基于采动过程的工作面底板涌水量计算

Calculation of floor water inflow of working face based on mining process

为获得与煤层工作面采动过程节点相关联的最大与正常涌水量实用计算方法,针对“集水廊道法”进行改进研究,理论分析了计算参数的取值方法,以开滦东欢坨矿北二采区煤12-1首采工作面为例进行了应用与效果检验。结果表明,改进后“集水廊道法”公式中,最大水力梯度与煤层底板初始承压高度有关,稳定水力梯度取决于含水层渗透性,最大水力梯度与稳定水力梯度分别用来计算最大涌水量与正常涌水量;用于涌水量计算的含水层厚度受到工作面倾向斜长的显著影响;廊道计算长度取决于推采长度、工作面总长度与水位影响半径之间的关系。经2224工作面应用检验,实测涌水量介于预测最大涌水量与正常涌水量之间,其变化趋势与预测正常涌水量相似,预测效果良好。

In order to obtain the practical calculation method of the maximum and normal water influx associated with the node of the mining process of the coal seam working face,the"water collection corridor method"was improved and the value method of the calculation parameters was analyzed theoretically.The application and effect test were carried out with the first mining face 12-1 in the north second mining area of Kailuan Donghuantuo Coal Mine as an example.The results show that the improved"water collection corridor method"formula,the maximum hydraulic gradient is related to the initial pressure height of coal seam floor,stable hydraulic gradient depends on the permeability of the aquifer,the maximum hydraulic gradient and stable hydraulic gradient are used to calculate the maximum and normal water influx.The thickness of the aquifer used for the calculation of water surges is significantly influenced by the inclined slope length of the working face.The calculated length of the corridor depends on the push mining length,the total length of the working face and water level influence radius.By 2224 working surface application test,the measured water inflow is between the predicted maximum water inflow and normal water inflow,and its change trend is similar to the predicted normal water inflow,with good prediction effect.