土压平衡盾构在泥质粉砂岩地层中掘进时，因基岩裂隙水发育程度差异性大，易出现螺旋输送机喷涌、渣土流塑性状态差等问题，为确保顺利施工，须进行渣土改良。依托金华—义乌—东阳市域轨道交通金华站—双溪西路站盾构区间工程，室内模拟正常涌水和大量涌水2种工况的渣土状态，添加不同改良剂并开展坍落度试验，研究改良渣土的流塑性。结果表明： 1）为达到渣土坍落度10～20 cm的理想改良要求，正常涌水段加水量占土体积比为40%～46.3%，此时渣土含水率为27.8%～30.6%，与坍落度线性相关； 2）大量涌水段，膨润土或生石灰加入量占土体积比分别为5.5%～6.8%和5%～6.9%。现场验证试验表明，大量涌水段加入相应比例的膨润土或生石灰后，渣土稠度状态得到有效改善，螺旋输送机喷涌问题得以有效控制。

When earth pressure balance(EPB) shield tunneling in argillaceous siltstone strata, muck and water gushing of screw conveyor and poor soil plasticity state are often encountered due to the various development degrees of bedrock fissure water. As a result, soil conditioning should be conducted. A laboratory test is conducted on a shield section of Jinhua station to Shuangxi West Road stastion of JinhuaYiwuDongyang urban rail transit under conditions of normal and large amount of water gushing. Various soil conditioning materials are used to carried out slump test to study the plastic fluidity of improved soil. The results show the following: (1) To reach an ideal soil slump of 10~20 cm, the volume ratio of water added to soil is 40%~46.3% in normal water gushing section, and the soil moisture content is 27.8%~30.6%, which is linearly correlated with the slump. (2) In the section with large amount of water gushing, the ratio of bentonite or quicklime to soil volume is 5.5%~6.8% or 5%~6.9%, respectively. The field test results indicate that after adding bentonite or quicklime in the section with large amount of water gushing, the soil consistency can be effectively improved and the mud and water gushing of screw conveyor can be effectively controlled.