秦鹏飞,王文菁.基于渗滤效应的砂土注浆扩散机理分析[J].中国水利水电科学研究院学报,2024,22(6):623-631 |
基于渗滤效应的砂土注浆扩散机理分析 |
Analysis of sand grouting diffusion mechanism based on infiltration effect |
投稿时间:2024-03-27 |
DOI:10.13244/j.cnki.jiwhr.20240051 |
中文关键词: 渗流力学 砂土注浆 渗滤效应 数值模拟 加固机理 |
英文关键词:seepage mechanics sand grouting percolation effect numerical simulation strengthening mechanism |
基金项目:河南省高等学校重点科研项目(24A560011);黄河科技学院博士科研启动基金(02032695);河南省水利厅科技攻关项目(2023GG45);重庆交通大学水利水运工程教育部重点实验室开放基金(SLK2023B07) |
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中文摘要: |
渗滤效应下水泥颗粒在砂土孔隙通道上滞留沉积,严重影响扩散远端的注浆改良效果。基于两相流理论对渗滤效应的动力学过程进行了分析,并考虑质量守恒和渗流性连续条件建立了浆液扩散的微分控制方程,然后进行了平面一维渗流问题的数值模拟计算。结果表明渗滤效应对砂土孔隙率,浆液压力、流速及浓度存在显著影响,数值计算结果与Darcy定律相比,最大差值达40%左右。揭示了渗滤效应的根本特征及其对砂土注浆加固效果的影响机制,指出渗滤作用下扩散至远端的浆液水泥含量少,不能产生理想的加固效果。所得结论对砂土注浆工程设计、施工具有较高的参考价值,对多孔介质渗流力学的发展也具有一定指导意义。 |
英文摘要: |
The retention and deposition of cement particles on the sand pore channel under the percolation effect seriously affects the grouting improvement at the far end of the diffusion.Based on the two-phase flow theory,the dynamic process of percolation effect is analyzed,and the differential control equation of slurry diffusion is established considering the mass conservation and continuity of seepage.Then the numerical simulation of one-dimensional planar seepage problem is carried out.The results show that the percolation effect has a significant impact on the porosity,slurry pressure,flow velocity and concentration of sand.The maximum difference between the numerical calculation results and Darcy’s law is about 40%.The basic characteristics of percolation effect and its influence mechanism on sand grouting reinforcement effect are revealed,and it is pointed out that the cement content of grout diffused to the far end under percolation effect is small,which cannot produce ideal reinforcement effect.The conclusions can be used as reference for the design and construction of sand grouting works,and also have certain guiding significance for the development of porous media seepage mechanics. |
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