磷酸-水玻璃浆液砂层渗透注浆模拟试验研究
郑选荣1陈箐芮2尚太昊1陆宏朝3李军锋3侯建林3
Simulation Experiment on Phosphoric Acid–Sodium Silicate Permeation Grouting in Sandy Layer
ZHENG XuanrongCHEN QingruiSHANG TaihaoLU HongchaoLI JunfengHOU Jianlin
-
作者信息:1.西安科技大学建筑与土木工程学院， 710054， 西安
2.西安科技大学高新学院， 710109， 西安
3.中铁北京工程局集团有限公司， 230088， 合肥
-
Affiliation:College of Architecture and Civil Engineering, Xi’an University of Science and Technology, 710054, Xi’an, China
-
关键词:
-
Key words:
-
DOI:10.16037/j.1007-869x.2023.12.037
-
中图分类号/CLCN:TU472.5
-
栏目/Col:研究报告
摘要:
目的：为探究磷酸质量分数对水玻璃注浆材料性能的影响，以降低砂土渗流与固结周围土层，特进行本研究。方法：通过室内试验，对不同磷酸掺量的水玻璃浆液性质进行测定；自制一套渗流系数测定与模拟注浆一体化试验平台，探究不同配比注浆材料对砂层抗渗性能改良的效果。结果及结论：当注浆材料的pH值在3~5时，注浆材料凝结时间可控制在30 s至70 min内，凝结时间较碱性浆液更易调控，利于工程应用；随着磷酸含量的增加，注浆材料呈酸性时凝胶收缩现象越缓慢，而浆液呈碱性时凝胶收缩现象越快，且注浆材料呈碱性时脱水收缩情况较酸性时更为剧烈；当注浆材料呈酸性时，固砂体抗渗性能主要衰减时间随浆液pH值降低而提前，12 d后较为稳定；当注浆材料呈碱性时，固砂体1~3 d时的抗渗性能较稳定，3 d后固砂体抗渗性能衰减，且随着注浆材料pH值降低而愈发迅速。
Abstracts:
Objective: To investigate the influence of phosphoric acid mass fraction on the properties of sodium silicate grouting materials, with the goal of reducing sandy layer permeability and consolidating surrounding soil, the research is specifically carried out. Method: Through laboratory tests, the properties of sodium silicate slurry with different phosphoric acid concentrations are measured. A set of integrated experimental platforms for permeability coefficient measurement and simulated grouting are developed to explore the effects of different grouting material ratios on the improvement of sandy layer antipermeability performance. Result & Conclusion: When the pH value of the grouting material is between 3 and 5, the setting time can be controlled within 30 seconds to 70 minutes, which is easier to control than alkaline slurry, making it advantageous for engineering applications. As the phosphoric acid content increases, the gel shrinkage of the grouting material becomes slower in acidic conditions and faster in alkaline conditions. Moreover, when the grouting material is acidic, the decay time of the antipermeability performance of the consolidated sand body advances as the slurry pH decreases and stabilizes after 12 days. In contrast, when the grouting material is alkaline, the antipermeability performance of the consolidated sand body remains relatively stable for 1 to 3 days, with a decline in performance occurring after 3 days. Additionally, this decline becomes more rapid with decreasing pH values of the grouting material.
- 上一篇: 高铁物流运输模式及其可行性
- 下一篇: 市域轨道交通姓什么
过刊浏览
资料下载
友情链接