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不受污染的战略。利用胶体硅（CS）基化学浆液进行环境围堵已成为地下水保护的重要步骤。CS凝胶也被用于岩土工程应用和二次采油过程中的提高采收率作业。虽然在这一重要领域已经做出了一些努力，但在了解这些胶凝溶液通过多孔介质的流动和输送过程方面，还没有任何一致的努力。因此，迫切需要一个研究项目，通过实验和数值研究来发展我们对化学灌浆过程的理解，以努力推进我们对遏制技术发展的认识。研究的主要目的是通过数值和实验研究来了解非均质多孔介质化学灌浆过程的发生机理。在资助期间，拟进行的数值和实验研究将集中在密度、流动和输送的数学耦合、凝胶团的过滤和非均质性的影响。

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.