无砟轨道铁路路基变形模量E_(v2)控制指标的试验研究  

Experimental Research on the Control Index of Strain Modulus E_(v2) for the Ballastless Track Subgrade

作　　者：胡在良[1] 李晋平[1] 王军东[1] 孟军涛[1] 熊昌盛[1] 

机构地区：[1]中国铁道科学研究院铁道建筑研究所,北京100081

出　　处：《中国铁道科学》2008年第5期20-24,共5页China Railway Science

摘　　要：根据京津城际轨道交通工程路基测试数据,对不同压实条件下碎石类土及级配碎石路基Ev2控制指标进行试验研究。抽取422组测试数据进行统计,分析Ev2及Ev2/Ev1的分布规律及其对路基压实质量的反映程度。对其中93组级配碎石路基Ev2测试数据进行K30分析比对。结果表明,路基压实质量与Ev2/Ev1值的相关性很大,对于不掺水泥的碎石类土填料,Ev2/Ev1较大时,K30,Evd容易出现不合格;对于掺3%-5%水泥的级配碎石填料,Ev2与Ev2/Ev1值离散性偏大,但Ev2/Ev1值较大时,K30测试值偏小。从Ev2多次加载曲线及现场实测不合格点测试结果也可以发现,采用Ev2及Ev2/Ev1双重指标对路基压实质量控制更为有效。Based on the tested data of Ev2 on the ballastless track subgrade of Beiiing-Tianiin inter-city rail transit project, the control index of strain modulus Ev2 is studied for the gravel filling material under different compaction conditions. In order to obtain the distribution rule of Ev2 and Ev2/Evl and their reflection degree on the construction quality of railway subgrade, 422 sets of tested data are selected to make statistical analyses. The sampled 93 sets of graded broken stone Fv2 are analyzed and compared with K30. Such conclusions can be made that, firstly, there is close pertinence between the value of Ev2/Ev1 and the subgrade compaction quality. Secondly, for the graded broken stone without mixing cement, the parallel tested data of K30 and Evd is easy to be unqualified if Ev2/Ev1 is larger. For the graded broken stone mixing 3% --5% cement, the distribution of Evz and Ev2/Ev1 is discrete. But the tested data of K30 is small when the value of Ev2/Ev1 is larger. Finally, from Ev2 multiple loading curve and the test results of unqualified points in field tests, it is found more effective to control the subgrade compaction quality by adopting double-index Ev2 and Ev2/Ev1.

关 键 词：无砟轨道 路基 变形模量EV2 控制指标 

分 类 号：U213.1[交通运输工程—道路与铁道工程]