北京市2013年度重点科技研究项目No.C13L00010;甘肃省2014年度科技研究与开发项目No.C14L01060;铁道部重点项目No.C10L00650.This work was supported by the Key Science and Technology Research Project of Beijing in 2013C13L00010,the Science and Technology Research and Development Project of Gansu Province in 2014 C14L01060 and the Key Science and Technology Project of Railway Ministry C10L00650.