为解决大直径泥水盾构在青岛胶州湾第二海底隧道工程中遭遇的高黏性地层泥渣滞排难题，提出并评估一种短螺旋输送机辅助排渣方案。采用计算流体动力学与离散元法（CFD-DEM）耦合的数值模拟方法，建立包含刀盘、泥水舱及排浆系统的1∶1全尺寸模型，将JKR接触模型作为等效数值工具，通过室内黏附剪切试验数据标定表面能参数，以准确再现含水黏土颗粒间的宏观黏附与团聚行为。通过设置含短螺旋输送机的试验组与传统结构的对照组，系统对比分析2种方案在流场特性、颗粒运移、排渣效率及能耗等方面的差异。结果表明： 1）短螺旋输送机显著改善了泥水舱内的流场均匀性，流速标准差由0.82 m/s降至0.47 m/s，有效缓解了局部滞流。2）颗粒滞留现象得到根本性改善，舱内颗粒滞留比例由对照组的30%~40%大幅降至约10%。3）排渣模式由间歇性转变为连续稳定，试验组在启动90 s后排渣效率迅速提升并稳定在约250.00 kg/s、接近258.00 kg/s的理论掘进排渣率，180 s内累计排渣量较对照组提高了238%。4）尽管启动初期能耗略增，但系统稳定运行后（2 min）总能耗显著降低，在3 min循环周期内，综合能耗降低了12.8%。

Muck retention during large-diameter slurry shield tunneling in the high-viscosity strata of the Jiaozhou Bay second subsea tunnel in Qingdao, China poses a major challenge. Hence, a muck-discharge solution assisted by a short-screw conveyor is proposed and evaluated. A coupled computational fluid dynamics and discrete element method (CFD-DEM) is used to establish a 1:1 full-scale model including the cutterhead, slurry chamber, and discharge system. The Johnson-Kendall-Roberts contact model serves as an equivalent numerical tool, and its surface energy parameter is calibrated using indoor adhesion shear test data to accurately reproduce the macroscopic adhesion and agglomeration behavior of wet clay particles. By setting up an experimental group with a short-screw conveyor and a control group with the traditional structure, the differences in flow-field characteristics, particle migration, discharge efficiency, and energy consumption between the two configurations are systematically compared. The results show that: (1) The short-screw conveyor considerably improves the uniformity of the flow field in the slurry chamber, reducing the standard deviation of the velocity from 0.82 to 0.47 m/s and effectively mitigating local flow stagnation. (2) The particle retention phenomenon is fundamentally improved, with the particle retention ratio in the chamber decreasing from 30%－40% in the control group to ~10%. (3) The discharge mode changes from intermittent to continuous and stable; the discharge rate of the experimental group increases rapidly after 90 s of operation and stabilizes at approximately 250.00 kg/s, approaching the theoretical excavation rate of 258.00 kg/s, and the cumulative muck discharged within 180 s is 238% higher than that of the control group. (4) Although the initial energy consumption increases slightly, the total energy consumption decreases significantly after the system stabilizes (after 2 min), with an overall energy saving of 12.8% within a 3-min cycle.