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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 method and evaluation system of grouting effect at the bottom of immersed tunnel, the grouting foundation of the Shenjiamen Port subsea tunnel model of Zhoushan was firstly tested with ground penetrating radar and digital seismometer in China. Through the field test before grouting, during grouting and 2 hours after the completion of grouting, the waveform of radar and surface wave collected are compared with the observed results of the observation window set in advance in the model to confirm the grouting Before the grouting process, grouting three waveforms after the completion of the typical, in order to determine and evaluate the bottom of the tunnel immersed grouting effect. The test results show that the method of GPR combined with surface wave method can be used as one of the stopping grouting conditions in pipe bottom grouting construction to monitor and evaluate the foundation grouting effect of immersed tunnel construction on site, Which can provide the basis for engineering design of immersed tunnel.