盾构隧道渣土资源化再利用技术研究及展望

Research and Prospect on Technology for Resource Recycling of Shield Tunnel Spoil

为形成对盾构渣土资源化再利用技术进展、挑战与创新的系统认识,介绍了国内外盾构隧道渣土的分类再利用标准,详细总结了盾构渣土作为盾构施工辅助材料、再生建筑材料、植被复垦材料与工程填筑材料的再利用技术。阐明分析了盾构渣土资源化再利用技术在标准、方法、设备、市场效益等方面仍存在细化、优化、规模化、产业化的挑战,构建了"再利用方式初判—盾构渣土分级处理—渣土再利用可行性评价—再生产品性能与市场效益评估"的盾构渣土资源化再利用的标准化技术流程。重点阐述了盾构渣土在壁后注浆材料、植被复垦基质和免烧建筑材料等方面的再利用新技术,提出了盾构渣土在壁后注浆材料中的分级再利用标准、渣土再生产品性能优化的多目标规划技术、盾构渣土作为植被复垦基质的再利用可行性试验方法、盾构渣土制备免烧空心砖的工艺流程与参数优化等新思路。最后,对我国盾构渣土资源化再利用技术与产业发展趋势进行了展望。

The technological progress, challenges, and innovations on recycling of shield tunnel spoil are presented. First,the classification standards on recycling both in China and abroad are introduced. Four types of recycling technologies for shield tunnel spoil, i.e., shield construction auxiliary materials, recycled building materials, vegetation reclamation materials, and engineering refilling materials, are then elaborated. The challenges in refinement, optimization, scale, and industrialization in terms of standards, methods, equipment, and market benefits of reuse technology are clarified and analyzed. The standardized technical process for resource recycling of shield tunnel spoil is established from preliminary assessment, graded treatment, feasibility evaluation of spoil recycling to performance and market benefit assessment. In addition, the paper highlights the new technologies of shield tunnel spoil reuse as synchronous grouting materials,vegetation reclamation medium, and non-fired building materials. The classification standard for shield tunnel spoil recycling as synchronous grouting materials, multi-objective programming of recycled product performance optimization,the feasibility test method of shield tunnel spoil reuse as vegetation reclamation medium, and the process and parameter optimization for non-fired hollow bricks are proposed. Finally, the technologies and industrial development trend of resource recycling technology for shield tunnel spoil in China are discussed.