteady water release cross section flow method.