沉管隧道注浆效果监测与评价的试验研究

Test Study on Monitoring and Evaluation of Grouting Effect in the Immersed Tube Tunnel

为了探索沉管隧道管底注浆效果的监测方法和评价体系,在国内率先采用探地雷达和数字地震仪对舟山沈家门港海底隧道模型的注浆基础进行了测试研究。通过在注浆前、注浆过程中以及注浆完成2小时后所进行的现场检测,将采集到雷达波形和面波波形与模型中预先设置的观察窗现场观察的结果进行对比,确定注浆前、注浆过程中、注浆完成后三个阶段的典型波形,以判别和评价沉管隧道管底注浆基础效果。试验结果表明,探地雷达结合面波法的监测方法能作为在管底注浆施工时的停止注浆条件之一,可满足沉管隧道现场施工时管底注浆基础效果的监测和评价,进而可为沉管隧道的工程设计方案提供依据。

In order to explore the monitoring methods and evaluation system of the immersed tube tunnel grouting effect, the grouting foundation of Shenjiamen port cross-harbour tunnel model has been tested firstly using ground penetrating radar and digital seismograph in Zhoushan, Zhejiang, China. By field testing before grouting, during grouting process and 2 hours after grouting, the collected waveforms by ground penetrating radar and surface wave have been compared with the results of field observations in pre-set viewing window. The typical waveforms of three phases（before grouting, in grouting process and after grouting ） would be determined, which have been to differentiate and evaluate the foundation grouting effect of the immersed tube tunnel. The test results showed that the monitoring method combining ground penetrating radar and surface wave eould be used as one of the conditions to stop grouting in the construetion of the tube bottom and could meet the monitoring and evaluation of the foundation grouting effect in the immersed tube tunnel construction site. This method will also provide the basis for engineering design programs of the immersed tube tunnel.