Subgrade bedding is a key element of railway structure in stability and durability, and it is almost made of soil cement. The dielectric constant, compaction and curing ages of soil cement with different moisture contents were measured. The relation among curing ages, moisture content, compaction of soil cement and electromagnetic features was analyzed. The model of layered soil cement was established to simulate ground-penetrating radar (GPR) electromagnetic waves in the soil cement. The variation rules of dielectric constant and amplitude of radar signals were obtained. The electromagnetic features, i.e. velocity, frequency and amplitude, were analyzed. Ground-penetrating radar was used to detect the railway subgrade soil layer. Based on the center line of the subgrade, there were nine detection lines for every 1[Formula: see text]m to detect the density and smoothness of the subgrade soil layer. Based on the radar wave events and reflected waves, the subgrade condition can be judged.

中文翻译：

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水泥土中探地雷达信号的模拟与试验

路基垫层是铁路结构稳定性和耐久性的关键要素，几乎由水泥土制成。测量了不同含水量的水泥土的介电常数、压实和养护年龄。分析了养护龄期、含水率、水泥土压实度和电磁特性之间的关系。建立层状水泥土模型，模拟水泥土中的探地雷达（GPR）电磁波。得到了雷达信号介电常数和幅值的变化规律。分析了电磁特征，即速度、频率和幅度。采用探地雷达探测铁路路基土层。以路基中心线为基准，每1有9条探测线[公式：见正文]m检测路基土层的密度和光滑度。根据雷达波事件和反射波，可以判断路基状况。