隧道二衬拱顶脱空现象常引发衬砌失效破坏,进而对行车安全产生严重威胁。现有注浆材料无法充分适应带模注浆施工特点,限制了带模注浆应用效果,不利于其进一步推广。针对传统注浆材料高泌水、低结实率以及与二衬混凝土结合性较差等情况,开展了带模注浆微膨胀材料试验研究。以注浆工程中常用的配比为基础,探究在不同硫铝酸盐水泥(SAC)和普通硅酸盐水泥(OPC)之比和不同水胶比下,砂浆的最佳力学性能。在此基础上,调整各种外加剂的用量,使注浆材料具有良好的工作性能,同时研究引气剂掺量对力学性能和抗冻性能的影响规律。试验结果表明,当OPC∶SAC为91∶9和水胶比为0.30时,砂浆的早期强度和后期强度发展良好;当减水剂和增稠剂分别为胶凝材料的0.4%和0.34%时,材料具有较好的工作性能;并在具有良好抗冻性能的同时,其力学性能也没有过大削弱。最后将所研制注浆材料应用于带模注浆工程,验证其适用性和有效性。
Abstract
Hollows in the secondary lining vault often leads to the failure of tunnel lining, posing a serious threat to driving safety. Current grouting materials fail to adequately adapt to the characteristics of mold grouting construction, thereby limiting the effectiveness and the further promotion of this technique. This study aims to address the limitations of traditional grouting materials, such as high water leakage, low solid setting rate, and poor bonding with the secondary lining concrete. To this end, micro-expansion materials were tested and investigated for use in mold grouting construction. On the basis of commonly used ratios in grouting engineering, the optimal mechanical properties of mortar were explored by varying the ratios of sulphoaluminate cement (SAC) and ordinary Portland cement (OPC) and water-binder ratios. The dosage of admixtures was then adjusted to improve working performance, and the influence of air-entraining agent dosage on mechanical properties and frost resistance was studied. Experimental results indicate that an OPC∶SAC ratio of 91∶9 and a water-binder ratio of 0.30 enable the best early and late strength development of mortar. Meanwhile, the optimal dosages of water reducing and thickening agents are found to be 0.4% and 0.34% of cementitious material, respectively, to achieve desirable working performance. In addition, the resulting grouting material exhibits good frost resistance, as well as maintained mechanical properties. Finally, the developed grouting material was applied to a mold grouting project, where its applicability and effectiveness were verified.
关键词
二衬注浆 /
和易性 /
微膨胀 /
配合比 /
减水剂 /
抗冻性
Key words
secondary lining grouting /
workability /
micro-expansion /
mix proportion /
water-reducing agent /
frost resistance
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基金
河北省交通运输厅科技项目(YC-201905)
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