隧道壁后注浆体的探地雷达探测模拟试验研究

Research on the Simulation Examination About GPR Detection of Grouting Material Behind Shield Tunnel Segment

针对现阶段软土盾构隧道壁后注浆施工过程中存在的问题,通过对隧道管片后的探地雷达探测目标体的模拟试验研究,充分展示了隧道壁后充填“探测对象”时电磁波的传播规律。结合室内实体管片壁后注浆体和砂层的探地雷达无损探测模拟试验的研究成果,和基于射线追踪原理的GPR数据二维正演结果,对隧道壁后注浆体的分布形态进行了准确的识别。结果表明:隧道壁后注浆材料的期龄,分布形态对GPR探测的剖面图具有显著的影响。试验对探地雷达准确探测和解释盾构隧道盾尾壁后注浆效果具有十分重要的作用。

In recent years, there are some problems in the grouting behind the lining of shield tunnel. In this paper, in case of some detected objects in the gap behind shield tonnel segments, the propagation rule of the electromagnetic wave has been summed up through a lot of simulation examinations about GPR （ Ground Penetrating Radar ） detection of grouting material behind shield tonnel segments. Combining simulation examination results with two-dimension direct-dedueetion resuits based on radial tracing theory, the distribution of the grouting material can be identified accurately. This study shows that the profile of GPR detection can be affected evidently by three factors the curing period, distribution of gaps and the grouting material. Meanwhile, this simulation examination is important to interpret grouting effect behind shield tunnel segments more perfectly for GPR.