GMS在深井开挖地层的涌水量预测

Prediction of Water Inflow from GMS in Deep Well Excavation

新城金矿主井开挖深度为1521m,竖井施工要经过裂隙发育地带,开挖涌水成为深井开挖施工的重点。为预测该深井开挖地层的涌水量,基于地下水模拟分析软件GMS,结合深井区域的钻孔信息、水文地质条件和抽水试验测得的模拟参数,在-326.40^-728.1m深度范围建立5个连续solid地层模型,对solid模型进行三维网格划分,以modflow模块模拟5个地层区域的水头分布情况,进行深井开挖区域的涌水量预测;根据GMS模拟的涌水量数据,参照实际开挖过程中施工方测得的实际涌水量数值,对模拟的准确性进行验证;针对模拟结果分析周围地层的水头分布情况,提出了对于裂隙带水头较大的地层进行超前注浆止水的施工方案,减少裂隙带地层的涌水量,确保施工作业环境的安全。

The excavation depth of the main well of Xincheng Gold Mine is 1 521 m.The construction of the shaft should pass through the fissure development zone.The excavation of water is the focus of deep well excavation construction.Based on the groundwater simulation analysis software GMS,combined with the drilling information,hydrogeological conditions and pumping test parameters measured in the deep well area,five continuous solid formation models are established in the depth range of-326.40 m to-728.1 m,and the solid model is three-dimensional.Meshing,using the modflow module to simulate the head distribution of the five strata areas,and predicting the water inflow in the deep well excavation area;according to the GMS simulated water inflow data,refer to the actual influx quantity measured by the constructor during the actual excavation process.The accuracy of the simulation is verified.According to the simulation results,the distribution of the heads in the surrounding strata is analyzed.The construction scheme of advanced grouting and water stop for the stratum with large heads in the fracture zone is proposed to reduce the water inflow in the fracture zone and ensure the construction.The safety of the work environment.