中国华北型煤田矿坑涌水量预测的“准三维”数值模型研究

THE RESEARCH OF A PARA -THREE -DIMENSIONAL NUMERICAL MODEL FOR FORECASTING WATER INFLOW IN MINE IN THE COALFIELD OF NORTH CHINA

根据中国华北型煤田的特征:在剖面上有多层相互间具密切水力联系的孔隙、岩溶—裂隙充水含水层结构,在平面上各含水层又具有各自的不规则空间分布、复杂的边界位置及边界条件。为了真实地反映华北型煤田客观存在的矿床水文地质特征,减少由于模型假设条件与实际相差太大而引起的计算误差,本文首次提出了“准三维”有限元数值模型,并用华北型煤田的典型实例成功地验证了这个模型。

From the sectional perspective , the coalfield of the North China is characteristic of multilayer porous and karst-fissure aquifers which are connected together hydraulically.From the plane view , every aquifer is characteristic of irregular spatial distribution and complicating boundary position as well as boundary conditions . Although the problems of preventing water break through under coalbed and of forecasting the water inflow in mine in the coalfield of the North China have been studied for over four decades , all models reported in the past literatures are limited to two-dimensional models in one aquifer for the problems . In order to reflect really sectional and plane mine - deposit - hydrogeological characteristics for the coalfield of the North China , and to reduce the calculative errors which are caused by the differences between model conditions and real conditions in the model , the paper is the first to present a para -three-dimensional finite-element model ,in which a typical application example is also presented to verify the proposed model successfully .This is , no doubt , of great important significance for solving the common problems met in developing the coalfield of the North China .The further development of the para-three-dimensional numberical model and field applications are going on , and will be reported in the future papers .