| 摘要: |
| 分别开展了水泥浆在重力和压力作用下的析水试验，研究了不同水灰比（mW/mC）条件下水泥浆的析水过程，获得了水泥浆析水对浆液密度和黏度等物理力学性能的影响规律，分析了重力和压力作用下试验结果存在差异的原因；同时结合土体线性压缩劈裂注浆扩散公式，分析了析水作用对注浆扩散范围的影响.结果表明：水泥浆极易发生析水，且析水率高，析水速率快，当mW/mC≥15时，析水率达40%以上，造成水泥浆密度和黏度值显著提高；当mW/mC≥10时，水泥浆密度值提高10%以上，黏度增大3倍以上；若不考虑水泥浆析水特性，会显著低估其扩散阻力，导致注浆扩散范围计算结果偏大、注浆压力计算结果偏小. |
| 关键词: 水泥浆 析水 浆液黏度 注浆扩散 |
| DOI：103969/j.issn.1007 9629201801002 |
| 分类号: |
| 基金项目:“十三五”国家重点研发计划项目（2016YFC0801604） |
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| Research on Water Bleeding Property of Cement Slurry |
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LI Xianghui, ZHANG Qingsong, ZHANG Xiao, ZUO Jinxin, LAN Xiongdong, YANG Teng
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School of Civil Engineering, Shandong University, Jinan 250061, China
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| Abstract: |
| A series of tests was carried out to measure the water bleeding process under the action of gravity and pressure. The influence rules of the water bleeding property on the density and viscosity of slurries with different cement water ratio(mW/mC) were studied, and the reason of differences between the test results under the action of gravity and pressure was analyzed. At last, the influence on the grouting radius of the water bleeding property was studied with consideration of the split grouting equation in the soil with the linear relationship of stress and strain. The results indicate that the cement slurry is easy to bleeding, the ratio of bleeding is quite high, and the velocity of bleeding is high. When mW/mC≥15, the bleeding ratio of cement slurry is more than 40%. The density and viscosity value can be greatly increased with increasing water bleed, the density can be increased by more than 10%, and the viscosity can increase more than 3 times, when mW/mC≥10. With considering the water bleeding property, the grouting resistance can be significantly underestimated, as a result, the calculation results of grouting diffusion are relatively large, and the results of grouting pressure are relatively small. |
| Key words: cement slurry water bleeding slurry viscosity grouting diffusion |
