(1. 中南大學 資源與安全工程學院，長沙 410083；
2. 廣西翔路建設有限責任公司，南寧 530029)
摘 要: 漿液擴散與壓力變化情況是衡量注漿效果的重要參數(shù)，在傳統(tǒng)的漿液擴散壓力的研究中往往沒有考慮被注介質孔隙通道的曲折效應，這造成計算得出的注漿壓力值與實際值有明顯的偏差。為此，根據(jù)分形理論推導出孔隙通道的曲折效應方程，并通過冪律流體本構方程導出考慮孔隙曲折效應的漿液擴散模型。分析孔隙曲折效應對擴散壓力的影響，同時討論了漿液黏度、流變指數(shù)以及單位注漿量對注漿壓力衰減的影響規(guī)律。結果表明：若不考慮曲折效應，注漿壓力隨擴散距離的增大呈現(xiàn)緩慢衰減的變化趨勢，若采用本研究中所推導的模型，其注漿壓力隨擴散距離的增大呈現(xiàn)急劇下降趨勢；若考慮曲折效應，流變指數(shù)在特定的范圍內，其壓力損耗隨流變指數(shù)的增大呈現(xiàn)首先急劇下降，之后變化幅度很小。
關鍵字: 曲折效應；分形理論；注漿壓力；擴散規(guī)律
（1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
2. Guangxi Xianglu Construction Co.LTD., Nanning 530029, China）
Abstract:The pore channel of porous media is tortuous in practice, however, the tortuosity of the pore channel of the injected medium is ignored in the traditional method, which results in obvious bias between the calculated value and the actual value of grouting pressure. The tortuosity equation of the pore channel was derived according to the fractal theory. A slurry diffusion model considering the effect of tortuosity of the pore channel was derived based on the above equation and the constitutive equation of the power law fluid. The effect of pore tortuosity on diffusion pressure were analyzed with the new model. And the change laws of slurry viscosity, rheological index and the unit volume of grouting on the attenuation of grouting pressure were also discussed. The results shows that without taking pore tortuosity into account, the grouting pressure presents the trend of slow attenuation with the increase of the diffusion distance. However, by using the deduced model considering the pore tortuosity, the grouting pressure presents the trend of sharp downward with the increase of the diffusion distance. And the pressure loss decreases rapidly with the increase of the rheological index in a certain range, and then the change range is very small.
Key words: pore tortuosity; fractal theory; grouting pressure; diffusion law
