摘要
海水具有较强的腐蚀性,极容易通过围岩薄弱区域侵蚀破坏隧道衬砌结构,为保证支护结构的耐久性,文章以普通硅酸盐水泥为基材,通过调节减水剂、速凝剂和高分子聚合物的掺量来设计耐腐蚀注浆材料的配合比,并对不同配合比注浆材料进行了耐腐蚀指标测试和现场注浆效果检验。室内试验结果表明,该注浆材料试块(水灰比为0.65~1.0)在海水浸泡360 d的强度腐蚀系数大于0.80,体积稳定性良好;为加快侵蚀速度,将试块浸泡在饱和MgSO;溶液中,注浆材料试块(水灰比为0.65)浸泡360 d的强度腐蚀系数大于0.80,体积稳定性仍良好。通过现场注浆试验对结石体强度进行测试,测试结果表明,在饱和MgSO4溶液中浸泡180 d的浆液结石体的点荷载强度均值为0.931 kN,比未浸泡试块的强度均值0.984 kN减少了5.5%,进一步验证了注浆材料的耐腐蚀性能。
Seawater is highly corrosive, and it is very easy to cause erosion and destruction of tunnel lining structure through the weak area of surrounding rocks. In order to ensure the durability of the supporting structure, the mix proportion of corrosion-resistant grouting materials with ordinary Portland cement as the base material is designed by means of adjusting the content of water reducer, accelerator and high molecular polymer, and the corrosion-resistant index test and field grouting effect test are carried out on grouting materials with different mix proportions. The indoor test results show that the strength corrosion coefficient of the grouting material sample(water-cement ratio:0.65~1.0) after 360 d soaking in seawater is greater than 0.80, with good volume stability. In order to accelerate the erosion rate, the test sample is soaked in saturated MgSO4 solution, and the strength corrosion coefficient of the grouting material sample(water-cement ratio: 0.65) after 360 d soaking is greater than 0.80, and still with good volume stability. The strength of set grouts is tested through field grouting test. The test results show that the average point load strength of set grouts after 180 d soaking in saturated MgSO4 solution is 0.931 kN, which is 5.5% lower than the average strength 0.984 kN of non-soaked samples, further verifying the corrosion resistance of grouting materials.
作者
焦雷
JIAO Lei(Urban Rail Transit Engineering Company Limited of China Railway 15th Bureau,Luoyang 471002)
出处
《现代隧道技术》
CSCD
北大核心
2022年第1期256-262,共7页
Modern Tunnelling Technology
关键词
海底隧道
注浆材料
耐腐蚀性
强度腐蚀系数
体积稳定性
Subsea tunnel
Grouting materials
Corrosion resistance
Strength corrosion coefficient
Volume stability
