预防隧道排水系统结晶病害的喷射混凝土配合比优化试验研究

来源期刊:中南大学学报(自然科学版)2021年第5期

论文作者:叶飞 王坚 田崇明 何彪 赵猛 王庆龙 韩鑫

文章页码:1634 - 1644

关键词:隧道工程;排水系统;结晶堵塞;喷射混凝土

Key words:tunnel engineering; drainage system; crystallization plugging; shotcrete

摘    要:通过室内模型试验模拟隧道排水管结晶堵塞的全过程,采用L16(45)正交试验和极差分析方法研究喷射混凝土基本配合比、粉煤灰掺量、硅灰掺量、速凝剂掺量和减水剂掺量5个因素对混凝土渗流结晶的影响,并通过渗流水中Ca2+含量来评价其渗流结晶的程度。研究结果表明:在建隧道排水管中结晶沉淀的主要成分为CaCO3,CaCO3中钙的主要来源是喷射混凝土;影响混凝土渗流结晶的主次因素依次为混凝土基本配合比、粉煤灰掺量、硅灰掺量、减水剂掺量、速凝剂掺量。喷射混凝土的最优设计配合比为:水泥质量浓度为456 kg/m3,水胶比为0.43,胶骨比为0.28,砂率为0.53,粉煤灰掺量为20%,硅灰掺量为15%,速凝剂掺量为10%,减水剂掺量1.6%,采用最优配合比的试验组相较于采用实际施工配合比的参照组钙离子流失量降低了约67%。

Abstract: The whole process of crystallization clogging of the tunnel drainpipe was simulated through the indoor model test method. The influences of the basic mix ratio of shotcrete, fly ash content, silica fume content, accelerator content and superplasticizer content on concrete seepage and crystallization were studied using the L16(45) orthogonal test method and range analysis method. The degree of seepage crystallization of shotcrete was evaluated by the Ca2+ content in seepage water. The results show that the main component of crystal precipitation in the drainpipe of the building tunnel is CaCO3, and the calcium in CaCO3 mainly comes from shotcrete. The order of factors affecting the infiltration crystallization is the basic mixing ratio of shotcrete, fly ash content, silica fume content, superplasticizer content, and accelerator content. The optimal design mix ratio of shotcrete is: mass concentration of concrete 456 kg/m3, water-binder ratio 0.43, rubber-bone ratio 0.28, sand rate 0.53, fly ash content 20%, silica fume content 15%, accelerator content 10% and superplasticizer content 1.6%. Compared with that of the reference group using the actual construction ratio, the calcium ion loss of the experimental group with the optimal mix ratio decreases by about 67%.

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