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| Column penetration grouting mechanism for power-law fluids considering tortuosity effect of porous media |
| YANG Zhiquan1，LU Jie1，WANG Yuan1，ZHANG Zhiwei1，YANG Yi1，ZHU Yingyan1，2，ZHANG Jie3，GUO Yongfa4，CHEN Xingui5 |
(1. Faculty of Public Safety and Emergency Management，Kunming University of Science and Technology，Kunming，Yunnan 650093，China；2. Institute of Mountain Hazards and Environment，Chinese Academy of Sciences，Chengdu，Sichuan 610041，China； 3. Yunnan Institute of Geological Environment Monitoring，Kunming，Yunnan 650216，China；4. Kunming Survey，Design
and Research Institute Co.，Ltd. of CREEC，Kunming，Yunnan 650200，China；5. The Third Engineering Co.，
Ltd. of China Railway Seventh Bureau Group Corporation，Xi'an，Shaanxi 710000，China) |
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Abstract The tortuosity effect of porous media has an important influence on penetration diffusion and grouting effect. A seepage equation of power-law fluid considering tortuosity effect of porous media was established，and the column penetration grouting mechanism was analyzed. Based on computer programming technologies，a three-dimensional numerical simulation program for column penetration grouting of power-law fluid considering tortuosity effect of porous media was developed by using secondary development with COMSOL multiphysics platform and Darcy¢s law，and numerical simulation of penetration grouting process of power-law cement grouts with different water-cement-ratios into gravel soils was carried out. Finally，comparisons among theoretical analysis，model experiments and numerical simulations were performed. Research results show that theoretical calculation values and numerical simulation values of the diffusion radius considering the tortuosity effect of porous media are closer to the model experiment values than those without considering the tortuosity effect，indicating that the developed equation better reflects column penetration grouting diffusion laws of power-law fluid into porous media. Research achievements can provide theoretical support and technical guidance for design and construction of practical grouting engineering in porous media stratums.
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2021, Vol. 40 
