堤坝劈裂灌浆浆液的固结效应

针对堤坝劈裂灌浆防渗加固中浆液固结机理,结合实际劈裂灌浆施工过程,采用了有限差分数值计算方法开展数值模拟,基于应变硬化-渗流耦合模型,探讨了浆液渗流固结的变化规律,分析了浆液在灌浆、停灌和复灌不同阶段的孔隙水压力、坝体应力水平增量等变化特征,得到了浆液在不同阶段的扩散形态和应力水平增量沿不同路径的分布特征,揭示了堤坝劈裂灌浆浆液在土体内渗流固结机理.计算结果表明:堤坝劈裂灌浆过程中浆液以灌浆轴线为中心线,向坝体四周扩散,对称分布;随着灌浆次数的增加,浆液在坝体内渗透所产生的孔隙水压力也逐渐增大,浆液扩散区域也逐渐增大,从而更为有效地填充坝体内所存在的病害体,改善坝体内应力状态,提高坝体防渗效果.

Consolidation effect of splitting grouting on earth dam

To investigate the consolidation mechanism of splitting grouting for earth dam,the advanced FLAC3D method based on 3-D explicit finite difference method was used to analyze the stability of a certain dam during splitting grouting according to strain hardening model and fluid-solid-coupled theory.The distribution regularities of pore pressure and stress level in dam were analyzed in three stages of grouting,non-grouting and re-grouting.The diffusion shape of pore pressure and features of stress level along different path were investigated to discover the consolidation mechanism of splitting grouting and to evaluate the dam stability.The results indicate that the slurry of splitting grouting is diffused to arround field with grouting axial line as middle line,and forms symmetrical distribution.With the increase of grouting times,the pore pressure in dam deduced by slurry penetrating is increased with enhanced diffusion field.The splitting grouting can effectively solve the internal problems in dam,which improves the stress and increases the impermeable effectiveness.