某竖井施工涌水量预测分析

Forecast and Analysis of Water Inflow in a Vertical Well

井筒涌水量具突发性和破坏性及突泥涌出等特点.针对井筒涌水的特点,以某矿山井筒施工为例,根据地质钻孔资料,分别采用GMS软件与"大井法"对井筒施工涌水进行预测计算.首先,对某竖井水文地质资料进行分析,建立井筒涌水概念模型,将竖井井筒概化为三层非均质各向同性的地下水流模型.其次,根据抽水实验确定井筒含水层参数,其中,第一层渗透性系数为0.089 9 m/d,第二层渗透性系数为0.154 9 m/d,第三层为隔水层.在此基础上,运用地下水数值模拟软件,对竖井涌水量进行预测,预测涌水量为383 56 m^3/d.采用"大井法"对井筒涌水量进行预测,其涌水量为4 127.9 m^3/d.根据预测结果,对井筒涌水量预测的影响因素进行分析,提出软件对井筒涌水量进行预测精度的途径.

Wellbore gushing is characterized by suddenness, destructiveness and mud outburst. According to the characteristics of wellbore gushing, this paper, taking a mine wellbore as an example, uses the GMS software and “big well method” to predict and calculate wellbore construction gushing on the basis of the geological drilling data. Firstly, the hydrogeological data of a shaft are analyzed to establish a conceptual model of wellbore gushing, and the wellbore is generalized into a three-layered heterogeneous, isotropic groundwater flow model. Secondly, according to the pumping experiment to determine the wellbore aquifer parameters, the calculation value of the first layer permeability coefficient is 0.089 9 m/d, the calculation value of the second layer permeability coefficient is 0.154 9 m/d, and the third layer is aquifuge layer. On this basis, using the groundwater numerical simulation software, the vertical well water inflow is predicted and the inflow of water was predicted to be 38 356 m 3/d.The “big well method” was used to predict wellbore water inflow, and the water inflow is 4 127.9 m 3/d. According to the prediction results, the influencing factors of wellbore gushing prediction are analyzed, and the way to predict the precision of wellbore gushing by software is put forward.