中文摘要：

针对南昌地区粘土矿物含量较高的泥质粉砂岩地层,文章依托南昌地铁1号线盾构工程,对泥质粉砂岩碴土进行了改良试验,对比分析了室内碴土试验和现场碴土试验结果,提出了FIR值的修正系数。研究结果表明：采用泡沫剂对泥质粉砂岩进行改良时,碴土含水率应控制在16%~30%,碴土的FIR值取20%~35%;土舱中碴土的FIR计算值与FIR实际值存在一定的区别,需对碴土的FIR理论计算值进行修正,修正系数取0.59~0.76。

英文摘要：

Since the ground in the Najing area consists of an argillaceous sihstone formation with high contents of clay minerals, soil conditioning tests were carried out based on the shield tunnelling of Najing Metro Line 1, and a correction factor of FIR was determined by the contrastive analysis of laboratory soil tests and field soil tests. The results show that the moisture content of the soil shall be controlled within 16%~30%, and 20%-35% for the FIR value when the foaming agent is used to improve the argillaceous sihstone, and there are differences between the calculated FIR value and the actual FIR value of the soil in the earth chamber, therefore the theoretical FIR value of the soil shall be corrected with the correction factor of 0.59-0.76.