定向注浆不同注浆压力下浆液扩散特性研究

Study on Slurry Diffusion Characteristics of Directional Grouting Under Different Grouting Pressures

为研究定向注浆不同注浆压力下的浆液扩散特征,以黄河北煤田开采受顶底板灰岩水威胁为背景,通过采用理论分析、试验模拟和工程分析等方法,获得了不同注浆压力下平行分支孔浆液时空扩散特性。结果表明:定向分支钻孔的最佳注浆时间为40 min,最佳注浆压力为11 MPa,为受岩溶承压水威胁的黄河北煤田及其类似矿井的科学安全开采提供了参考。

In order to study the slurry diffusion characteristics of directional grouting under different grouting pressures,based on the background that the mining of the north coalfield of the Yellow River is threatened by limestone water in the roof and floor, through the methods of theoretical analysis, experimental simulation and engineering analysis, the temporal and spatial diffusion characteristics of parallel branch holes under different grouting pressures were obtained.The results show that the optimum grouting time of directional branch drilling is 40 min and the optimum grouting pressure is 11 MPa, which provides a reference for the scientific and safe mining of the north coalfield of the Yellow River and its similar mines threatened by karst confined water.