The exponential growth of tunnelling projects worldwide necessitates efficient management of excavated soil, particularly from Earth Pressure Balance Tunnel Boring Machines (EPB-TBMs). This study investigates the temporal evolution of mechanical properties in EPB-excavated soil, focusing on the conditioning process’s impact. Through a comprehensive literature review, gaps in understanding the soil’s transition from a liquid-like state back to its solid form are identified. Existing studies touch on mechanical property changes over time but lack detailed temporal analyses. Our research addresses this gap by examining the recovery of soil compactability over time, crucial for its reuse. By conducting modified Proctor tests at different time intervals post-conditioning, we elucidate the relationship between soil properties and conditioning parameters. Our findings reveal a direct correlation between recovery time and total water content, influenced by added water and foam injection ratio. We demonstrate that different conditioning parameter combinations yield similar immediate properties but divergent recovery times, which are crucial for logistical planning and environmental suitability. This study offers valuable insights into optimizing EPB-TBM excavation logistics, enhancing soil reuse efficiency, and advancing sustainability in civil engineering projects.

中文翻译：

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土压平衡隧道开挖土再利用：一种通过改进的 Proctor 试验进行 logistic constraints 估计的方法


全球隧道掘进项目的指数级增长需要对开挖的土壤进行有效管理，特别是土压平衡隧道掘进机 （EPB-TBM）。本研究调查了土压平衡开挖土中力学性能的时间演变，重点关注调节过程的影响。通过全面的文献综述，确定了在理解土壤从液体状状态过渡到固体形式方面的差距。现有研究涉及机械性能随时间的变化，但缺乏详细的时间分析。我们的研究通过检查土壤压实性随时间的恢复来解决这一差距，这对土壤的再利用至关重要。通过在调节后的不同时间间隔进行改良的 Proctor 测试，我们阐明了土壤特性和调节参数之间的关系。我们的研究结果揭示了恢复时间和总含水量之间的直接相关性，受添加水和泡沫注入率的影响。我们证明，不同的调节参数组合产生相似的即时属性，但恢复时间不同，这对于物流规划和环境适宜性至关重要。本研究为优化土压平衡式隧道掘进机开挖物流、提高土壤再利用效率和推进土木工程项目的可持续性提供了宝贵的见解。