Volume 2 · Issue 4 (2025)
Research and Application of Construction Technology for Ultra-Deep SMW Tri-axial Cement Soil Mixing Piles in Hard Stratum
Shanshan Xu, Jian Li, Zhonglei Xia, Zhi Yang, Tianhang Yu
Haiwei Engineering Construction Co., Ltd. of FHEC of CCCC, Xuxinzhuang, Songzhuang Town, Tongzhou District, Beijing 101119, China
Abstract: The ultra-deep SMW method using tri-axial cement mixing piles often encounters issues such as low drilling efficiency, increased drill bit wear, and excessive cement slurry consumption when working in hard sand and clay layers. These problems can lead to unstable pile quality, project delays, and cost increases. To address these challenges, this study systematically investigated key factors, including the compatibility of construction machinery, improvements to the drill bit structure, a segmented construction sequence, dynamic adjustment of cement slurry mix ratios, and optimization of grouting process parameters. The results indicate that using high-strength alloy drill bits and a pre-drilling technique can reduce the wear rate of drilling tools. A stratified adjustment strategy for the cement-to-water ratio based on formation response can reduce cement consumption by 55%. Combining a skip drilling sequence significantly improves pile uniformity and pile quality. The research findings significantly enhance the construction efficiency and economic viability of ultra-deep tri-axial mixing piles in hard strata, providing a reusable technical approach for similar projects.
Keywords: Ultra-Deep Tri-Axial Cement Soil Mixing Piles; Soil Mixing Wall Hard; Stratum; Support of Excavation
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