絮凝-真空预压法加固吹填淤泥淤堵缓解机理、固结理论及试验研究

Since the flocculation-vacuum preloading method is developed relatively late, the clogging mechanism of dredged fill and the remission mechanism of clogging in the consolidation process of flocculation-vacuum preloading have not been well learned. The methods for consolidation calculation and optimization design are not well developed, and as a result brought much inconvenience in the application of flocculation-vacuum preloading method. This project conducted systematic experimental and theoretical researches which are focusing on the field of the clogging effect of dredged fill, the remission mechanism of clogging in flocculation-vacuum preloading method and the theory for drainage consolidation based on clogging effect. These researches will analyze the microcosmic and macroscopic properties of dredged fill, the interaction pattern of filter and mud, and the law for the formation of soil cylinder and as a result reveal the clogging mechanism of dredged fill; screen out the optimal kind and amount of flocculating agent and define the law of flocculation; obtain the anti-clogging mechanism of improved dredged fill; present the consolidation theory, which take the clogging effect into consideration, basing on non-uniformity under vacuum and the effect of filter clogging on drainage boundary, and then be used to the field of consolidation analysis after flocculation improvement; research and development the technology of flocculation-vacuum preloading, which would then be evaluated and improved by model tests and field measurements, and further amend the above-mentioned consolidation theory. This research is of important theoretical value and is practical for engineering construction.

由于絮凝-真空预压工艺起步晚，对吹填淤泥的淤堵机理和絮凝-真空预压固结过程淤堵缓解机制认识不清，缺乏相应的固结计算以及优化设计方法，给实际工程应用带来了巨大挑战。因此，本项目围绕高含水量吹填淤泥的淤堵效应、絮凝真空预压淤堵缓解机制和基于淤堵效应的排水固结理论展开系统的试验及理论研究。分析吹填淤泥的微宏观特性、滤膜与淤泥相互作用模式、土柱形成规律，从而揭示吹填淤泥的淤堵机理；筛选最优絮凝剂种类和投加量，明确絮凝调质机理，获得絮凝-真空预压淤堵缓解机制；综合考虑真空固结非均匀性以及滤膜淤堵对排水边界的影响建立基于淤堵效应的固结理论，进而应用于絮凝改性后的淤泥固结分析；研发絮凝-真空预压工艺，通过模型试验与现场实测对该工艺的加固效果进行综合评价与优化设计，并实现对上述考虑淤堵效应的固结理论的进一步修正。本项目不仅具有重要的理论价值，还具有重大的工程意义。

由于絮凝-真空预压工艺起步晚，对吹填淤泥的淤堵机理和絮凝-真空预压固结过程淤堵缓解机制认识不清，缺乏相应的固结计算以及优化设计方法，给实际工程应用带来了巨大挑战。因此，本项目围绕高含水量吹填淤泥的淤堵效应、絮凝真空预压淤堵缓解机制和基于淤堵效应的排水固结理论展开系统的试验及理论研究。分析吹填淤泥的微宏观特性、滤膜与淤泥相互作用模式、土柱形成规律，从而揭示吹填淤泥的淤堵机理；筛选最优絮凝剂种类和投加量，明确絮凝调质机理，获得絮凝-真空预压淤堵缓解机制；综合考虑真空固结非均匀性以及滤膜淤堵对排水边界的影响建立基于淤堵效应的固结理论，进而应用于絮凝改性后的淤泥固结分析；研发絮凝-真空预压工艺，通过模型试验与现场实测对该工艺的加固效果进行综合评价与优化设计，并实现对上述考虑淤堵效应的固结理论的进一步修正。本项目不仅具有重要的理论价值，还具有重大的工程意义。