孔隙砂岩多次化学注浆试验研究
发布时间：2019-06-11 22:49
【摘要】：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。
[Abstract]:The typical pore sandstone in Ningdong area was selected and four grouting tests were carried out with chemical slurry tracer of different colors, and the relationship between the diffusion of slurry in pores, filling law and grouting times and permeability coefficient and porosity of injected strata was revealed. It is found that the filling situation of each chemical grouting slurry is obviously different, the first grouting slurry has more uniform filling in the whole rock sample, and the subsequent grouting slurry shows the phenomenon of accumulation and filling in some areas. With the increase of grouting times, the permeability coefficient of rock samples decreases, the pore filling rate increases, the permeability coefficient, the relationship between pore filling rate and grouting times can be fitted by power function and logarithmic function, respectively. After four times of grouting, the permeability coefficient of rock samples is reduced by 97%, which indicates that multiple grouting has a good effect on reducing seepage. According to the test results, the numerical calculation model is established, and the water inflow of grouting hole and wellbore under different grouting times and different excavation conditions is predicted, and compared with the actual water inflow of wellbore, it is found that the two data are in good agreement with each other, which shows that it is feasible to establish a numerical model to predict the water inflow according to the test results.
【作者单位】： 中国矿业大学深部岩土力学与地下工程国家重点实验室;
【基金】：国家重点基础研究发展计划(973)项目(No.2013CB036000) 江苏省研究生培养创新工程资助项目(No.CXLX12_0963) 中国矿业大学大学生创新创业基金资助项目
【分类号】：TU45
，
本文编号：2497519
[Abstract]:The typical pore sandstone in Ningdong area was selected and four grouting tests were carried out with chemical slurry tracer of different colors, and the relationship between the diffusion of slurry in pores, filling law and grouting times and permeability coefficient and porosity of injected strata was revealed. It is found that the filling situation of each chemical grouting slurry is obviously different, the first grouting slurry has more uniform filling in the whole rock sample, and the subsequent grouting slurry shows the phenomenon of accumulation and filling in some areas. With the increase of grouting times, the permeability coefficient of rock samples decreases, the pore filling rate increases, the permeability coefficient, the relationship between pore filling rate and grouting times can be fitted by power function and logarithmic function, respectively. After four times of grouting, the permeability coefficient of rock samples is reduced by 97%, which indicates that multiple grouting has a good effect on reducing seepage. According to the test results, the numerical calculation model is established, and the water inflow of grouting hole and wellbore under different grouting times and different excavation conditions is predicted, and compared with the actual water inflow of wellbore, it is found that the two data are in good agreement with each other, which shows that it is feasible to establish a numerical model to predict the water inflow according to the test results.
【作者单位】： 中国矿业大学深部岩土力学与地下工程国家重点实验室;
【基金】：国家重点基础研究发展计划(973)项目(No.2013CB036000) 江苏省研究生培养创新工程资助项目(No.CXLX12_0963) 中国矿业大学大学生创新创业基金资助项目
【分类号】：TU45
，
本文编号：2497519
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