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为了安全地回采河堤下煤层,必须对河堤采动沉陷规律进行预测分析。根据百善煤矿6124工作面地质采矿条件,分别采用概率积分法和FLAC3D数值模拟,对厚松散表土层条件下的南沱河南堤进行了开采沉陷预测,并对堤体裂缝发育程度进行了研究。结果表明:概率积分法预计效果优于FLAC3D数值模拟预计,概率积分法从水平变形的临界值反映了河堤裂缝的范围,在厚松散层条件下,上山方向的河堤临界裂缝变形值应取+2 mm/m,下山方向的河堤临界裂缝变形值取+5mm/m。同时研究证明,受百善煤矿6124工作面开采影响的南沱河南堤段为不安全河堤,必须采取加固防渗安全措施才能确保堤防安全。
In order to safely recover the coal seam under embankment, it is necessary to predict and analyze the rule of river dike subsidence. According to the geological mining conditions of 6124 working face in Baishan Coal Mine, probability subsidence method and FLAC3D numerical simulation are respectively used to predict the mining subsidence of Nantuo Nan Di embankment in the condition of thick loose surface soil and to study the development of the embankment fracture. The results show that the predicted result of probability integral method is better than that of FLAC3D numerical simulation. Probability integral method reflects the range of the river embankment from the critical value of horizontal deformation. Under the condition of thick loose layer, +2 mm / m, the value of the critical crack deformation in the river embankment in the down direction is + 5mm / m. At the same time, it has been proved that the South embankment of Nantuo River, affected by the mining of 6124 working face of Baishan Coal Mine, is an unsafe embankment and must be reinforced with seepage prevention measures to ensure the safety of dike.