千岛湖配水工程隧洞岩层以石英质量分数高、浅埋且存在多条断层的砂岩及石英砂岩为主，Ⅳ类围岩占比52%，工期紧，对TBM掘进速度要求高。基于此类特殊条件，结合TBM的特点对千岛湖配水工程进行TBM选型和针对性设计。通过比选最终选用双护盾TBM，刀盘采用高强度箱体结构设计，滚刀采用非线性方式布置，并对刀间距和出渣口进行优化设计；采用控制刀盘暴露长度、增强刀盘扩挖能力、主驱动抬升设计、大转矩大推力设计等方式应对Ⅳ类破碎围岩及断层；并对小洞径TBM物流运输平台进行优化。工程实践结果表明: 该TBM 刀盘设计可靠性强且能保证高效破岩，总体完好率达97%，并创下92 d掘进3 151.58 m的施工纪录，TBM 在Ⅳ类破碎围岩及断层带高效快速通过，各系统运行情况良好。

The main strata in Qiandao Lake water distribution project are sandstone and quartz sandstone with high quartz content, shallow overburden and multiple faults, among which grade Ⅳ surrounding rock accounted for 52%. The construction period of the project is tight, and the demand for tunnel boring machine(TBM) advance rate is high. Based on such special geological conditions, the TBM selection and targeted design are conducted for Qiandao Lake water distribution project. The doubleshield TBM is adopted, the cutterhead is designed with highstrength box structure, the disc cutters are arranged in nonlinear way, and the cutter spacing and muck outlet are optimized. By controlling the exposed length of cutterhead, enhancing the ability of cutterhead to expand, adopting main drive lifting design, large torque and large thrust design, the grade Ⅳ broken surrounding rock and fault can be driven. The smallhole diameter TBM logistics and transportation platform is optimized. The engineering practice results show that the TBM cutterhead design has high reliability and can guarantee efficient rockbreaking performance. The overall perfectness ratio is up to 97% and the machine advanced 3151.58 m in 92 days. Additionally, the TBM has successfully advanced through grade Ⅳ fractured rock and faults effectively and quickly with all systems running in favorable conditions.