To deal with the speed-raising reconstruction for an existing railway line, the health status of the subgrade of the line need to be assessed first. On the basis of a field investigation of the subgrade damage, the subgrade was divided into 24 segments to be tested according to the severity of subgrade damage, filling material, and the structure of subgrade bed. A total of 754 groups of compaction tests, 345 groups of dynamic elastic modulus tests, and 1 311 groups of light dynamic penetration tests on different positions were conducted, and the test results were analyzed- The analysis indicates that the comprehensive assessment method for health status of subgrade, which combines light dynamic penetration and compaction tests with dynamic elastic modulus tests based on a field investigation, can adequately reflect the strength, rigidity, and durability of subgrade. This method is proved to be reliable, and the test results by it can be directly applied to the design of the technical scheme of subgrade reconstruction.%为了对既有线路提速改造,需要对其路基健康状态进行评价.在现场调查路基健康状态的基础上,按路基病害轻重程度、填料类型与基床结构的不同,将路基区划分为24个检测段,共开展754组密实度、345组动弹性模量和1 311个不同部位轻型动力触探试验,并进行综合分析.分析结果表明:以现场调查为基础,采用轻型动力触探、密实度、动弹性模量相结合的既有线路基健康状态综合评价方法,能全面反映路基强度、刚度、耐久性的状态,是既有线路基健康状态评价的可靠方法之一,试验结果可直接应用于路基工程改造技术方案的设计.
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