A state-of-art review on development and progress of backfill grouting materials for shield tunneling
Xi Jiang (The Hong Kong Polytechnic University)
Hehua Zhu (Tongji University)
Zhiguo Yan (Tongji University)
Fengshou Zhang (Tongji University)
Fei Ye (Chang'an University)
Peinan Li (Donghua University)
Xuehui Zhang (Geo-engineering)
Zhiren Dai (China Railway First Survey & Design Institute Group Co., Ltd.)
Yun Bai (Tongji University)
Baoshan Huang (The University of Tennessee Knoxville)
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Abstract
Backfill grouting plays a vital role in shield tunneling. This paper aims to present a comprehensive review of the development and progress of backfill grouting materials specifically designed for shield tunneling. Initially, the various components of grouts, such as pozzolanic materials, filling fine aggregates, and chemical additives, are introduced and discussed in detail. Subsequently, this study investigates critical properties including workability, mechanical properties, and durability of the grouts. Additionally, the principal factors influencing the properties are summarized, along with recommended ranges for specific geological conditions. Furthermore, the paper elucidates the diffusion mechanism of grouting mortars by presenting the current grouting models employed in shield tunneling. Recent advancements in grouting materials are extensively studied and extended, offering new perspectives for future grouting technology in shield tunneling. This study provides valuable insights into overcoming the existing challenges associated with shield tunnel grouting and promoting the evolution of current grouting materials.
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