| 盾构隧道壁后注浆中“定时浆”试验研究 |
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| 引用本文： | 朱伟,陆凯君,邢慧堂,钱勇进,王璐,魏斌.盾构隧道壁后注浆中“定时浆”试验研究[J].隧道建设,2022,42(5):784-790. |
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| 作者姓名： | 朱伟 陆凯君 邢慧堂 钱勇进 王璐 魏斌 |
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| 作者单位： | （1. 河海大学环境学院， 江苏 南京 210098； 2. 河海大学 岩土力学与堤坝工程教育部重点实验室， 江苏
南京 210098； 3. 河海大学土木与交通学院， 江苏 南京 210098； 4. 济南轨道交通集团有限公司， 山东 济南 250101） |
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| 摘 要： | 我国盾构隧道广泛使用凝结时间较长的单液浆，但由于注入后不能及时凝结常常引发管片上浮、浆液流失等工程问题。针对这些问题提出“定时浆”的概念。通过在单液硬性浆中添加氯化铝溶液与水玻璃，基于浆液的胶结时间、流动度、28 d强度等指标研究了“定时浆”的配方。结果表明： 1）通过先加入氯化铝溶液再加入水玻璃的方法，可以实现浆液“定时”凝结； 2）在硬性浆中掺加0.50%~0.75%的氯化铝溶液、1.00%~1.25%的水玻璃，可以达到良好的定时效果； 3）通过简单的注浆设备改造可以形成“双液单注”的定时注浆工艺。
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| 关 键 词： | 盾构隧道 壁后注浆 浆液配方 氯化铝溶液 水玻璃 胶结时间 上浮 |
Experimental Study of "Time controlling
Cement Mortar" in Backfill Grouting of Shield
Tunnel |
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| ZHU Wei,LU Kaijun,XING Huitang,QIAN Yongjin,WANG Lu,WEI Bin.Experimental Study of "Time controlling
Cement Mortar" in Backfill Grouting of Shield
Tunnel[J].Tunnel Construction,2022,42(5):784-790. |
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| Authors: | ZHU Wei LU Kaijun XING Huitang QIAN Yongjin WANG Lu WEI Bin |
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| Affiliation: | (1. College of Environment, Hohai University, Nanjing
210098, Jiangsu, China; 2. Key Laboratory of Ministry of Education
for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098,
Jiangsu, China; 3. College of Civil and Transportation,
Hohai University, Nanjing 210098, Jiangsu, China; 4.
Jinan Rail Transit Group Co., Ltd., Jinan 250101, Shandong, China) |
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| Abstract: | Single component cement mortar with a long
cementing time is widely employed in the construction of shield tunnels in
China. Due to the long cementing time of this mortar after injection, various
engineering issues such as segment floating and cement mortar loss often occur
in practical applications. To overcome these issues, a concept of "time controlling cement mortar"
is proposed. By adding aluminum chloride solution and sodium silicate into
single component cement mortar, the formulation of "time controlling cement mortar" was studied based on the cementing time,
fluidity, and strength of 28 days. The results reveal the following: (1) The
approach of adding aluminum chloride solution first and then sodium silicate
can achieve cementing time control of cement mortar. (2) The addition of 0.50%~0.75% aluminum chloride solution and
1.00%~1.25% sodium silicate to cement mortar can achieve a good performance of
cementing time control. (3) By simply modifying grouting equipment, double component cement mortar including cement mortar and sodium silicate
can be pumped in one pipe. |
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| Keywords: | shield tunnel backfill grouting fluid formula aluminum chloride solution sodium silicate cementing time floating |
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