Drilling Technology of Pre-Grouting Reinforcement with Directional Borehole in Coal Floor

The Calculation of Grouting Diffusion Radius on Based Bingham Fluid for Chunnel That Passes through Fractured Rock Mass

“…The sudden water gushing or instability of surrouding rock of the chunnel will bring about the irreparable consequences. So the construction of those poor geographic sections usually adopt reinforcement in advance to the surrounding rock, but because of the difficulty of making sure the slurry diffusion range during the process of pro-grouting at the present, the complex geological situation when grouting, the difficulty of selecting the calculation of parameters and etc, we can't get reasonable calculation result and further lead to the uncertainty of some grouting programs [1] . This article will calculate the grouting diffusion radius in terms of the poor geological sections with the background of pro-grouting program of Jiaozhou Bay of Qingdao.…”