Grouting is the most commonly used methods in dealing with water inrush issue in mine and tunnel engineering. In order to better predict the grouting effect, research on slurry diffusion mechanism became a hotspot for scholars. At present, the mainstream theoretical model used to study the slurry diffusion mechanism are the circle diffusion model and the modified ones in plane plate fracture. However, these models cannot explain the “contradiction” between the rapid setting characteristics of quick-setting slurry and the continuous long-term injection of slurry in grouting engineering, which cannot accurately predict the grouting pressure or grouting diffusion range. Therefore, a “circle-outburst diffusion model” which can explain the above “contradiction” was proposed in this paper. Based on the new model, stepwise algorithms were developed to predict the grouting pressure and slurry diffusion range. By means of conducting fracture grouting simulation test and collecting grouting pressure data in an actual grouting project, the new model was verified and the slurry diffusion mechanism was studied. Comparison results indicate that the new model can reveal the intrinsic reason for the irregular diffusion phenomenon of the slurry and forecast the outburst moment accurately. The circle diffusion stage and outburst diffusion stage elaborated in the new “circle-outburst diffusion model” were consistent with the staged characteristics of the grouting process presented in the grouting simulating test. Differences between theoretical and experimental pressure value were within 10 %, indicating a high degree of consistency. The number and distribution of outburst diffusion points determine slurry diffusion form and significantly influence the diffusion range. The grouting pressure and the length of slurry flow path increase nonlinearly with time in each diffusion stage. It is hoped that the new model can provide a theoretical basis for the study of diffusion mechanism of quick-setting slurry.

中文翻译：

---

基于循环-突出扩散模型的富水裂隙岩体中速凝泥浆扩散机制


注浆是矿山和隧道工程中处理突水问题最常用的方法。为了更好地预测注浆效果，浆液扩散机理的研究成为学者们的热点。目前，研究浆体扩散机理的主流理论模型是圆扩散模型和平面板断裂的修正模型。但这些模型无法解释注浆工程中速凝浆体的快速凝结特性与连续长期注入浆体之间的“矛盾”，无法准确预测注浆压力或注浆扩散范围。因此，本文提出了可以解释上述“矛盾”的“循环-爆发扩散模型”。基于新模型，开发了逐步算法来预测注浆压力和泥浆扩散范围。通过在实际注浆工程中进行裂缝注浆模拟试验并采集注浆压力数据，对新模型进行了验证，并研究了浆液扩散机理。对比结果表明，新模型能够揭示泥浆不规则扩散现象的内在原因，准确预测突出时刻。新的“圆形-突出扩散模型”中阐述的圆形扩散阶段和突出扩散阶段与注浆模拟试验中呈现的注浆过程的阶段性特征一致。理论压力值与实验压力值的差异在10%以内，一致性程度较高。突出扩散点的数量和分布决定了浆体扩散形式并显着影响扩散范围。 在每个扩散阶段，注浆压力和浆液流路长度随时间非线性增加。希望新模型能够为速凝浆料扩散机理的研究提供理论基础。