水泥基注浆材料是煤矿防渗与加固工程中最为常用的注浆材料，其配置而成的水泥单液浆属于悬浊液。对于煤矿裂隙注浆而言，悬浊液自身特性影响着注浆扩散过程，并导致扩散后浆液浓度沿扩散路径上的分布存在一定差异，影响注浆治理效果。为研究裂隙注浆中浆液沿扩散路径上的浓度分布规律，基于自主研发的裂隙注浆模拟试验平台开展了注浆扩散模拟试验，以浆液完全析水沉降后的固相体积占总体积的比例作为浆液在裂隙内浓度的表征，获得了不同裂隙开度与水灰比条件下浆液沿扩散路径上的浓度分布特征。基于非牛顿流体力学理论，探讨了浆液沿扩散路径上的浓度分布形成机制。研究结果表明:各水灰比浆液在裂隙扩散运移后的浆液浓度随着浆液扩散距离的增加而降低，并呈现出流动稀化趋势，靠近注浆孔位置浆液浓度高，浆液扩散运移锋面处浆液浓度最低;相同裂隙开度条件下，低水灰比浆液沿扩散路径上的浓度大于高水灰比浆液沿扩散路径上的浓度;裂隙开度越大，浆液在裂隙扩散后的浆液浓度越高;浆液在裂隙流动扩散中显现的沉降渗滤特性导致了浆液在裂隙扩散后的浓度分布差异。结合上述研究结果，对于裂隙注浆工程而言，可先注入水灰比较高的浆液以保证浆液扩散距离达到设计值，然后，注入水灰比较低的浆液以提升整个浆液扩散区的浓度，保证注浆效果。

Cement-based material is the most commonly used grouting material for anti-seepage and reinforcement in coal mines,which is a kind of suspension. For the fracture grouting in coal mines,the characteristics of the suspension affect the diffusion process of slurry and lead to a certain difference in the concentration distribution of slurry along the diffusion path. It severely affects the effect of grouting treatment. In order to investigate the concentration distribution of slurry in fracture grouting,a series of grouting laboratory test was carried out based on the self-developed grouting test platform. The ratio of the solid volume to the total volume of slurry after complete settlement was used as the characterization of the slurry concentration in fracture,and the concentration distribution characteristics along the diffusion path of slurry under different fracture apertures and the water-cement ratio were obtained. Based on the theory of non-Newtonian fluid mechanics,the formation mechanism of concentration distribution along the diffusion path of slurry was discussed. The results show that the concentration of each water-cement ratio slurry after grouting decreases with the increase of the diffusion distance,and shows a trend of flow thinning. The higher the slurry concentration near the grouting hole,the lower the slurry concentration at the slurry flow front. Under the condition of same fracture aperture,the concentration of slurry with low water-cement ratio along the diffusion path is greater than that of slurry with high water-cement ratio. The larger the fracture aperture is,the higher the slurry concentration is after grouting. The sedimentation and filtration characteristics of slurry during penetration result in the difference of concentration distribution of slurry after grouting. Combined with the above results,for the fracture grouting engineering,the slurry with relatively higher water cement ratio could be injected first to ensure that the slurry diffusion distance reaches the design value.Then the slurry with relatively lower water cement ratio is injected to increase the concentration of the entire slurry diffusion zone,thereby ensuring grouting effect.