考虑渗滤效应的水泥浆锋面扩散理论及试验研究

发布时间：2018-01-31 17:56

本文关键词： 渗滤效应水泥浆锋面流速压力　出处：《中国科学:技术科学》2017年11期 　论文类型：期刊论文

【摘要】：基于渗流连续性方程、Darcy渗流定律、质量守恒方程、线性滤过定律及压力降方程,建立了水泥浆锋面扩散理论模型,分析了渗滤效应下水泥颗粒的运移滤出机制和浆液锋面的扩散规律;应用自主研发的模型试验系统,研究了水泥浆锋面压力的动态变化规律,并与理论值进行了对比分析.结果表明,在渗滤效应作用下,沉积层渗透系数沿浆液扩散距离增大;锋面速度变化率与沉积层渗透系数呈负相关;特定扩散距离处,锋面压力降p'呈先增后减,而锋面压力p及平均单位压力降ΔP'呈先减后增趋势;锋面压力理论值与试验值偏差率仅为.10%~26%,两者吻合度较高.研究结论可指导注浆设计,对实际工程具有一定的应用价值.
[Abstract]:Based on the seepage continuity equation Darcy's seepage law, mass conservation equation, linear filtration law and pressure drop equation, the theoretical model of cement slurry front diffusion is established. The migration and filtration mechanism of cement particles and the diffusion law of slurry front under percolation effect are analyzed. The dynamic variation law of cement slurry frontal pressure is studied by using the model test system developed by ourselves and compared with the theoretical value. The results show that under the action of percolation effect. The permeability coefficient of sediment layer increases along the diffusion distance of slurry. There is a negative correlation between the velocity change rate and the permeability coefficient of sedimentary layer. At the specific diffusion distance, the front pressure drop p 'increased first and then decreased, while the front pressure p and the average unit pressure drop 螖 P' decreased first and then increased. The deviation rate between the theoretical value of frontal pressure and the experimental value is only .10 / 26, and the agreement between the two is relatively high. The conclusion of the study can guide the design of grouting and has certain application value to practical engineering.
【作者单位】：山东大学岩土与结构工程研究中心;山东科技大学土木工程与建筑学院;
【基金】：国家重点基础研究发展计划(编号:2013CB036001) 国家重点研发计划(编号:2016YFC0801604)资助项目
【分类号】：TQ172.1
【正文快照】： 1引言随着我国经济的飞速发展,大规模水利水电、公路铁路、深井矿山及城市轨道交通工程相继投入建设,由于工程面临的地质条件日趋复杂,以致突水、涌沙、塌方等灾害时有发生,造成了严重的人员伤亡和经济损失[1~3].其中,城市轨道交通建设中频繁遭遇第四系富水沙土层,在地下水渗

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