依托北京南水北调工程团九二期泥水盾构隧道工程,针对北京西山东侧山前斜坡带典型地质特征,将地层分为砂卵石地层Ⅰ、砂卵石夹黏土地层、砂卵石地层Ⅱ、断层破碎带、全断面硬岩和含砾黏土6种地层,统计了区间1 409环的总推力、刀盘扭矩、推进速度、刀盘转速、贯入度、上切口压力6个核心参数的中位数,分布特征和地层的区分度。结果表明:不同地层掘进速度上区分度较好,总推力的区分度较低,散体地层扭矩高于连续体地层;稳定性好的地层刀盘转速大于稳定性差的地层,提高约25%;含砾黏土层和全断面硬岩地层的贯入度较小,低于6 mm;稳定性好的地层在同埋深地层中切口压力小;贯入度符合正态分布程度总体较好,总推力符合程度一般,其他参数较差;将盾构推力和扭矩进行标准化处理,砂卵石地层的推力值和扭矩值分布区间范围最为集中,含砾黏土次之;全断面硬岩的推力值和砂卵石夹黏土地层的扭矩值分散;标准化处理后的推力和扭矩线性拟合系数R²均大于0.89,不同地层的斜率值在1.87×10^-2~5.47×10^-2之间,数值在同一数量级且有明显的区分度。

Based on the slurry shield tunnel project of the Phase II Tuancheng Lake-Jiuxianqiao Project in Beijing's South-to-North Water Diversion, and targeting the typical geological characteristics of the piedmont slope zone on the east side of the Western Hills of Beijing, the strata were divided into six types: gravel-cobble stratum I, gravel-cobble stratum with clay interbeds, gravel-cobble stratum II, fault fracture zone, full-face hard rock, and clay with gravel. Statistical analysis was conducted on the median values, distribution characteristics, and stratigraphic differentiation of six key parameters (total thrust, cutterhead torque, advance rate, cutterhead rotation speed, penetration per revolution, and chamber pressure) from 1409 tunnel rings. The results indicate that: The advance rate shows good stratigraphic differentiation while the total thrust exhibits poor differentiation, and the torque of discrete strata is higher than that of continuous strata; The cutterhead rotation speed in strata with good stability is approximately 25% higher than that in strata with poor stability; The penetration per revolution in clay with gravel and Full-face hard rock strata is relatively small, below 6 mm; Strata with good stability have lower chamber pressure under the same burial depth; The penetration per revolution shows generally good compliance with the normal distribution, the total thrust has moderate compliance, and other parameters perform poorly; After normalizing the shield thrust and torque parameters, the distribution ranges of thrust and torque values in gravel-cobble strata are the most concentrated, followed by clay with gravel; the thrust values of full-face hard rock and the torque values of gravel-cobble stratum with clay interbeds are dispersed; the linear fitting coefficients (R²) of the normalized thrust-torque relationships are all greater than 0.89 for different strata, and the slope values range from 1.87×10^-2 to 5.47×10^-2, which are of the same order of magnitude with obvious differentiation between different strata types.