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利用探地雷达方法探测盾构隧道壁后注浆注浆分布效果时,盾构管片壁后介质中的电磁波速的确定,是保证探测精度和图形识别的关键技术之一。运用网络分析仪同轴探头法对上海盾构隧道所穿越地层(第三层～第七层)的原状土样进行了介电常数测试实验和含水率实验,得到了这些土样含水率和其在测试频率为0.02～2.0GHz范围内的介电常数,通过计算得到了电磁波在这些土体中的传播速度,分析了其与含水率之间的关系以及随地层深度的变化趋势,为今后探地雷达用于上海地区盾构隧道壁后注浆效果的探测提供了重要的依据。
When using ground penetrating radar to detect the grouting grouting effect of shield tunnel wall, the determination of the electromagnetic wave velocity in the back wall of shield tunnel is one of the key technologies to ensure the detection accuracy and pattern recognition. Coaxial probe method of network analyzer was used to test the dielectric constant and moisture content of the undisturbed soil samples of the strata (the third layer to the seventh layer) traversed by the shield tunnel in Shanghai. The water content of these samples In the test frequency of 0.02 ~ 2.0GHz range of dielectric constant, calculated by the electromagnetic wave propagation speed in these soils, analyzed the relationship between moisture content and with the trend of changes in the depth of the ground for future exploration Ground radar for the shield tunnel in Shanghai to detect the effect of the wall to provide an important basis.