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选取宁东地区典型的孔隙砂岩,采用不同颜色示踪的化学浆液进行4次注浆试验;揭示了浆液在孔隙中的扩散、充填规律及注浆次数与被注岩层渗透系数、孔隙率之间的关系。研究发现:每次化学注浆浆液的充填情况有明显的差别,首次注浆浆液在整个岩样均有较均匀的充填,后续的各次注浆浆液均呈现部分区域积聚充填的现象;随着注浆次数的增加岩样的渗透系数减小,孔隙充填率增加,渗透系数、孔隙充填率与注浆次数的关系可分别采用幂函数及对数函数拟合;4次注浆后岩样的渗透系数减小了97%,说明多次注浆起到了很好的减渗效果。依据试验成果,建立数值计算模型,预测了不同注浆次数、不同开挖条件下注浆孔及井筒的涌水量,并与井筒实际涌水量进行对比,发现两者数据较为吻合,说明依据试验结果建立数值模型进行涌水量预测是可行的。
The typical pore sandstone in Ningdong area was selected and four grouting tests were carried out using chemical slurry traced by different colors. The diffusion and filling rules of grout in the pores and the relationship between the number of grouting and the permeability coefficient and porosity of the injected formation were revealed Relationship. The results show that there are obvious differences in the filling conditions of each chemical grouting slurry. The first grouting slurry is uniformly filled in the whole rock sample, and the subsequent grouting slurry shows the accumulation and filling in some regions. With the increase of The increase of grouting frequency can decrease the permeability coefficient of rock sample, increase the filling rate of pore, and the relationship between permeability coefficient, pore filling rate and grouting frequency can be fitted by power function and logarithm function respectively. The permeability coefficient decreased 97%, indicating that multiple grouting played a good effect of reducing the infiltration. Based on the experimental results, a numerical model was established to predict the gushing borehole and wellbore gushing under different conditions of grouting, and compared with the actual gushing volume of wellbore. The results show that the two are in good agreement with each other, It is feasible to establish numerical model for prediction of water inflow.