| 纤维硅灰水泥石强度与浆液抗冲刷特性 |
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| 引用本文： | 李小飞,孙江涛,陈卫忠,袁敬强,刘金泉,张庆艳.纤维硅灰水泥石强度与浆液抗冲刷特性[J].岩土力学,2018,39(9):3157-3163. |
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| 作者姓名： | 李小飞 孙江涛 陈卫忠 袁敬强 刘金泉 张庆艳 |
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| 作者单位： | 1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，湖北 武汉 430071；2. 中交铁道设计研究总院有限公司，北京 100088； 3. 广东省长大公路工程有限公司，广东 广州 510620；4. 山东大学 岩土与结构工程研究中心，山东 济南 250061 |
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| 基金项目： | 国家重点基础研究发展计划项目（973计划）（No. 2013CB036006, No. 2015CB057906）；国家自然科学基金项目（No. 51509246）。 |
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| 摘 要： | 针对隧道突水灾害防治对注浆材料的特殊要求，在水泥浆中加入外掺剂改善其力学特性与抗冲刷特性。通过测试不同水灰比、纤维掺量、硅灰掺量下水泥石的抗压与抗折强度，得出各水灰比下的强度最佳配合比，并测试最佳配合比下浆液的流动性与抗冲刷特性。试验发现，纤维与硅灰的掺入能够显著提高水泥石的强度，且对浆液的流动度影响不大；低流速下纤维硅灰水泥浆的抗冲刷特性较纯水泥浆改善显著，但流速较高时其抗冲刷特性仍较差。基于此，在纤维硅灰水泥浆中再掺入可再分散性乳胶粉进一步改善浆液抗冲刷特性。试验结果表明，可再分散性乳胶粉能明显改善浆液抗冲刷特性，即使在较高流速（0.6 m/s）下，其浆液留存率仍达到60%以上。研究结果为隧道突水灾害防治与动水注浆浆液选择提供了参考。
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| 关 键 词： | 隧道工程 动水注浆 抗分散性 突水治理 浆液留存率 |
| 收稿时间： | 2016-12-06 |
Strength and anti-washout property of fiber silica fume cement grout |
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| LI Xiao-fei,SUN Jiang-tao,CHEN Wei-zhong,YUAN Jing-qiang,LIU Jin-quan,ZHANG Qing-yan.Strength and anti-washout property of fiber silica fume cement grout[J].Rock and Soil Mechanics,2018,39(9):3157-3163. |
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| Authors: | LI Xiao-fei SUN Jiang-tao CHEN Wei-zhong YUAN Jing-qiang LIU Jin-quan ZHANG Qing-yan |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. CCCC Railway Consultants Group Co., Ltd., Beijing 100088, China; 3.Guangdong Provincial Changda Highway Engineering Co., Ltd., Guangzhou, Guangdong 510620, China; 4. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, Shandong 250061, China |
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| Abstract: | Aiming at the special requirements of the grouting material for the prevention of water inrush hazards in tunnels, the mechanical properties and anti-washout properties of the grout were improved by adding the admixture. The optimum mixing ratio of water to cement was obtained by testing the compressive strength and flexural strength of cement stone under different water to cement ratios, fiber contents and silica fume contents. The anti-washout characteristics and fluidity of the grout under the optimum mixing ratio were tested. It was found that the incorporation of fiber and silica fume with cement could significantly improve the strength of cement stone and had little effect on the fluidity of grout. At the same time, the anti-washout performance of the fiber silica fume cement grout under the low flow velocity was better than that of the pure cement grout, but the anti-washout performance of the fiber silica fume cement grout was still poor when the flow velocity became high. The results showed that the redispersible emulsion powder could significantly improve the anti-washout properties of the grout. Even at high flow velocity (0.6 m/s), the grout retention rate was still more than 60%. The results provide a reference for the prevention and treatment of water inrush hazards in tunnel and the choice of grouting. |
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| Keywords: | tunnel engineering dynamic water grouting anti-washout property treatment of water inrush grout retention ratio |
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