暗挖地铁车站施工中靶向注浆技术的影响因素及效果控制
查丽娟
Influencing Factors and Control Effects of Targeted Grouting Technology for Underground-excavated Metro Station Construction
ZHA Lijuan
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作者信息:河南建筑职业技术学院工程管理系, 450001, 郑州
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Affiliation:Department of Engineering Management, Henan Technical College of Construction, 450001, Zhengzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.01.029
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中图分类号/CLCN:TU94+3
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栏目/Col:研究报告
摘要:
［目的］常规注浆施工技术中浆液无效扩散较为严重，对岩土体的加固效果不理想。对此，需研究靶向注浆技术在地铁车站及隧道预注浆施工中的应用。［方法］阐述了靶向注浆技术的加固机理，基于双液浆的流变方程，并结合均匀毛管组理论，分析靶向注浆技术的影响因素，推导得到双液浆柱形渗透扩散时扩散半径及浆液压力计算式。将推导得到的理论计算式应用于某地铁车站的预注浆工程施工中，以验证预注浆施工的效果。［结果及结论］靶向注浆技术将压密注浆技术和渗透注浆技术相结合，在保证注浆效果的同时能节约材料的用量并保护周边环境。参数分析显示：浆液扩散半径值受地下水压、浆液流速、双液浆黏性参数A和黏性参数B的显著影响，在所假定的参数变化范围内，浆液扩散半径的变化规律得到了较好的体现。现场监测数据表明，整个预注浆施工过程中未造成地表抬升和环境污染，注浆加固效果可达到安全开挖要求，达到了预期的效果。
Abstracts:
［Objective］ In conventional grouting construction technology, the ineffective diffusion of grout is comparatively severe and leads to unsatisfactory reinforcement effects on surrounding rock and soil mass. Therefore, it is essential to investigate the application of targeted grouting technology in metro station and tunnel pre-grouting construction. ［Method］ The reinforcement mechanism of targeted grouting technology is expounded. Based on the rheological equation of dual-fluid grout and the theory of uniform capillary groups, the influencing factors of targeted grouting technology are analyzed, and the calculation formulas for the diffusion radius and grout pressure during the cylindrical permeation diffusion of dual-fluid grout are derived. These theoretical formulas are applied to the pre-grouting construction of a metro station to verify the effectiveness. ［Result & Conclusion］ Targeted grouting technology combines pressure grouting and permeation grouting, ensuring grouting effectiveness while saving material and protecting the surrounding environment. Parameter analysis indicates that the grout diffusion radius is significantly affected by groundwater pressure, grout flow speed, the viscosity parameters A and B of the dual-fluid grout. Within the assumed parameter change ranges, the variation law of the grout diffusion radius is well reflected. The field-monitored data shows that the entire pre-grouting construction process does not cause land uplift or environmental pollution, the grouting reinforcement effect meets the safety excavation requirements, and the expected results are achieved.
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