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A new clay-cement composite grouting material for tunnelling in underwater karst area

新型的水下岩溶注浆黏土水泥复合材料

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Abstract

A new clay-cement composite grouting material (CCGM) for tunnelling in underwater karst area was developed through the excellent synergistic interactions among cement, clay, meta-aluminate and lignin. The probable formation mechanism of the material was proposed based on a series of experimental tests. The results show that with an optimal mass ratio (2:1:1:0.024) for water, cement, clay and additives, the obtained CCGM displayed an excellent grouting performance for karst in an underwater condition. Compared with neat cement grouts and clay-cement grouts, CCGM has faster gel time, lower bleeding rate and bulk shrinkage rate, greater initial viscosity, and a strong resistance to water dispersion. A successful engineering application indicates that CCGM not only fulfils a better grouting performance for karst in underwater conditions but also reduces the engineering cost and environmental pollution.

摘要

本研究利用水泥、黏土、偏铝酸盐及木质素之间良好的协同作用, 研制了一种新型水泥复合灌 浆材料(CCGM)用于富水岩溶盾构隧道注浆工程, 并通过系列室内实验提出了新型水泥复合灌浆材料 的形成机理。研究结果表明, 在水、水泥、黏土和添加剂的最佳配比(2: 1: 1: 0.024)下, 所制得的 CCGM 注浆性能最优; 与纯水泥浆和黏土水泥浆相比, CCGM 具有较短的凝胶时间、较小的流动度 和体积收缩率、较大的初始黏度以及较强的抗水分散性。工程应用表明, 该注浆材料在富水岩溶环境 下注浆性能优越, 并且可以降低工程造价和减小环境污染。

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Correspondence to Jin-yang Fu  (傅金阳).

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Project(51608539) supported by the National Natural Science Foundation of China; Projects(2016M592451, 2017T100610) supported by the China Postdoctoral Science Foundation

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Zhang, C., Yang, Js., Fu, Jy. et al. A new clay-cement composite grouting material for tunnelling in underwater karst area. J. Cent. South Univ. 26, 1863–1873 (2019). https://doi.org/10.1007/s11771-019-4140-5

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  • DOI: https://doi.org/10.1007/s11771-019-4140-5

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