弱胶结孔隙介质渗透注浆模型试验研究

为了研究弱胶结孔隙介质化学注浆浆液充填及减渗的基本规律，采取模型试验的方法，研究了不同有效粒径及细度模数的模型材料注浆前、后渗透系数、孔隙率及抗压强度变化规律，试验过程中控制了注浆泵流量、浆液性能、静水压力等参数，共完成6个模型。试验结果表明：各模型材料注浆充填率在9%～41%之间，随着模型材料粒度及渗透系数的减小，注浆充填率呈逐渐增大的趋势；注浆前、后模型材料的渗透系数随着有效粒径及细度模数的减小而逐渐减小，且减小的比例逐渐增加；注浆大幅地减小了材料的渗透性，各模型渗透系数减小幅度在84%～97%之间；注浆前各模型材料的抗压强度较低且较为接近，注浆后各模型材料的强度增加量在6～10倍之间，且强度增量表现为随着模型有效粒径及细粒模数的减小而逐渐增大的特点。

Experiment study of penetration grouting model for weakly cemented porous media

In order to study the basic law of chemical slurry filled and reduced infiltration for weakly cemented porous media, the method of model experiment is taken to research on the permeability coefficient, porosity and compressive strength before and after grouting with different effective diameters and fineness modulus model material. The parameters of injection pump flow, slurry performance and hydrostatic pressure are controlled in the experiment, and six models are completed in all.The results show that: the grouting filling rate is between 9%-41% of each model material; and the rate gradually increases with the decrease of particle size and permeability coefficient. Permeability coefficient before and after grouting shows gradually decreasing trend with the decrease of effective diameter and fineness modulus, and the proportion of reduce increase gradually. The permeability coefficient of the model decreases significantly with the range of 84%-97% after grouting. Before grouting, the compressive strength of the model is low and close, after grouting, the compressive strength increments between 6-10 times, and the strength increments show gradually increasing trend with the decrease of effective diameter and fineness modulus.