既有线路基提速改造健康状态综合评价方法  

Comprehensive Assessment Method for Health Status of Subgrade in Existing Line Speed-Raising Reconstruction

作　　者：方焘[1,2] 刘新荣[1,3] 耿大新[2] 刁心宏[2] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]华东交通大学土木建筑学院,江西南昌330013 [3]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处：《西南交通大学学报》2012年第4期591-596,共6页Journal of Southwest Jiaotong University

基　　金：国家青年基金资助项目(50908086);教育部"新世纪优秀人才支持计划"资助项目(NCET-05-0763);江西省教育厅科技计划资助项目(GJJ09220)

摘　　要：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.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 proved to be reliable, and the test results by it can be directly applied to the design scheme of subgrade reconstruction. This method is of the technical

关 键 词：路基 提速改造 健康状态 综合评价 

分 类 号：U213.1[交通运输工程—道路与铁道工程]