Experimental and numerical studies on chemical grouting into heterogeneous porous media

随着对地下水供应需求的增加，迫切需要制定保护宝贵的地下水资源免受污染的战略。利用胶体二氧化硅(CS)化学灌浆进行环境保护已成为地下水保护的重要步骤。壳聚糖凝胶还被用于岩土工程应用和石油二次开采期间的强化采油作业。虽然在这一重要领域已经作出了一些努力，但还没有任何协调一致的努力来了解与这些凝胶溶液在多孔介质中流动和运输有关的过程。因此，迫切需要一个研究计划，通过实验和数值研究来加深我们对化学灌浆过程的理解，从而努力促进我们对遏制技术的发展的认识。本研究的主要目的是通过数值和实验研究来了解化学灌浆进入非均质多孔介质过程中的机理。拟议的数值和实验研究将集中在密度、流动和传输的数学耦合、凝胶斑点的过滤和非均质性的影响上。

With the increasing need for groundwater supplies, there is an urgent need for devising strategies for protecting the precious groundwater resources from contamination. Environmental containment through the use of colloidal silica (CS) based chemical grout is becoming an important step in groundwater protection. CS gels have also been used for geotechnical applications and enhanced oil recovery operations during secondary recovery of petroleum. While there have been some efforts in this vital area, there has not been any concerted effort to understand the processes related to flow and transport of these gelling solutions through porous media. Hence there is an urgent need for a research program to develop our understanding of the processes occurring during chemical grouting through both experimental and numerical investigations in an effort to advance our knowledge towards development of containment technology. The major objective of the research is to understand the mechanisms occurring during chemical grouting into heterogeneous porous media through numerical and experimental studies. The proposed numerical and experimental studies will focus on the effects of density, mathematical coupling of flow and transport, filtration of gel blobs and heterogeneity during the grant period.