以郑州地铁2号线北环路站—东风路站区间盾构隧道工程为实例，将旋喷桩浆液调整为惰性膨润土浆液，利用旋喷桩高压浆液、高压风切削及填充土体作用，在工程中进行实施印证，成功解决在富水粉细砂层中盾构刀盘卡刀问题。研究表明： 1）将旋喷桩浆液改为惰性膨润土浆液，一方面可以有效切削束缚附着在盾构刀盘上及周边的砂土；另一方面可以对刀盘周边砂层进行填充改良、增加孔隙率、疏松砂层，减小地层对盾构的束缚力。2）膨润土旋喷桩技术，是一种地面非开挖技术，可有效降低采用洞内开舱及地面开槽（挖竖井）等脱困方式的安全风险，具有较高的功效及安全性。3）该技术较适用于软土地层（特别是砂层），根据其原理，不仅可以解决卡刀盘问题，还可以解决盾构盾壳抱死等问题。

During the boring of the running tunnel from Beihuanlu station to Dongfenglu station on Line 2 of Zhengzhou Metro, the cutterhead of the shield is jammed in waterrich fine silty sand strata. Jet grouting with inertia bentonite slurry is carried out to rescue the jammed shield. In the end, the jammed cutterhead is rescued successfully. Conclusions drawn are as follows: 1) On the one hand, the inertia bentonite slurry can cut off the sandy soils on the cutterhead; on the other hand, it can fill and condition the sandy strata around the cutterhead, and in turn can reduce the ground stress on the cutterhead; 2) Due to the application of the jet grouting technology, the rescue of the jammed cutterhead is more efficient and more safe; 3) The mentioned technology is applicable to soft soil strata; 4) The mentioned technology can not only rescue the jammed cutterhead, but also can rescue the jammed shield shell. 