深部岩溶多分支钻孔注浆水平间距设计研究

Horizontal spacing design of multi-branch borehole grouting in deep karst

深部岩溶水害地面区域治理工程中,多分支近水平钻孔水平间距设计是决定治理工程是否高效的关键。以两淮煤田潘二矿为研究对象,采用数值模拟模拟浆液扩散,数值模拟表明浆液扩散半径与地层渗透率、注浆压力、水灰比呈正相关,与地层孔隙度呈负相关,并对数值模拟结果进行回归分析得到浆液扩散半径经验公式,采用示踪试验方法对浆液扩散半径经验公式进行修正。

In the ground area treatment project of deep karst water disaster,the horizontal spacing design of multi-branch near-horizontal boreholes is the key to determine whether the treatment project is efficient.Taking Pan II Mine in Lianghuai Coalfield as the research object,the slurry diffusion was simulated by numerical simulation.The numerical simulation showed that the slurry diffusion radius was positively correlated with the formation permeability,grouting pressure,water-cement ratio,and negatively correlated with the formation porosity.The empirical formula of the slurry diffusion radius was obtained by regression analysis of the numerical simulation results,and the empirical formula of the slurry diffusion radius was modified by the tracer test method.