Abstract The experimental investigation reported herein aims toward the development of groutability prediction models based on the hydraulic conductivity of sand and other parameters affecting the groutability of cement suspensions. For the purposes of the present study, suspensions of three different cement types, each at four different gradations, having water to cement (W/C) ratios of 1, 2 and 3, by weight, were injected into dry and dense sand columns with a height of 36.5 cm. The tested cements cover the range from ordinary to microfine materials having nominal maximum grain sizes of 100, 40, 20 and 10 μm. Six uniform, clean sands with different grain sizes were used alone or mixed in various proportions to obtain 48 additional sands, with different gradations, for grouting. Suspension groutability is improved by increasing cement fineness and suspension W/C ratio or by decreasing apparent viscosity and is controlled by the hydraulic conductivity and the gradation of the sand. The groutability and filtration limits defined in the present study, are based on sand hydraulic conductivity and suspension apparent viscosity and depend on cement fineness and sand gradation. The best model developed by performing Binary Logistic Regression analyses of the injection test results is regarded as an efficient tool for the prediction of groutability of cement suspensions in sands with different gradations, as it exhibits a coefficient of multiple determination equal to 0.914 and estimates successfully the outcome of the injection tests available from this study and collected from other studies at a rate equal to 89% and 70.5%, respectively.

中文翻译：

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基于砂水传导率的水泥悬浮液可灌性预测

摘要 本文报告的实验研究旨在开发基于砂的水力传导率和其他影响水泥悬浮液可灌性的参数的可灌性预测模型。出于本研究的目的，将三种不同水泥类型的悬浮液注入干燥致密的砂柱中，每种类型具有四种不同的级配，水灰比（W/C）按重量计为 1、2 和 3。高度为 36.5 厘米。测试的水泥涵盖从普通材料到超细材料的范围，其标称最大粒度为 100、40、20 和 10 微米。将六种不同粒度的均匀、洁净的砂单独使用或以不同比例混合，获得48种不同级配的砂进行注浆。通过增加水泥细度和悬浮液水灰比或降低表观粘度来改善悬浮可注浆性，并受水力传导率和砂的级配控制。本研究中定义的可灌浆性和过滤极限基于砂子的水力传导率和悬浮液表观粘度，并取决于水泥细度和砂子级配。通过对注入试验结果进行二元 Logistic 回归分析而开发的最佳模型被认为是预测不同级配砂中水泥悬浮液可灌浆性的有效工具，因为它的多重确定系数等于 0.914 并成功地估计了从这项研究中获得的注射测试结果，并从其他研究中收集的比率等于 89% 和 70.5%，