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考虑巷道开挖扰动和注浆压力衰减对浆液渗透扩散规律的影响,基于拟连续介质假设,利用渗流力学理论推得围岩扰动应力和注浆压力耦合作用下的浆液非稳态渗透扩散基本方程;并运用多场耦合软件COMSOL建立了锚注浆液在围岩中渗透扩散的数值计算模型,系统研究了注浆时间、注浆压力以及注浆锚杆间距等锚注参数对浆液渗透扩散的影响。其结果表明:延长注浆时间可以减缓浆液压头在渗透扩散过程中的衰减而增大浆液在围岩中的扩散半径;注浆锚杆间距与浆液扩散半径之比小于等于1.41时,浆液将在巷道全断面围岩内形成完整注浆加固圈。最后将以上研究成果用于淮北袁店一矿新掘巷道的锚注加固设计中,经现场监测证明其有效地控制了巷道围岩的变形与破坏。
Considering the influence of roadway excavation disturbance and grouting pressure attenuation on the infiltration and diffusion of slurry, based on the assumption of quasi-continuum medium, the basic equations of unsteady infiltration and diffusion of surrounding rock under perturbation stress of surrounding rock and coupling of grouting pressure ; And the multi-field coupling software COMSOL was used to establish a numerical model for the infiltration and diffusion of the anchor grouting fluid in the surrounding rock. The effects of grouting time, grouting pressure and the grouting anchor spacing on the diffusion and diffusion of grouts influences. The results show that: prolonging the grouting time can reduce the attenuation of slurry head in the process of infiltration and diffusion and increase the diffusion radius of grout in the surrounding rock; when the ratio of grouting bolt spacing and grout diffusion radius is less than or equal to 1.41, Complete tunnel grouting around the tunnel to form a complete grouting reinforcement ring. Finally, the above research results are used in the design of the bolting and grouting reinforcement of the new digging tunnel of Yuandian mine in Huaibei. The on-site monitoring proves that it effectively controls the deformation and damage of the surrounding rock of the roadway.