Super-large diameter slurry shield tunnel encountering boulder formation: Detection, treatment and data analysis

IF 4.9 2区 工程技术 Q1 ENGINEERING, CIVIL Transportation Geotechnics Pub Date : 2024-10-18 DOI:10.1016/j.trgeo.2024.101408
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Abstract

Boulders pose substantial challenges in coastal urban tunnel engineering. This study, for the first time, utilizes extensive closely spaced borehole data from 3486 drilling points obtained during actual tunnelling through boulder strata to evaluate the effectiveness of microtremor detection, analyze variations in operational parameters, and assess the efficiency of blasting treatment. Additionally, leveraging borehole data, a 3D reconstruction of the soil-boulder-bedrock stratum was developed, and the stratum content ratio at the excavation face was derived. A multivariate linear regression model was established to explore the relationship between boulder geology and construction parameters. The results demonstrated that microtremor surveys effectively identified boulder distributions by analyzing horizontal-to-vertical spectral ratio curves and differences in surface wave phase velocity. Field drilling confirmed the high accuracy of microtremor predictions, particularly in areas with dense or thick boulder layers. Post-blasting secondary drilling revealed boulder fragments smaller than 30 cm, meeting the operational requirements for shield cutter and crusher systems. The presence of boulders was found to increase thrust, torque, and overturning moments, as well as cause abnormal cutter wear. Blasting significantly reduced the standard deviation of operational data, demonstrating its effectiveness in stabilizing tunnelling performance. Regression analysis showed a strong correlation between geological conditions and tunnelling parameters, with results indicating that blasting operations effectively mitigate the adverse impacts of boulders on shield tunnelling performance. This study aims to provide valuable insights and references for future engineering projects encountering similar complex geological conditions.
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超大直径泥浆盾构隧道遭遇巨石层:检测、处理和数据分析
巨石给沿海城市隧道工程带来了巨大挑战。本研究首次利用实际隧道穿越巨石地层过程中获得的 3486 个钻孔点的大量密间距钻孔数据,评估了微震探测的有效性,分析了操作参数的变化,并评估了爆破处理的效率。此外,利用钻孔数据,开发了土壤-巨石-岩石地层的三维重建,并得出了开挖面的地层含量比。建立了多元线性回归模型,以探讨巨石地质与施工参数之间的关系。结果表明,通过分析水平-垂直频谱比曲线和表面波相位速度差异,微震波勘测可有效识别巨石分布。实地钻探证实了微震波预测的高准确性,尤其是在巨石层密集或厚的区域。爆破后的二次钻探发现了小于 30 厘米的巨石碎片,符合盾构刀盘和破碎机系统的操作要求。研究发现,巨石的存在会增加推力、扭矩和倾覆力矩,并导致刀盘异常磨损。爆破大大降低了运行数据的标准偏差,证明了其在稳定隧道性能方面的有效性。回归分析表明,地质条件与隧道参数之间具有很强的相关性,结果表明爆破作业可有效减轻巨石对盾构隧道性能的不利影响。本研究旨在为今后遇到类似复杂地质条件的工程项目提供有价值的见解和参考。
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来源期刊
Transportation Geotechnics
Transportation Geotechnics Social Sciences-Transportation
CiteScore
8.10
自引率
11.30%
发文量
194
审稿时长
51 days
期刊介绍: Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.
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