利用不同泡沫浓度和不同掺入比,对天津城区不同含水率粉细砂土进行改良试验研究,通过室内物理力学试验参数对比分析,并结合地铁二号线某区间盾构施工实际工程,得出含水率在16%~26%之间粉砂,添加泡沫浓度为1%,掺入比为20%~30%较为适宜土压平衡盾构机掘进。 Using different foam concentration and different incorporation ratio, the improvement tests on the fine sandy soil with different water content in Tianjin urban area were carried out. Based on the comparative analysis of the indoor physical and mechanical test parameters and the actual project of Shield construction in a certain section of Metro Line 2, The moisture content is between 16% and 26% of silt, adding foam concentration of 1%, mixing ratio of 20% to 30% is more suitable for earth pressure balance shield tunneling.