南京长江隧道盾构刀具设计改进及工程应用研究

在建南京长江盾构隧道区间总长约2900m，双洞双线六车道设计，区间主要为粉细砂和砾砂地层，原刀具设计为一次掘进中途不换刀，但实际施工过程中刀具磨损失效严重。针对南京长江隧道原装刀具失效现状，从地质、刀具布置、选材、工艺等方面对失效原因进行了全面分析，在此基础设计了刀具改进方案：加大刀刃硬质合金断面尺寸和单块合金宽度，改进焊接工艺，优化掘进工作参数。工程实践表明：新改进刀具完全适应当前地质条件，换刀距离由改进前不足50环（100m）提高到普遍超过300环（600m），工程经济效益明显。

Study of Improving the Design of and Engineering Application of TBM Tools to the Nanjing Yangtze River Tunnel

The Nanjing Yangtze River Tunnel under construction is about 2900 m in chainage,with bidirectional six lanes in two tunnels in design.The section mainly involves fine sand and gravel in geology.The originally designed cutting tool for the tunnel is a once-and-for-all one,without the needs of replacing it midway.However,the cutting tools suffered from serious wear failures during the practical construction.An all-round analysis is made in the paper of the status quo of failures happening to the original tool...