针对软土地层中压入式沉井的下沉稳定性控制问题，依托温州沉井式地下车库工程以压入式沉井法施工的超深地下车库，采用现场实测，研究压入式沉井下沉过程中的刃脚踏面端阻、斜面端阻以及整体端阻力在下沉阻力中占比的变化特征，分析静压下沉与井内取土2个主要工序对端阻力的影响规律并与规范理论值进行对比。研究结果表明： 1）压入下沉的方式对孔隙水压力影响较小，孔隙水压力受到刃脚穿越地层性质影响显著，且主要集中在静压前期； 2）踏面压力与静压力大小呈正相关关系，且井内土塞高度越大，踏面压力受静压力影响越明显； 3）斜面压力随静压下沉呈增大趋势，斜面压力受土塞高度影响较大，刃脚掏空阶段斜面压力将显著下降，当土芯率位于区间0.47~0.69时，下沉姿态对斜面压力的影响较大； 4）踏面压力与斜面压力竖向上的差值基本保持在5~20 kPa，受下沉深度影响较小，通过压力差值曲线可对沉井工况和状态进行初步判断； 5）端阻力随下沉深度呈先增大后稳定趋势，增幅主要集中在地层交界面附近，同规范计算值基本吻合，端阻力随深度分布值受静压及取土工序影响较小，但数值上普遍小于规范值。

 To control the stability of sinking of pressin caisson in soft soil layer, a case study is conducted on an ultradeep underground garage constructed by pressin caisson method in Wenzhou. The change characteristics of tread pressure, slope pressure and ratio of end resistance to total resistance during the sinking process of pressin caisson are studied by field measurement. The effects of two main processes of static pressure sinking and soil extraction on the end resistance are analyzed and compared with the standard theoretical values. The results show the following: (1) The pressingsinking has little effect on the pore water pressure, and the pore water pressure is significantly affected by the properties of the formation beneath the foot blade, which is mainly concentrated in the early stage of static pressure. (2) There is a positive correlation between tread pressure and static pressure. Moreover, the influence of static pressure on tread pressure becomes more pronounced with increasing height of the soil plug in the well. (3) The slope pressure increases with the static pressure. It is greatly affected by soil plug height and decreases with the soil beneath blade foot hollowed. When the soil core rate is in the range of 0.47－0.69, the sinking attitude has a great influence on the slope pressure. (4) The vertical difference between the tread pressure and the slope pressure is basically kept within 5－20 kPa, which is minimally affected by the sinking depth. The working condition and state of caisson can be preliminarily judged by the pressure difference curve. (5) The end resistance increases first and then becomes stable with the sinking depth, and the increase is mainly concentrated near the formation interface, which is basically consistent with the standard calculation value. The distribution value of end resistance with depth is less affected by static pressing and soil extraction, but the value is generally lower than the standard value.