中文摘要：

简要总结国内外既有公路路基的主要工程病害及类型，着重归纳总结目前国内外常用的既有公路路基工程检测方法．并分析各类方法的技术原理、适用范围以及优缺点等技术特点。结合江苏沿海高速公路既有路基处治工程实例，详细分析了钻探取芯有损检测方法和地质雷达无损检测方法的应用及其对工程处治效果评价的作用，结果表明：地质雷达法应用于垂直注浆检测，对成桩边界可以清晰判别：路基钻探取芯检测可以直观定量地反映路基液塑限、密度、干密度、含水量等指标，在局部勘察方面具有明显的优势。

英文摘要：

The main engineering diseases and types of damage to road subgrade in China and abroad are briefly introduced, and the most commonly used detection methods are summarized. The principles, ranges of application, and advantages and disadvantages of these detection methods are comparatively analyzed. In combination with subgrade treatment of the Jiangsu coastal highway, applications of the core drilling detection method, which may cause damage, and the geological radar detection method, which does not cause damage, are analyzed in detail, and the effects of the two methods for subgrade treatments are also evaluated. The results show that the geological radar method can be used in grouting tests in the vertical direction, and the pile boundary can be clearly distinguished. They also show that the core drilling method can reflect indices of the plastic-liquid limit, density, dry density, and water content of road subgrade quantitatively and intuitively, and has obvious advantages in local surveying.