盾构泡沫系统优化改造及现场试验研究

Improvement of the Shield Foam System and Relevant Field Tests

在地铁隧道施工中,泡沫系统是影响土压平衡盾构掘进安全、质量和效率的重要因素。文章以杭州地铁一号线盾构隧道工程为依托,针对盾构自带泡沫系统自身不易控制、维修不便、系统复杂且不独立等缺陷,提出了优化改造措施,意在使泡沫系统完全国产化和独立化;通过改造前后泡沫系统操作性、精度控制、系统故障率及经济效益四方面的比较,证明了优化改造后泡沫系统的优异性能;同时,基于优化改造后的泡沫系统,针对杭州粉砂性土的地层条件下进行的盾构推进时泡沫系统施工参数的现场试验,分析了不同泡沫量对刀盘扭矩、推进速度的影响,结果表明泡沫参数适用于粉砂性土层中的盾构掘进。

The foam system is a key factor affecting the safety, quality, and efficiency of EPBS during metro tunnelling. Using the shield tunnelling on Hangzhou Metro Line 1 as an example, and in light of the existing problems of the foam system-such as control difficulties, inconvenient maintenance, and complicated and dependent systems-relevant improvements are proposed in this paper aimed at achieving complete control and independence of the system. Excellent performance of the improved foam system were verified by comparing its operability, control precision, failure rate, and economic benefits before and after the improvement. Meanwhile, based on the improved foam system and a field test of its construction parameters during shield tunnelling in a silty soil stratum in Hangzhou, the influence of the foam output on cutter torque and advancing speed was analyzed, showing that the improved foam parameters are appropriate for tunnelling in a silty soil stratum.