【摘要】 针对顶管施工中触变泥浆配比多依赖经验，缺少结合工程地层条件对泥浆配比与性能关联性机理进行分析的问题，依托南京市某穿越淤泥质黏土层的顶管工程，建立了泥浆性能评价指标体系，通过配比试验确定了Na₂CO₃最优掺量，采用灰色相似绝对关联度模型分析了膨润土、羧甲基纤维素（CMC）与泥浆性能指标的关联度。试验结果表明：以膨润土为基准的Na₂CO₃最优掺量使泥浆流变性达到最佳，Na₂CO₃最优掺量仅与膨润土中蒙脱石含量有关，触变性作为测定Na₂CO₃最优掺量的指标最为合理；膨润土与泥浆的触变性和失水量的关联度更高，CMC作为增黏剂，与马氏漏斗黏度的关联度更大，膨润土和CMC对动切力的影响程度相当。更多还原

【Abstract】 The mix ratio of thixotropic slurry in pipe jacking is mostly determined based on experience, and engineering geological conditions are hardly considered in the mechanism analysis of the correlation between slurry composition and properties. To address these issues, a pipe jacking project traversing silty clay layers in Nanjing was studied, and a slurry performance evaluation index system was established. The optimum Na₂CO₃ dosage was determined through mix ratio testing, and a grey similarity absolute correlation model was employed to analyze the correlation between bentonite, carboxymethyl cellulose（CMC）, and slurry performance indexes. The results indicate that the optimal Na₂CO₃ dosage（relative to bentonite） maximizes the rheological properties of the slurry, and this percentage depends solely on the montmorillonite content in bentonite. Thixotropy serves as the most reasonable index for determining this percentage. Bentonite exhibits stronger correlations with thixotropy and fluid loss of slurry, while CMC, as a tackifier, shows a higher correlation with Marsh funnel viscosity. Both components have comparable effects on the dynamic shear force.更多还原