大直径泥水盾构常压刀盘温度在线监测系统设计与应用———以杭州望江路过江隧道工程为例

在盾构施工过程中,刀盘温度的异常升高会导致刀盘磨损加剧,甚至造成刀盘变形,严重影响盾构施工及安全。为了实时监测盾构刀盘温度,避免刀盘温度过高所带来的危害,以杭州市望江路过江隧道工程为依托,建立一套大直径泥水盾构常压刀盘温度在线监测系统,结合无线传输技术,利用安装在刀盘背面的传感器收集刀盘温度数据,并对数据进行整理和分析。结果表明: 1)该系统能避免信号屏蔽和泥水盾构掘进的干扰,长时间稳定监测刀盘温度; 2)盾构单环掘进时,刀盘温度呈周期性变化,与盾构工作流程相匹配; 3)盾构连续掘进时,掘进产生的热量会在刀盘上稳定积累,使得刀盘温度曲线的峰值持续升高; 4)在刀盘温度异常升高时,通过向刀盘注入分散剂,并观察刀盘温度变化,可以对刀盘形成泥饼和前方地质突变2 种情况进行区分。本文设计的刀盘温度在线监测系统可以用于分析刀盘情况、判断地质变化和调节掘进参数。

Design and Application of Online Temperature Monitoring System forCutterhead of Large-diameter Slurry Shield under Atmospheric Pressure:a Case Study on Wangjiang Road River-crossing Tunnel Project in Hangzhou

In the process of shield tunneling, the abnormal increase of cutterhead temperature will lead to the increase ofcutterhead wear and even cutterhead deformation, which would seriously affects shield tunneling and construction safety.In order to realize real-time monitoring of cutterhead temperature and avoid the harm caused by overlarge cutterheadtemperature, an online cutterhead temperature monitoring system for large-diameter slurry shield used in Wangjiang RoadRiver-crossing Tunnel Project in Hangzhou is established. The monitoring system, combined with wireless transmissiontechnology, uses sensors installed on the back of the cutterhead to collect temperature data, and organizes and analyzesthe data. The results show that: (1) The system can avoid the interference of signal shielding and slurry shieldtunneling, and monitor the cutterhead temperature stably for a long time. (2) In a single tunneling ring, the cutterheadtemperature changes periodically and matches with the working flow of shield tunneling. (3) During continuoustunneling, the heat generated by tunneling will accumulate steadily on the cutterhead, which makes the peak value ofcutterhead temperature curve continuously increase. (4) When the temperature of the cutterhead is abnormallyincreased, by injecting a dispersant into the cutterhead and observing the temperature change of the cutterhead, the conditions such as the mud cake on cutterhead and the geological mutation in front of cutterhead can be distinguished.The online monitoring system of cutterhead temperature mentioned-above can be used to analyze cutterhead conditions,judge geological changes and adjust driving parameters.